CN113866355B - Simulation experiment method for water rock action and nuclide migration in multiple barriers of treatment library - Google Patents

Simulation experiment method for water rock action and nuclide migration in multiple barriers of treatment library Download PDF

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CN113866355B
CN113866355B CN202111068991.3A CN202111068991A CN113866355B CN 113866355 B CN113866355 B CN 113866355B CN 202111068991 A CN202111068991 A CN 202111068991A CN 113866355 B CN113866355 B CN 113866355B
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water
nuclide
medium
action
bentonite
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CN113866355A (en
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臧建正
陈洁
江国润
徐辉
王卫宪
姚海波
刘艳
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63653 Troops of PLA
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63653 Troops of PLA
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/38—Concrete; ceramics; glass; bricks
    • G01N33/383—Concrete, cement
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/40—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for geology
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/30—Assessment of water resources

Abstract

The invention discloses a simulation experiment method for water rock action and nuclide migration in a multiple barrier of a treatment warehouse, and in one aspect, the invention provides a simulation experiment device for water rock action and nuclide migration in the multiple barrier of the treatment warehouse, which comprises a groundwater and granite medium water rock action simulation unit, a groundwater and bentonite medium water rock action simulation unit and a groundwater and concrete medium water rock action simulation unit; on the other hand, the invention relies on the autonomous designed simulation experiment device for the actions and the nuclides of the multiple barriers of the treatment warehouse, establishes a simulation experiment simulation method for the actions and the nuclides of the multiple barriers of the treatment warehouse, can realize continuous water rock action experiment simulation of underground water and multiple barrier media and dynamic monitoring of chemical component change of the underground water, and can also realize dynamic migration experiment simulation of nuclides in the multiple barrier media under the action of a groundwater carrier band, thereby providing a powerful technical means for evaluating the multiple barrier structures of the treatment warehouse for a long time.

Description

Simulation experiment method for water rock action and nuclide migration in multiple barriers of treatment library
Technical Field
The invention relates to the field of radioactive waste disposal safety evaluation research, in particular to a simulation experiment method for the actions of water and rock and nuclides migration in multiple barriers of a disposal warehouse.
Background
The nuclear industry activities generate a large amount of radioactive waste, which is classified into high-level waste, medium-low-level waste, extremely-low-level waste, etc., according to the classification method of the international atomic energy agency, wherein the disposal of the high-level waste has been an important research content of international society. It is widely recognized internationally that deep geological disposal of high level waste with multiple barrier structures including an artificial barrier of intact granite natural barrier, bentonite and cement solidified body is the most feasible disposal method, mainly by means of low permeability and strong chemical properties of granite medium, low permeability and strong adsorptivity of bentonite barrier layer, alkaline precipitation reaction of cement and hardening encapsulation process, under the synergistic effect of the above barrier layers, blocking water flow and nuclide migration.
According to the international atomic energy structure requirements, the safety period of high-level waste disposal is in the time scale of tens of thousands of years. However, within this time limit, the complete granite natural barrier may develop a distribution of cracks due to geological effects, and groundwater may pass through the granite crack channels into the artificial barrier structure of bentonite, etc. In general, the groundwater in a radioactive waste disposal area contains high-concentration salt ions, and after the high-concentration salt ions sequentially enter a granite-bentonite-concrete barrier layer, the salt ions contained in the groundwater can exchange with mineral ions in granite, bentonite and concrete for multiple times to act with water and rock, so that the mineral composition and even the structure of the barrier layer are changed, and the permeation blocking performance of the barrier layer and the nuclide release behavior in a cement solidified body are influenced; meanwhile, due to the chemical composition change of the underground water, the outward migration behavior of nuclides from concrete, bentonite and granite in turn can be obviously influenced. Therefore, in order to evaluate the long-term safety of the multiple barrier structure of the high level waste disposal warehouse, it is necessary to develop the water-rock effect of the groundwater after entering the granite, bentonite and concrete, and the experimental study of the migration behavior of the radionuclide in the multiple barrier under such conditions.
At present, the research field mainly comprises static experiments, and the main research method comprises the following steps: the nuclide is mixed with a balance solution containing a single barrier medium, and after standing to reach reaction balance, the nuclide concentration change is sampled and analyzed, and the method is difficult to truly reflect the water-rock action process of underground water and barrier materials and the dynamic migration behavior and rule of the nuclide under the action of dynamic water flow. A small amount of dynamic experimental research only focuses on migration behavior of water flow or nuclide in a single barrier medium, so that multiple reactions between groundwater and a barrier layer are simplified, influence of water-rock action on nuclide migration behavior and mechanism is ignored, changes of groundwater chemical property and nuclide adsorption migration behavior in each process cannot be dynamically monitored in real time, and reliable and effective basic data are difficult to provide for safety evaluation of a disposal warehouse.
In order to solve the problems, the invention is based on the realistic scene of the multi-barrier structure of the disposal warehouse, namely, the continuous circulation migration process of groundwater flowing through granite-bentonite layer-concrete layer in sequence and the migration process of nuclide flowing through concrete layer-bentonite layer-granite barrier layer in sequence under the water body carrier band after the action of water and rock, innovatively designs an experimental device and a flow for simulating the action of water and rock and the dynamic migration of nuclide in the multi-barrier structure, and provides important technical support for obtaining the action of water and the migration rule of nuclide in the realistic scene.
Disclosure of Invention
The invention aims to provide a simulation experiment method for the actions of water and nuclides in multiple barriers of a treatment warehouse, so as to realize the simulation and real-time monitoring of the continuous water and rock action process of underground water and multiple barrier media, and simultaneously realize the simulation of continuous dynamic migration experiment of nuclides in multiple barriers under a water carrier band, thereby providing a technical means for evaluating the long-term safety of the multiple barrier structure of the treatment warehouse.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in one aspect, the invention provides a simulation experiment device for water rock action and nuclide migration in a multiple barrier of a disposal library, which comprises a groundwater and granite medium water rock action simulation unit, a groundwater and bentonite medium water rock action simulation unit, a groundwater and concrete medium water rock action simulation unit, a nuclide in concrete medium dynamic migration simulation unit, a nuclide in bentonite medium dynamic migration simulation unit, a luer connector and an injector, wherein the groundwater and granite medium water rock action simulation unit is communicated with the groundwater and bentonite medium water rock action simulation unit, the groundwater and bentonite medium water rock action simulation unit is communicated with the groundwater and concrete medium water rock action simulation unit, the groundwater and concrete medium water rock action simulation unit is communicated with the nuclide in concrete medium dynamic migration simulation unit through the luer connector, the nuclide in concrete medium dynamic migration simulation unit is communicated with the nuclide in bentonite medium dynamic migration simulation unit, and the nuclide in bentonite medium dynamic migration simulation unit is communicated with the nuclide in the granite medium dynamic migration simulation unit;
The injector is used for containing the radionuclide and quantitatively injecting the radionuclide into the dynamic migration simulation unit of the radionuclide in the concrete medium, the dynamic migration simulation unit of the radionuclide in the bentonite medium and the dynamic migration simulation unit of the radionuclide in the granite medium through the luer connector;
the underground water and granite medium water rock interaction simulation unit, the underground water and bentonite medium water rock interaction simulation unit and the underground water and concrete medium water rock interaction simulation unit are used for simulating interaction between an underground water solution and water rock among different mediums and detecting chemical component changes of the water solution in real time;
the dynamic migration simulation unit of the nuclide in the concrete medium, the dynamic migration simulation unit of the nuclide in the bentonite medium and the dynamic migration simulation unit of the nuclide in the granite medium are used for simulating the dynamic migration process of the radionuclide carried by the underground aqueous solution in different mediums respectively after interaction of water and rock.
As a further scheme of the invention: the underground water and granite medium water rock action simulation unit comprises an underground water tank, a first water sample collection measuring bottle, water and granite action chamber, wherein the underground water tank is communicated with the top of the first water sample collection measuring bottle, a first sampling pipe and a first backflow pipe are arranged at the top of the first water sample collection measuring bottle in a penetrating mode, the water and granite action chamber comprises a first sealing container, two first nylon nets and two first porous water permeable plates are symmetrically arranged on the inner wall of the first sealing container, the two first nylon nets are located on the inner sides of the two first porous water permeable plates, a first sample chamber is formed between the two first nylon nets, a first liquid outlet pipe is arranged at the top of the first sealing container in a penetrating mode, a first liquid inlet pipe and a first backflow pipe are arranged at the bottom of the first sealing container in a penetrating mode, the first liquid inlet pipe is communicated with the bottom of the outer wall of the first water sample collection measuring bottle, and the first liquid outlet pipe is communicated with the first backflow pipe.
As a further scheme of the invention: groundwater and bentonite medium water rock effect analog unit includes second water sample collection measurement bottle, water and bentonite action room, the top of second water sample collection measurement bottle is run through and is provided with second inlet tube, second sampling tube, second back flow, water and bentonite action room includes second seal container, the inner wall symmetry of second seal container is provided with two second nylon nets and two second porous water permeable plates, two the second nylon nets are located the inboard of two second porous water permeable plates, two be formed with the second sample chamber between the second nylon nets, the inside of second seal container is located the top of second sample chamber and is provided with out the liquid funnel, the inside of second seal container is in the top of liquid funnel top liquid collecting chamber, liquid funnel is laminated with corresponding second porous water permeable plates, the outer wall of second seal container is located the both sides symmetry of liquid funnel and runs through and be provided with second drain pipe and third drain pipe, the top of second seal container is run through and is provided with first manometer and second exhaust tube, the bottom of second seal container is located the top liquid collecting chamber, bottom water sample collecting chamber and second exhaust pipe are run through to be provided with second drain pipe and second drain pipe intercommunication.
As a further scheme of the invention: the underground water and concrete medium water rock action simulation unit comprises a third water sample collection measuring bottle and a water and concrete action chamber, the third water sample collection measuring bottle and the second water sample collection measuring bottle are identical in structure, the water and concrete action chamber and the water and bentonite action chamber are identical in structure, a second water inlet pipe of the third water sample collection measuring bottle is communicated with a third liquid outlet pipe of the water and bentonite action chamber, a second liquid outlet pipe of the water and concrete action chamber is communicated with a second return pipe of the third water sample collection measuring bottle, a second liquid inlet pipe of the water and concrete action chamber is communicated with the bottom of the outer wall of the third water sample collection measuring bottle, and a third liquid outlet pipe of the water and concrete action chamber is communicated with a luer connector.
As a further scheme of the invention: the dynamic migration simulation unit of the nuclide in the concrete medium comprises a dynamic migration chamber of the nuclide in the concrete, a first liquid discharge pipe and a first automatic part collector, the internal structure of the dynamic migration chamber of the nuclide in the concrete is identical to that of a water and bentonite acting chamber, a fourth liquid discharge pipe penetrates through the outer wall of a second sealing container in the dynamic migration chamber of the nuclide in the concrete, the fourth liquid discharge pipe is positioned on one side of a corresponding liquid discharge funnel, a third exhaust pipe and a second pressure gauge penetrate through the top of the second sealing container in the dynamic migration chamber of the nuclide in the concrete, a third exhaust pipe and a third liquid inlet pipe penetrate through the bottom of the second sealing container in the dynamic migration chamber of the nuclide in the concrete, the third liquid inlet pipe is communicated with a luer connector, and the water inlet end of the first liquid discharge pipe is communicated with the fourth liquid discharge pipe of the dynamic migration chamber of the nuclide in the concrete, and the water outlet end of the first liquid discharge pipe is communicated with the first automatic part collector.
As a further scheme of the invention: the dynamic migration simulation unit of the nuclide in the bentonite medium comprises a dynamic migration chamber of the nuclide in the bentonite, a second liquid discharge pipe and a second automatic part collector, the structure of the dynamic migration chamber of the nuclide in the bentonite is the same as that of the dynamic migration chamber of the nuclide in the concrete, a third liquid inlet pipe of the dynamic migration chamber of the nuclide in the bentonite is communicated with the dynamic migration simulation unit of the nuclide in the bentonite medium of the dynamic migration chamber of the nuclide in the concrete, a water inlet end of the second liquid discharge pipe is communicated with a fourth liquid outlet pipe of the dynamic migration chamber of the nuclide in the bentonite, and a water outlet end of the second liquid discharge pipe is communicated with the second automatic part collector.
As a further scheme of the invention: the dynamic migration simulation unit of the nuclide in the granite medium comprises a dynamic migration chamber of the nuclide in the granite and a third automatic part collector, the structure of the dynamic migration chamber of the nuclide in the granite is the same as that of the action chamber of water and the granite, a first liquid inlet pipe of the dynamic migration chamber of the nuclide in the granite is communicated with a fourth liquid outlet pipe of the dynamic migration chamber of the nuclide in bentonite, and the first liquid outlet pipe of the dynamic migration chamber of the nuclide in the granite is communicated with the third automatic part collector.
As a further scheme of the invention: the system also comprises a plurality of plug valves, peristaltic pumps and flow regulating needle valves, wherein the plug valves, peristaltic pumps and flow regulating needle valves are arranged on corresponding pipelines in the underground water and granite medium water rock action simulation unit, the underground water and bentonite medium water rock action simulation unit, the underground water and concrete medium water rock action simulation unit, the dynamic migration simulation unit of nuclide in the concrete medium, the dynamic migration simulation unit of nuclide in the bentonite medium and the dynamic migration simulation unit of nuclide in the granite medium, so as to be used for controlling the flow speed, flow and on-off of fluid in each pipeline.
On the other hand, the invention provides a simulation experiment method for the actions and the nuclides of the water rocks in the multiple barriers of the treatment library, which is used for the simulation experiment device for the actions and the nuclides of the water rocks in the multiple barriers of the treatment library, and comprises the following steps:
s1: simulating water-rock interaction between underground water and granite medium, and periodically sampling and detecting aqueous solution: under the action of a peristaltic pump, groundwater is sequentially guided into a water and granite action chamber through a groundwater tank, a first water sample collecting and measuring bottle and a first liquid inlet pipe of the water and granite action chamber, and then guided out through a first liquid outlet pipe of the water and granite action chamber, and part of effluent flows back into the first water sample collecting and measuring bottle through a first backflow pipe under the action of a corresponding flow regulating needle valve and the peristaltic pump so as to be mixed with the groundwater and the original groundwater in a granite medium water rock action simulation unit, so that a first flow cycle is completed, and the groundwater in the first water sample collecting and measuring bottle can be periodically sampled and detected through the first sampling pipe, so that the change rule information of the chemical components of the water after the water and granite action is obtained; the other part of effluent liquid enters a groundwater and bentonite medium water rock action simulation unit through a second water inlet pipe on a second water sample collecting and measuring bottle under the action of a corresponding flow regulating needle valve and a peristaltic pump;
S2: simulating the interaction of water and rock between underground water and bentonite medium, and periodically sampling and detecting the water solution: after groundwater enters a second water sample collection measuring bottle through a second water inlet pipe on the second water sample collection measuring bottle, the groundwater in the second water sample collection measuring bottle is pumped into a water and bentonite action chamber under the action of a corresponding peristaltic pump, and is discharged through a second liquid outlet pipe and a third liquid outlet pipe of the water and bentonite action chamber, the groundwater discharged through the second liquid outlet pipe flows back into the second water sample collection measuring bottle under the action of a corresponding flow regulating needle valve and the peristaltic pump so as to be mixed with the original groundwater in the second water sample collection measuring bottle, the first flow circulation is completed, the groundwater in the second water sample collection measuring bottle can be periodically sampled and detected through a second sampling pipe on the second water sample collection measuring bottle, the change rule information of the chemical components of the water after the water and bentonite are acted is obtained, meanwhile, the mutual influence between the two media water and rock actions can be obtained through the comparison with the change rule information of the chemical components of the water and the water obtained by a water and bentonite medium water and rock action simulation unit, and the flow of the groundwater discharged through the ground water and the third liquid outlet pipe on the action chamber can be regulated by the corresponding needle valve and the corresponding peristaltic pump and the water sample collection measuring unit;
S3: simulating the interaction of the underground water and water rock between the concrete medium, and periodically sampling and detecting the water solution: after the groundwater enters a third water sample collecting and measuring bottle in a groundwater and concrete medium water rock action simulation unit, the groundwater in the third water sample collecting and measuring bottle is pumped into a water and concrete action chamber under the action of a corresponding peristaltic pump, and is discharged from a second liquid outlet pipe and a third liquid outlet pipe of the water and concrete action chamber, the groundwater discharged from the second liquid outlet pipe flows back into the third water sample collecting and measuring bottle under the action of a corresponding flow regulating needle valve and the peristaltic pump so as to be mixed with the original groundwater in the third water sample collecting and measuring bottle, the first flow circulation is completed, the groundwater in the third water sample collecting and measuring bottle can be periodically sampled and detected through a second sampling pipe on the third water sample collecting and measuring bottle, the change rule information of the water chemical components of the water after the water is acted on bentonite is obtained, and the mutual influence between two medium water rock actions can be obtained through the comparison with the change rule information of the water chemical components of the groundwater and the water chemical components obtained by the bentonite medium water rock action simulation unit, and the groundwater discharged from the third liquid outlet pipe on the soil action chamber can enter a luer joint under the action of the corresponding needle valve and the peristaltic pump;
S4: simulating a dynamic migration process of nuclides in a concrete medium under the action of a groundwater carrier band and sampling and analyzing nuclide concentration: injecting a radionuclide-containing solution into a nuclide dynamic migration chamber of a dynamic migration simulation unit of nuclides in a concrete medium through a luer connector by adopting an injector with the capacity of 10mL, introducing groundwater and the groundwater of the dynamic migration simulation unit of the concrete medium into the nuclide dynamic migration chamber of the dynamic migration simulation unit of the nuclides in the concrete medium through a luer connector, starting a dynamic migration process of the nuclides in the concrete medium, pumping out effluent liquid of the nuclides by a corresponding peristaltic pump, enabling one part of effluent liquid to enter a first automatic part collector through a corresponding flow regulating needle valve, sampling at fixed time, and enabling the other part of effluent liquid to enter the nuclide dynamic migration chamber of the dynamic migration simulation unit of the nuclides in the bentonite medium through a corresponding flow regulating needle valve;
s5: simulating a dynamic migration process of nuclides in bentonite media under the action of a groundwater carrier band and sampling and analyzing nuclide concentration: after the effluent containing the radioactive nuclide enters a dynamic migration chamber of the nuclide in bentonite, starting a dynamic migration process of the nuclide in bentonite medium, pumping out the effluent by a corresponding peristaltic pump, enabling one part of the effluent to enter a second automatic part collector through a corresponding flow regulating needle valve, sampling at fixed time, and enabling the other part of the effluent to enter a dynamic migration chamber of the nuclide in granite of a dynamic migration simulating unit of the nuclide in granite medium through a corresponding flow regulating needle valve;
S6: simulating a dynamic migration process of nuclides in granite media under the action of a groundwater carrier band and sampling and analyzing nuclide concentration: after the effluent containing the radionuclide enters the radionuclide in the granite dynamic migration chamber, the radionuclide dynamic migration process in the granite medium is started, and then the effluent is sampled at fixed time by entering a third automatic part collector.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, by means of the autonomously designed simulation experiment device for the actions of the water rock and the nuclide migration in the multiple barriers of the treatment warehouse, a simulation experiment method for the actions of the water rock and the nuclide migration in the multiple barriers of the treatment warehouse is established, continuous water rock action experiment simulation of underground water and multiple barrier mediums and dynamic monitoring of chemical component changes of the underground water can be realized, and meanwhile, dynamic migration experiment simulation of nuclides in the multiple barrier mediums under the action of a ground water carrier belt can be realized, so that a powerful technical means is provided for evaluating the multiple barrier structures of the treatment warehouse for a long time.
Drawings
FIG. 1 is a schematic diagram of a simulation experiment device for the actions of water and rock and nuclides in multiple barriers of a treatment library.
FIG. 2 is a schematic diagram of the structure of a simulation unit of the water-rock action of the groundwater and granite medium in a simulation experiment device for the water-rock action and nuclide migration in multiple barriers of a treatment warehouse.
Fig. 3 is a schematic structural diagram of a groundwater and bentonite medium water rock action simulation unit in a treatment library multiple barrier water rock action and nuclide migration simulation experiment device.
Fig. 4 is a schematic structural diagram of a simulation unit of the actions of water and concrete medium water and rock in a simulation experiment device for actions of water and nuclides in multiple barriers of a treatment warehouse.
FIG. 5 is a schematic diagram of the structure of a dynamic migration simulation unit of nuclides in a concrete medium in a simulation experiment device for the actions of water and nuclides migration in multiple barriers of a treatment warehouse.
Fig. 6 is a schematic structural diagram of a dynamic migration simulation unit of nuclides in bentonite medium in a simulation experiment device for the actions of water and nuclides migration in multiple barriers of a treatment library.
FIG. 7 is a schematic diagram of the structure of a dynamic migration simulation unit of nuclides in granite medium in a simulation experiment apparatus for the actions of water and nuclides migration in multiple barriers of a treatment library.
FIG. 8 is a schematic diagram of the water and granite reaction chamber of the simulated experiment device for water and rock reaction and nuclide migration in multiple barriers of the treatment library.
Fig. 9 is a schematic diagram of the structure of the water and bentonite reaction chamber in the simulated experiment device for the water and nuclide migration in the multiple barriers of the treatment warehouse.
FIG. 10 is a schematic diagram of the structure of a dynamic migration chamber of nuclides in concrete in a simulation experiment device for the actions of water and nuclides in multiple barriers of a treatment warehouse.
Wherein, the liquid crystal display device comprises a liquid crystal display device, the system comprises a groundwater and granite medium water rock action simulation unit 1, a groundwater and bentonite medium water rock action simulation unit 2, a groundwater and concrete medium water rock action simulation unit 3, a nuclide in concrete medium dynamic migration simulation unit 4, a nuclide in bentonite medium dynamic migration simulation unit 5, a nuclide in granite medium dynamic migration simulation unit 6, a luer joint 7, an injector 8, a groundwater tank 9, a first water sample collecting and measuring bottle 10, a first sampling tube 11, a first return tube 12, a water and granite action chamber 13, a second water sample collecting and measuring bottle 14, a second water inlet tube 15, a second sampling tube 16, a second return tube 17, a water and bentonite action chamber 18, a third water sample collecting and measuring bottle 19, a water and concrete action chamber 20, a nuclide in concrete dynamic migration chamber 21, a first liquid discharge tube 22, a first water sample collecting and measuring bottle the first automatic part collector 23, the second liquid discharge pipe 25, the second automatic part collector 26, the dynamic transfer chamber 27, the third automatic part collector 28, the plug valve 29, the peristaltic pump 30, the flow regulating needle valve 31, the first sealed container 32, the first nylon mesh 33, the first porous water permeable plate 34, the first sample chamber 35, the first liquid inlet pipe 36, the first air outlet pipe 37, the first liquid outlet pipe 38, the second sealed container 39, the second nylon mesh 40, the second porous water permeable plate 41, the second sample chamber 42, the liquid outlet funnel 43, the second liquid outlet pipe 44, the third liquid outlet pipe 45, the first pressure gauge 46, the second air outlet pipe 47, the second liquid inlet pipe 48, the second air outlet pipe 49, the fourth liquid outlet pipe 50, the third air outlet pipe 51, the second pressure gauge 52, the third liquid inlet pipe 53 and the third air outlet pipe 54.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 10, in one aspect, the invention provides a simulation experiment device for water rock action and nuclide migration in a multiple barrier of a disposal library, which comprises a groundwater and granite medium water rock action simulation unit 1, a groundwater and bentonite medium water rock action simulation unit 2, a groundwater and concrete medium water rock action simulation unit 3, a dynamic migration simulation unit 4 of nuclide in a concrete medium, a dynamic migration simulation unit 5 of nuclide in a bentonite medium, a dynamic migration simulation unit 6 of nuclide in a granite medium, a luer joint 7 and an injector 8, wherein the groundwater and granite medium water rock action simulation unit 1 is communicated with the groundwater and bentonite medium water rock action simulation unit 2, the groundwater and bentonite medium water rock action simulation unit 2 is communicated with the groundwater and concrete medium water rock action simulation unit 3, the groundwater and concrete medium water rock action simulation unit 3 is communicated with the dynamic migration simulation unit 4 of nuclide in the concrete medium through the luer joint 7, the dynamic migration simulation unit 4 of nuclide in the concrete medium is communicated with the dynamic migration simulation unit 6 of nuclide in the bentonite medium, and the dynamic migration simulation unit 5 of nuclide in the bentonite medium is communicated with the dynamic migration simulation unit 6 in the bentonite medium;
The injector 8 is used for containing the radionuclide and quantitatively injecting the radionuclide into the dynamic migration simulation unit 4 of the radionuclide in the concrete medium, the dynamic migration simulation unit 5 of the radionuclide in the bentonite medium and the dynamic migration simulation unit 6 of the radionuclide in the granite medium through the luer connector 7;
the underground water and granite medium water rock interaction simulation unit 1, the underground water and bentonite medium water rock interaction simulation unit 2 and the underground water and concrete medium water rock interaction simulation unit 3 are used for simulating the interaction of underground water solution and water rock between different mediums and detecting the chemical component change of the water solution in real time;
the dynamic migration simulation unit 4 of the nuclide in the concrete medium, the dynamic migration simulation unit 5 of the nuclide in the bentonite medium and the dynamic migration simulation unit 6 of the nuclide in the granite medium are used for simulating the dynamic migration process of the radionuclide carried by the underground aqueous solution in different mediums after the interaction of water and rock.
The underground water and granite medium water rock action simulation unit 1 comprises an underground water tank 9, a first water sample collection measuring bottle 10 and a water and granite action chamber 13, wherein the underground water tank 9 is communicated with the top of the first water sample collection measuring bottle 10, a first sampling pipe 11 and a first return pipe 12 are arranged on the top of the first water sample collection measuring bottle 10 in a penetrating mode, the water and granite action chamber 13 comprises a first sealing container 32, two first nylon nets 33 and two first porous water permeable plates 34 are symmetrically arranged on the inner wall of the first sealing container 32, the two first nylon nets 33 are located on the inner sides of the two first porous water permeable plates 34, a first sample chamber 35 is formed between the two first nylon nets 33, a first liquid outlet pipe 38 is arranged on the top of the first sealing container 32 in a penetrating mode, a first liquid inlet pipe 36 and a first exhaust pipe 37 are arranged on the bottom of the first sealing container 32 in a penetrating mode, the first liquid inlet pipe 36 is communicated with the bottom of the outer wall of the first water sample collection measuring bottle 10, the first nylon nets 38 and the first return pipe 12 are in the same size as the first porous water permeable plates 34, and the first water permeable plates 300 are arranged on the bottom of the first sealing container. In view of timely evacuation of air from the first sample chamber 35, when liquid enters the first sample chamber 35 from the first liquid inlet pipe 36, the corresponding plug valve 29 is opened to evacuate air from the first air outlet pipe 37, and after the first air outlet pipe 37 is filled with liquid, the plug valve 29 is closed.
The underground water and bentonite medium water rock action simulation unit 2 comprises a second water sample collection measuring bottle 14 and a water and bentonite action chamber 18, a second water inlet pipe 15, a second sampling pipe 16 and a second return pipe 17 are arranged at the top of the second water sample collection measuring bottle 14 in a penetrating mode, the water and bentonite action chamber 18 comprises a second sealing container 39, two second nylon nets 40 and two second porous water permeable plates 41 are symmetrically arranged on the inner wall of the second sealing container 39, the two second nylon nets 40 are located on the inner sides of the two second porous water permeable plates 41, a second sample chamber 42 is formed between the two second nylon nets 40, a liquid outlet funnel 43 is arranged at the upper portion of the second sealing container 39 and located above the second sample chamber 42, an upper porous liquid collecting chamber is formed at the upper portion of the second sealing container 39, the liquid outlet funnel 43 is attached to the corresponding second porous water permeable plates 41, a second liquid outlet pipe 44 and a third liquid outlet pipe 45 are symmetrically arranged on the outer wall of the second sealing container 39 in a penetrating mode, a second liquid outlet pipe 45 and a second liquid outlet pipe 45 are arranged on the outer wall of the second sealing container 39 in a penetrating mode, a second liquid outlet pipe 48 is arranged on the outer wall of the second sealing container 39 and a liquid outlet pipe 48 is arranged on the bottom of the second sealing container 48 in a penetrating mode, a liquid outlet pipe 48 is arranged on the second sealing container 48 is communicated with the top of the second water sample collection chamber, and the second water sample is arranged on the second water sample collection chamber, and the water sample is communicated with the water sample.
Considering that compacted bentonite and concrete have low permeability, the second air extraction pipe 47 is externally connected with a vacuum pump, so that negative pressure is formed inside the upper liquid collecting chamber, and water flow can quickly pass through the second sample chamber 42 after entering from the second liquid inlet pipe 48. To avoid interaction between the liquid outflow and the pumping process in the upper liquid collection chamber, the tank second outlet pipe 44, the first sample chamber 35 is arranged at half the height of the outlet funnel 43 in the upper liquid collection chamber. Meanwhile, considering uniformity of groundwater entering the sample chamber, the apertures of the second nylon mesh 40 and the second porous water permeable plate 41 are 300 meshes. In view of the timely evacuation of air from the sample chamber, when liquid enters the second sample chamber 42 from the second liquid inlet pipe 48, the corresponding plug valve 29 is opened to evacuate air from the second air outlet pipe 49, and after the second air outlet pipe 49 is filled with liquid, the plug valve 29 is closed.
The groundwater and concrete medium water rock action simulation unit 3 comprises a third water sample collection measuring bottle 19 and a water and concrete action chamber 20, the third water sample collection measuring bottle 19 and the second water sample collection measuring bottle 14 are identical in structure, the water and concrete action chamber 20 and the water and bentonite action chamber 18 are identical in structure, a second water inlet pipe 15 of the third water sample collection measuring bottle 19 is communicated with a third liquid outlet pipe 45 of the water and bentonite action chamber 18, a second liquid outlet pipe 44 of the water and concrete action chamber 20 is communicated with a second return pipe 17 of the third water sample collection measuring bottle 19, a second liquid inlet pipe 48 of the water and concrete action chamber 20 is communicated with the bottom of the outer wall of the third water sample collection measuring bottle 19, and a third liquid outlet pipe 45 of the water and concrete action chamber 20 is communicated with the luer joint 7.
The dynamic migration simulation unit 4 of the nuclide in the concrete medium comprises a dynamic migration chamber 21 of the nuclide in the concrete, a first liquid discharge pipe 22 and a first automatic part collector 23, the internal structure of the dynamic migration chamber 21 of the nuclide in the concrete is identical to that of the water and bentonite action chamber 18, a fourth liquid discharge pipe 50 is arranged on the outer wall of a second sealed container 39 of the nuclide in the dynamic migration chamber 21 of the concrete in a penetrating way, the fourth liquid discharge pipe 50 is positioned on one side of a corresponding liquid discharge funnel 43, a third extraction pipe 51 and a second pressure gauge 52 are arranged on the top of the second sealed container 39 of the nuclide in the dynamic migration chamber 21 of the nuclide in a penetrating way, a third liquid inlet pipe 53 and a third exhaust pipe 54 are arranged on the bottom of the second sealed container 39 of the nuclide in the dynamic migration chamber 21 of the concrete in a penetrating way, the third liquid inlet pipe 53 is communicated with a luer joint 7, the water inlet end of the first liquid discharge pipe 22 is communicated with the fourth liquid discharge pipe 50 of the dynamic migration chamber 21 of the nuclide in the concrete, and the top of the automatic liquid discharge pipe 22 is communicated with the first part collector 23.
The dynamic migration simulating unit 5 of the nuclide in the bentonite medium comprises a dynamic migration chamber 24 of the nuclide in the bentonite, a second liquid discharge pipe 25 and a second automatic part collector 26, the structure of the dynamic migration chamber 24 of the nuclide in the bentonite is the same as that of the dynamic migration chamber 21 of the nuclide in the concrete, a third liquid inlet pipe 53 of the dynamic migration chamber 24 of the nuclide in the bentonite is communicated with the dynamic migration simulating unit 5 of the nuclide in the bentonite medium of the dynamic migration chamber 21 of the nuclide in the concrete, the water inlet end of the second liquid discharge pipe 25 is communicated with a fourth liquid outlet pipe 50 of the dynamic migration chamber 24 of the nuclide in the bentonite, and the water outlet end of the second liquid discharge pipe 25 is communicated with the second automatic part collector 26.
The dynamic migration simulating unit 6 of the nuclide in the granite medium comprises a dynamic migration chamber 27 of the nuclide in the granite and a third automatic part collector 28, the structure of the dynamic migration chamber 27 of the nuclide in the granite is the same as that of the action chamber 13 of the water and the granite, a first liquid inlet pipe 36 of the dynamic migration chamber 27 of the nuclide in the granite is communicated with a fourth liquid outlet pipe 50 of the dynamic migration chamber 24 of the nuclide in the bentonite, and a first liquid outlet pipe 38 of the dynamic migration chamber 27 of the nuclide in the granite is communicated with the third automatic part collector 28.
The system further comprises a plurality of plug valves 29, peristaltic pumps 30 and flow regulating needle valves 31, wherein the plug valves 29, peristaltic pumps 30 and flow regulating needle valves 31 are arranged on corresponding pipelines of the underground water and granite medium water rock action simulation unit 1, the underground water and bentonite medium water rock action simulation unit 2, the underground water and concrete medium water rock action simulation unit 3, the dynamic migration simulation unit 4 of nuclide in the concrete medium, the dynamic migration simulation unit 5 of nuclide in the bentonite medium and the dynamic migration simulation unit 6 of nuclide in the granite medium, so as to control the flow velocity, flow and on-off of fluid in each pipeline.
On the other hand, the invention provides a simulation experiment method for the actions and the nuclides of the water rocks in the multiple barriers of the treatment library, which is used for the simulation experiment device for the actions and the nuclides of the water rocks in the multiple barriers of the treatment library, and comprises the following steps:
s1: simulating water-rock interaction between underground water and granite medium, and periodically sampling and detecting aqueous solution: groundwater is sequentially led into the water and granite action chamber 13 through the groundwater tank 9, the first water sample collecting and measuring bottle 10 and the first liquid inlet pipe 36 of the water and granite action chamber 13 under the action of the corresponding peristaltic pump 30, and is led out through the first liquid outlet pipe 38 of the water and granite action chamber 13, a part of effluent flows back into the first water sample collecting and measuring bottle 10 through the first return pipe 12 under the action of the corresponding flow regulating needle valve 31 and the peristaltic pump 30 so as to be mixed with the groundwater and the original groundwater in the granite medium water rock action simulation unit 1, so that a first flow cycle is completed, and the groundwater in the first water sample collecting and measuring bottle 10 can be periodically sampled and detected through the first sampling pipe 11, and the change rule information of the chemical composition of the water after the water and granite action is obtained; the other part of effluent liquid enters the groundwater and bentonite medium water rock action simulation unit 2 through the second water inlet pipe 15 on the second water sample collecting and measuring bottle 14 under the action of the corresponding flow regulating needle valve 31 and peristaltic pump 30;
S2: simulating the interaction of water and rock between underground water and bentonite medium, and periodically sampling and detecting the water solution: after the groundwater enters the second water sample collection measuring bottle 14 through the second water inlet pipe 15 on the second water sample collection measuring bottle 14, the groundwater in the second water sample collection measuring bottle 14 is pumped into the water and bentonite action chamber 18 under the action of the corresponding peristaltic pump 30, and is discharged from the second liquid outlet pipe 44 and the third liquid outlet pipe 45 of the water and bentonite action chamber 18, the groundwater discharged from the second liquid outlet pipe 44 flows back into the second water sample collection measuring bottle 14 under the action of the corresponding flow regulating needle valve 31 and the peristaltic pump 30, so as to be mixed with the original groundwater in the second water sample collection measuring bottle 14, the first flow circulation is completed, the groundwater in the second water sample collection measuring bottle 14 can be periodically sampled and detected through the second sampling pipe 16 on the second water sample collection measuring bottle 14, the change rule information of the water chemical composition after the bentonite action is obtained, and the mutual influence between the two medium water and rock actions can be obtained through the comparison with the change information of the water chemical composition of the water obtained by the water and the medium water rock action simulating unit 1 under the action of the water sample measuring bottle 30, and the second liquid outlet pipe 16 can be obtained through the mutual influence between the two medium water and the water rock action by the water sample flowing through the third liquid outlet pipe 45 and the water sample collecting through the water sample collecting and the sample collecting unit 19;
S3: simulating the interaction of the underground water and water rock between the concrete medium, and periodically sampling and detecting the water solution: after the groundwater enters the third water sample collecting and measuring bottle 19 in the groundwater and concrete medium water rock action simulation unit 3, the groundwater in the third water sample collecting and measuring bottle 19 is pumped into the water and concrete action chamber 20 under the action of the corresponding peristaltic pump 30, the groundwater is discharged from the second liquid outlet pipe 44 and the third liquid outlet pipe 45 of the water and concrete action chamber 20, the groundwater discharged from the second liquid outlet pipe 44 flows back into the third water sample collecting and measuring bottle 19 under the action of the corresponding flow regulating needle valve 31 and peristaltic pump 30, so as to be mixed with the original groundwater in the third water sample collecting and measuring bottle 19, the first flow cycle is completed, the groundwater in the third water sample collecting and measuring bottle 19 can be periodically sampled and detected through the second sampling pipe 16 on the third water sample collecting and measuring bottle 19, the change rule information of the water chemical composition after the bentonite action is obtained, and the mutual influence between the two medium water rock actions can be obtained through the comparison with the change information of the water chemical composition of the groundwater and the water obtained by the bentonite medium water rock action simulation unit 2, and the mutual influence between the two medium water rock actions can be obtained through the mutual influence of the groundwater and the water chemical composition obtained through the second liquid outlet pipe 45 and the water chemical composition through the second liquid outlet pipe 45 on the third liquid outlet pipe of the water sample collecting and the bentonite chamber 20;
S4: simulating a dynamic migration process of nuclides in a concrete medium under the action of a groundwater carrier band and sampling and analyzing nuclide concentration: injecting a radionuclide-containing solution into a nuclide in a dynamic migration simulating unit 4 in a concrete medium through a luer connector 7 by adopting an injector 8 with the capacity of 10mL, introducing groundwater and groundwater of a concrete medium water rock action simulating unit 3 into the dynamic migration simulating unit 4 in the concrete medium through the luer connector 7, starting a dynamic migration process of the nuclide in the concrete medium, pumping out an effluent through a corresponding peristaltic pump 30, enabling one part of the effluent to enter a first automatic part collector 23 through a corresponding flow regulating needle valve 31, sampling at fixed time, and enabling the other part of the effluent to enter a dynamic migration simulating unit 5 in a bentonite medium through a corresponding flow regulating needle valve 31;
s5: simulating a dynamic migration process of nuclides in bentonite media under the action of a groundwater carrier band and sampling and analyzing nuclide concentration: when the effluent containing the radioactive nuclide enters the dynamic migration chamber 24 of the nuclide in the bentonite, starting the dynamic migration process of the nuclide in the bentonite medium, pumping out the effluent by a corresponding peristaltic pump 30, enabling one part of the effluent to enter the second automatic part collector 26 through a corresponding flow regulating needle valve 31 from the second liquid discharge pipe 25 for timing sampling, and enabling the other part of the effluent to enter the dynamic migration chamber 27 of the nuclide in the granite medium of the dynamic migration simulating unit 6 of the nuclide through the corresponding flow regulating needle valve 31;
S6: simulating a dynamic migration process of nuclides in granite media under the action of a groundwater carrier band and sampling and analyzing nuclide concentration: after the effluent containing radionuclides enters the dynamic migration chamber 27 of the nuclides in the granite, the dynamic migration process of the nuclides in the granite medium is started, after which its effluent is sampled at regular time by entering the third automatic partial collector 28.
Embodiment one:
(1) filling and saturation of granite, bentonite and concrete samples.
Firstly, respectively loading 200-mesh granite powder, 200-mesh bentonite and 200-mesh concrete samples into corresponding sample chambers in six units of a simulation experiment device for the actions of water and rock and the dynamic migration of nuclides in a multiple barrier structure of a disposal warehouse: granite powder is dry powder with a filling density of 1.6g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The bentonite powder is firstly mixed and humidified with water, the water content is adjusted to be 22 percent, then the bentonite powder is compacted and filled into a sample chamber, and the compacted dry density is 1.5g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The concrete powder is dry powder, and the compacted dry density is 1.5g/cm 3 . The sample chamber with the sample was then placed in a vacuum saturator and saturated with water for a period of one week.
(2) Simulation experiment device assembly for water rock action and nuclide migration in multiple barriers of disposal warehouse
Referring to fig. 1-10, the various components of the device are assembled in series.
(3) Experimental condition control
The experimental condition control sequentially comprises negative pressure control in the upper liquid collecting chamber, flow rate control of each peristaltic pump 30, flow control of a flow regulating needle valve 31, water sample sampling interval time control and single tube collection time control of an automatic part collector.
a. Negative pressure control in the upper liquid collecting chamber: because the permeability of the compacted bentonite and the concrete is low (the permeability coefficient of the compacted bentonite is lower than that of the concrete by two orders of magnitude), a vacuumizing mode is needed to be adopted for the upper liquid collecting chamber of the unit where the compacted bentonite and the concrete are positioned, so that negative pressure difference is formed in the upper liquid collecting chamber, and water flow is accelerated to pass through the compacted bentonite and the concrete medium sample. Thus, the magnitude of the negative pressure differential created within the upper plenum determines the rate of migration of the water flow. According to the permeability coefficients of compacted bentonite and concreted concrete, the pressure difference in the upper liquid collecting chamber of the unit where the bentonite is positioned is determined to be 300kPa (relative to the atmospheric pressure), and the pressure difference in the upper liquid collecting chamber of the unit where the concrete is positioned is determined to be 200kPa (relative to the atmospheric pressure).
b. Peristaltic pump 30 flow rate control: because the permeability coefficient of the granite powder is relatively large after the granite powder is compacted, the migration speed of the unit water flow where the granite is positioned is mainly determined by the pump speed of the peristaltic pump 30; after each effluent has exited the sample chamber, its speed of entry into the collection measuring flask and the next unit is also determined by the peristaltic pump 30 pump speed. All peristaltic pump speeds were controlled to 105 μl/min based on reported actual flow rate values of groundwater in the field.
c. Flow control needle valve 31 flow control: the effluent from a part of the units is split into two parts, one part of which enters a water sample measuring bottle or an automatic part collector, and the other part enters the next unit. Therefore, in order to strictly ensure that two parts of equal volume (which is convenient for calculating the volume of each water body) flow out, the flow rate of the water bodies in the two pipes needs to be controlled by the flow regulating needle valve 31.
d. Water sample interval time control: the water sample sampling interval is determined according to the time difference of inflow and outflow of the water body in each unit under the control of the peristaltic pump 30 and the pressure difference in the upper liquid collecting chamber, the time difference of inflow and outflow of the water body from the granite sample chamber is defined as T1, the time difference of inflow and outflow of the water body from the bentonite sample chamber is defined as T2, and the time difference of inflow and outflow of the water body from the concrete is defined as T3. And determining the water sample sampling interval time according to the actually measured T1, T2 and T3 values, and simultaneously, sampling the water body once, wherein the water body circulates once in each unit.
e. Automatic partial collector single tube collection time control: the single collection time of the automatic part collector is determined according to the effluent flow rate, the nuclide effluent concentration and the minimum measurement volume requirement of the detecting instrument on the nuclide effluent sample. Typically, the time required to reach a 2mL volume of collection per collection tube is the automatic part-collector single tube collection control time.
(4) Water sample chemical composition and nuclide concentration measuring analysis
The water sample collected from each sampling tube is sent to an ion chromatograph for chemical component analysis; and (3) acidizing the nuclide effluent samples collected from the respective movable part collectors by using an acid solution with the mass fraction of 2% and then sending the acidized nuclide effluent samples to an atomic emission spectrometer or an inductively coupled mass spectrum for measuring the nuclide ion concentration.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.

Claims (9)

1. Simulation experiment device for water rock action and nuclide migration in multiple barriers of disposal warehouse, and is characterized in that: the system comprises a groundwater and granite medium water rock action simulation unit (1), a groundwater and bentonite medium water rock action simulation unit (2), a groundwater and concrete medium water rock action simulation unit (3), a nuclide in-concrete medium dynamic migration simulation unit (4), a nuclide in-bentonite medium dynamic migration simulation unit (5), a nuclide in-granite medium dynamic migration simulation unit (6), a luer connector (7) and an injector (8), wherein the groundwater and granite medium water rock action simulation unit (1) is communicated with the groundwater and bentonite medium water rock action simulation unit (2), the groundwater and bentonite medium water rock action simulation unit (2) is communicated with the groundwater and concrete medium water rock action simulation unit (3), the groundwater and concrete medium water rock action simulation unit (3) is communicated with the nuclide in-concrete medium dynamic migration simulation unit (4) through a luer connector (7), the nuclide in-concrete medium dynamic migration simulation unit (4) is communicated with the nuclide in-bentonite medium dynamic migration simulation unit (5), and the nuclide in-bentonite medium dynamic migration simulation unit (6) is communicated with the bentonite medium dynamic migration simulation unit (6);
The injector (8) is used for containing the radionuclide and quantitatively injecting the radionuclide into the dynamic migration simulation unit (4) of the nuclide in the concrete medium, the dynamic migration simulation unit (5) of the nuclide in the bentonite medium and the dynamic migration simulation unit (6) of the nuclide in the granite medium through the luer connector (7);
the underground water and granite medium water rock action simulation unit (1), the underground water and bentonite medium water rock action simulation unit (2) and the underground water and concrete medium water rock action simulation unit (3) are used for simulating interaction between an underground water solution and water rock between different mediums and detecting chemical component changes of the water solution in real time;
the dynamic migration simulation unit (4) of the nuclide in the concrete medium, the dynamic migration simulation unit (5) of the nuclide in the bentonite medium and the dynamic migration simulation unit (6) of the nuclide in the granite medium are used for simulating the dynamic migration process of the radionuclide carried by the underground aqueous solution in different mediums after the interaction of water and rock.
2. The disposal reservoir multiple barrier water rock action and nuclide migration simulation experiment device according to claim 1, wherein: groundwater and granite medium water rock effect simulation unit (1) include groundwater water tank (9), first water sample collection measurement bottle (10), water and granite action room (13), the top intercommunication of groundwater water tank (9) and first water sample collection measurement bottle (10), the top of first water sample collection measurement bottle (10) is run through and is provided with first sampling tube (11) and first back flow (12), water and granite action room (13) include first seal container (32), the inner wall symmetry of first seal container (32) is provided with two first nylon nets (33) and two first porous water permeable plates (34), two first nylon nets (33) are located the inboard of two first porous water permeable plates (34), two be formed with first sample chamber (35) between first nylon nets (33), the top of first seal container (32) is run through and is provided with first drain pipe (38), the bottom of first seal container (32) is run through and is provided with first feed liquor (36) and first drain pipe (36), first drain pipe (36) and first drain pipe (38) are connected with first drain pipe (38).
3. The disposal reservoir multiple barrier water rock action and nuclide migration simulation experiment device according to claim 2, wherein: the underground water and bentonite water rock action simulation unit (2) comprises a second water sample collection measuring bottle (14), water and bentonite action chamber (18), a second water inlet pipe (15), a second sampling pipe (16) and a second return pipe (17) are arranged at the top of the second water sample collection measuring bottle (14) in a penetrating mode, the water and bentonite action chamber (18) comprises a second sealing container (39), two second nylon nets (40) and two second porous water permeable plates (41) are symmetrically arranged on the inner wall of the second sealing container (39), two second nylon nets (40) are positioned on the inner sides of the two second porous water permeable plates (41), a second sample chamber (42) is formed between the two second nylon nets (40), a liquid outlet funnel (43) is arranged above the second sample chamber (42) in the second sealing container (39), an upper chamber is formed above the liquid outlet funnel (43) in the second sealing container (39), the liquid outlet funnel (43) is correspondingly attached to the second nylon nets (40) and is arranged on the outer wall of the second sealing container (43) in a penetrating mode, the liquid outlet pipe (46) is arranged on the outer wall of the second sealing container (45), the bottom of the second sealed container (39) is provided with a second liquid inlet pipe (48) and a second exhaust pipe (49) in a penetrating mode, the second liquid outlet pipe (44) is communicated with the second return pipe (17), and the second liquid inlet pipe (48) is communicated with the bottom of the outer wall of the second water sample collecting and measuring bottle (14).
4. A treatment library multiple barrier water rock action and nuclide migration simulation experiment device according to claim 3, wherein: the underground water and concrete medium water rock action simulation unit (3) comprises a third water sample collection measuring bottle (19), water and concrete action chamber (20), the third water sample collection measuring bottle (19) is identical to the second water sample collection measuring bottle (14) in structure, the water and concrete action chamber (20) is identical to the bentonite action chamber (18) in structure, a second water inlet pipe (15) of the third water sample collection measuring bottle (19) is communicated with a third liquid outlet pipe (45) of the water and bentonite action chamber (18), a second liquid outlet pipe (44) of the water and concrete action chamber (20) is communicated with a second backflow pipe (17) of the third water sample collection measuring bottle (19), a second liquid inlet pipe (48) of the water and concrete action chamber (20) is communicated with the bottom of the outer wall of the third water sample collection measuring bottle (19), and a third liquid outlet pipe (45) of the water and concrete action chamber (20) is communicated with a luer joint (7).
5. The disposal reservoir multiple barrier water rock action and nuclide migration simulation experiment device according to claim 4, wherein: the dynamic migration simulation unit (4) of the nuclide in the concrete medium comprises a dynamic migration chamber (21) of the nuclide in the concrete, a first liquid discharge pipe (22) and a first automatic part collector (23), the internal structure of the dynamic migration chamber (21) of the nuclide in the concrete is identical to that of a water and bentonite action chamber (18), a fourth liquid outlet pipe (50) is arranged on the outer wall of a second sealing container (39) of the nuclide in the dynamic migration chamber (21) in a penetrating manner in the concrete, the fourth liquid outlet pipe (50) is located on one side of a corresponding liquid outlet funnel (43), a third exhaust pipe (51) and a second pressure gauge (52) are arranged on the top of a second sealing container (39) of the nuclide in the concrete in a penetrating manner in the concrete, a third liquid inlet pipe (53) and a third exhaust pipe (54) are arranged on the bottom of the second sealing container (39) in the concrete in a penetrating manner, the third liquid inlet pipe (53) is communicated with a luer joint (7), and the first liquid discharge pipe (22) of the nuclide in the dynamic migration chamber (21) is communicated with the first liquid discharge pipe (23) at the liquid discharge pipe.
6. The disposal reservoir multiple barrier water rock action and nuclide migration simulation experiment device according to claim 5, wherein: the dynamic migration simulation unit (5) of the nuclide in the bentonite medium comprises a dynamic migration chamber (24) of the nuclide in the bentonite, a second liquid discharge pipe (25) and a second automatic part collector (26), the structure of the dynamic migration chamber (24) of the nuclide in the bentonite is the same as that of the dynamic migration chamber (21) of the nuclide in the concrete, a third liquid inlet pipe (53) of the dynamic migration chamber (24) of the nuclide in the bentonite is communicated with the dynamic migration simulation unit (5) of the nuclide in the bentonite medium of the dynamic migration chamber (21) of the nuclide in the concrete, a water inlet end of the second liquid discharge pipe (25) is communicated with a fourth liquid outlet pipe (50) of the dynamic migration chamber (24) of the nuclide in the bentonite, and a water outlet end of the second liquid discharge pipe (25) is communicated with the second automatic part collector (26).
7. The disposal reservoir multiple barrier water rock action and nuclide migration simulation experiment device of claim 6, wherein: the dynamic migration simulation unit (6) of the nuclide in the granite medium comprises a dynamic migration chamber (27) of the nuclide in the granite and a third automatic part collector (28), the structure of the dynamic migration chamber (27) of the nuclide in the granite is the same as that of the water and the granite action chamber (13), a first liquid inlet pipe (36) of the dynamic migration chamber (27) of the nuclide in the granite is communicated with a fourth liquid outlet pipe (50) of the dynamic migration chamber (24) of the nuclide in the bentonite, and a first liquid outlet pipe (38) of the dynamic migration chamber (27) of the nuclide in the granite is communicated with the third automatic part collector (28).
8. The disposal reservoir multiple barrier water rock action and nuclide migration simulation experiment device of claim 7, wherein: the system further comprises a plurality of plug valves (29), peristaltic pumps (30) and flow regulating needle valves (31), wherein the plug valves (29), peristaltic pumps (30) and flow regulating needle valves (31) are arranged on corresponding pipelines in the underground water and granite medium water rock action simulation unit (1), the underground water and bentonite medium water rock action simulation unit (2), the underground water and concrete medium water rock action simulation unit (3), the dynamic migration simulation unit (4) of nuclides in the concrete medium, the dynamic migration simulation unit (5) of nuclides in the bentonite medium and the dynamic migration simulation unit (6) of nuclides in the granite medium, so that the flow speed, the flow rate and the on-off of fluid in each pipeline are controlled.
9. A simulation experiment method for the actions and the nuclides of a plurality of barriers in a treatment library, which is used for the simulation experiment device for the actions and the nuclides of the water rocks in the plurality of barriers in the treatment library according to any one of claims 1 to 8, and is characterized in that: the method comprises the following steps:
s1: simulating water-rock interaction between underground water and granite medium, and periodically sampling and detecting aqueous solution: under the action of a corresponding peristaltic pump (30), groundwater is sequentially led into the water and granite action chamber (13) through the groundwater tank (9), the first water sample collecting and measuring bottle (10) and a first liquid inlet pipe (36) of the water and granite action chamber (13), and is led out through a first liquid outlet pipe (38) of the water and granite action chamber (13), and a part of effluent flows back into the first water sample collecting and measuring bottle (10) through a first backflow pipe (12) under the action of a corresponding flow regulating needle valve (31) and the peristaltic pump (30) so as to be mixed with the original groundwater in the groundwater and granite medium water rock action simulation unit (1), so that first flow circulation is completed, and the groundwater in the first water sample collecting and measuring bottle (10) can be periodically sampled and detected through the first sampling pipe (11), so that the change rule information of the chemical composition of water after the water and granite action is obtained; the other part of effluent liquid enters the groundwater and bentonite medium water rock action simulation unit (2) through a second water inlet pipe (15) on a second water sample collecting and measuring bottle (14) under the action of a corresponding flow regulating needle valve (31) and a peristaltic pump (30);
S2: simulating the interaction of water and rock between underground water and bentonite medium, and periodically sampling and detecting the water solution: after groundwater enters the second water sample collection measuring bottle (14) through a second water inlet pipe (15) on the second water sample collection measuring bottle (14), the groundwater in the second water sample collection measuring bottle (14) is pumped into a water and bentonite reaction chamber (18) under the action of a corresponding peristaltic pump (30), and is discharged through a second liquid outlet pipe (44) and a third liquid outlet pipe (45) of the water and bentonite reaction chamber (18), the groundwater discharged through the second liquid outlet pipe (44) flows back into the second water sample collection measuring bottle (14) under the action of a corresponding flow regulating needle valve (31) and a peristaltic pump (30), so as to be mixed with the original groundwater in the second water sample collection measuring bottle (14), the first flow circulation is completed, the groundwater in the second water sample collection measuring bottle (14) can be periodically sampled and detected through a second sampling pipe (16) on the second water sample collection measuring bottle (14), the chemical composition change information of water and bentonite after the reaction is obtained, and the chemical composition change information of water and the water can be obtained through the interaction with a rock water sample collecting unit (1) under the ground, and the water sample collecting medium can be compared with the water sample change law medium, the underground water discharged by a third liquid outlet pipe (45) on the water and bentonite acting chamber (18) enters a third water sample collecting and measuring bottle (19) of the underground water and concrete medium water rock acting simulation unit (3) under the action of a corresponding flow regulating needle valve (31) and a peristaltic pump (30);
S3: simulating the interaction of the underground water and water rock between the concrete medium, and periodically sampling and detecting the water solution: after groundwater enters a third water sample collection measuring bottle (19) in a groundwater and concrete medium water rock action simulation unit (3), groundwater in the third water sample collection measuring bottle (19) is pumped into a water and concrete action chamber (20) under the action of a corresponding peristaltic pump (30), and is discharged from a second liquid outlet pipe (44) and a third liquid outlet pipe (45) of the water and concrete action chamber (20), groundwater discharged from the second liquid outlet pipe (44) flows back into the third water sample collection measuring bottle (19) under the action of a corresponding flow regulating needle valve (31) and the peristaltic pump (30), so as to be mixed with the original groundwater in the third water sample collection measuring bottle (19), the first flow circulation is completed, the groundwater in the third water sample collection measuring bottle (19) can be periodically sampled and detected through a second sampling tube (16) on the third water sample collection measuring bottle (19), chemical component change information of the water and the bentonite after the action is acquired, and the chemical component change information of the water can be acquired through the mutual action of the water and the peristaltic pump (30) and the corresponding flow regulating needle valve (31) and the water sample collection measuring bottle (30), and the water in the water sample collection measuring bottle (19) can be discharged from the water sample collection measuring bottle (20) under the action of the water sample collection medium (2) and the water sample collection medium (7;
S4: simulating a dynamic migration process of nuclides in a concrete medium under the action of a groundwater carrier band and sampling and analyzing nuclide concentration: injecting a radionuclide-containing solution into a nuclide in a dynamic migration simulating unit (4) in a concrete medium through a luer connector (7) by adopting an injector (8) with the capacity of 10mL, introducing groundwater and the groundwater of the dynamic migration simulating unit (3) in the concrete medium into the nuclide in the dynamic migration simulating unit (4) in the concrete medium through adjusting the luer connector (7), starting the dynamic migration process of the nuclide in the concrete medium, pumping out an effluent liquid of the nuclide in the concrete medium through a corresponding peristaltic pump (30), enabling one part of the effluent liquid to enter a first automatic part collector (23) through a corresponding flow adjusting needle valve (31) for timing sampling, and enabling the other part of the effluent liquid to enter a nuclide in a dynamic migration simulating unit (5) in the bentonite medium through a corresponding flow adjusting needle valve (31) into a nuclide in a dynamic migration simulating chamber (24) in the bentonite medium;
s5: simulating a dynamic migration process of nuclides in bentonite media under the action of a groundwater carrier band and sampling and analyzing nuclide concentration: when the effluent containing the radioactive nuclide enters a dynamic migration chamber (24) of the nuclide in the bentonite, starting a dynamic migration process of the nuclide in the bentonite medium, pumping out the effluent by a corresponding peristaltic pump (30), enabling one part of the effluent to enter a second automatic part collector (26) through a corresponding flow regulating needle valve (31) for timing sampling, and enabling the other part of the effluent to enter a dynamic migration chamber (27) of the nuclide in a dynamic migration simulation unit (6) of the nuclide in the granite medium through a corresponding flow regulating needle valve (31);
S6: simulating a dynamic migration process of nuclides in granite media under the action of a groundwater carrier band and sampling and analyzing nuclide concentration: after the effluent containing radionuclides enters the dynamic migration chamber (27) of the nuclides in the granite, the dynamic migration process of the nuclides in the granite medium is started, after which the effluent is sampled at regular time by entering the third automatic partial collector (28).
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