CN215677978U

CN215677978U - Experimental device for influence permeability and solute migration in simulation groundwater

Info

Publication number: CN215677978U
Application number: CN202121456326.7U
Authority: CN
Inventors: 刘宇; 张佳; 刘明柱
Original assignee: China University of Geosciences Beijing
Current assignee: China University of Geosciences Beijing
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2022-01-28
Anticipated expiration: 2031-06-29

Abstract

The utility model discloses an experimental device for simulating influence on permeability and solute migration in underground water, which comprises a sealing system, a water inlet system, a sand box main body, a sampling system and a water outlet system, wherein one side of the water inlet system is connected with the sand box main body, one side of the sand box main body is connected with the water outlet system, and the sand box main body, the sampling system and the water outlet system are provided with the sealing system. The experiment uses the detachable sampling device, so that the internal sampling tube can be prevented from being broken during sand filling, and sand filling and sand unloading can be carried out more quickly; the influence of mineral dissolution sediment on the osmotic coefficient is considered in this experiment, sets up to level pressure water inlet tank and level pressure pollutant water tank into, forms comparatively obvious contact zone, can be clear on the contact zone monitor the formation of mineral sediment and the change of osmotic coefficient, also can calculate the influence of change of osmotic coefficient to pollutant migration simultaneously.

Description

Experimental device for influence permeability and solute migration in simulation groundwater

Technical Field

The utility model relates to the field of polluted hydrogeology, in particular to an experimental device for simulating influence on permeability and solute migration in underground water.

Background

The leakage of contaminants into the ground water has serious adverse effects on the underground environment and human health. To address this phenomenon, it is necessary to predict the migration process of contaminants in groundwater, and the indoor sand box experiment is a common and effective method for simulating the migration of contaminants in groundwater.

The acid pollution plume is produced while producing pollutants, when the acid pollution plume flows through an underground medium, minerals of the underground medium are dissolved certainly, but due to the neutralization effect of underground water, insoluble metal ions dissolved are precipitated on the contact surface of the pollution plume and the underground water due to the increase of pH, pores are blocked, and the subsequent transportation of the pollution plume is influenced.

In a traditional indoor sand box experiment, the influence of mineral dissolution and precipitation on a medium permeability coefficient is often ignored, and the defects of difficulty in sand filling, single hydraulic gradient, poor sealing property and the like exist, so that the improvement of the sand box is necessary to enhance the authenticity of indoor simulation.

Based on the experimental device, the experimental device for simulating influence on permeability and solute migration in underground water is designed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an experimental device for simulating influence on permeability and solute migration in underground water, so as to solve the technical problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides an experimental apparatus for influence permeability and solute migration in simulation groundwater, this experimental apparatus includes sealing system, water intake system, sand box main part, sampling system and water outlet system, water intake system one side is connected with the sand box main part, sand box main part one side is connected with water outlet system, be provided with sealing system on sand box main part, the sampling system and the water outlet system.

As a further scheme of the utility model, the water inlet system consists of a constant-pressure water inlet tank 4, a constant-pressure pollutant inlet water tank, a pollutant water outlet, a common water outlet, a high-capacity pollutant storage bottle, a high-capacity water storage bottle, a water-stop baffle and a peristaltic pump.

As a further scheme of the utility model, one side of the constant-pressure water inlet tank is a constant-pressure pollutant inlet water tank, one side of the constant-pressure water inlet tank is provided with a water-proof baffle plate on the constant-pressure pollutant inlet water tank, a pollutant water outlet and a common water outlet are arranged below the constant-pressure water inlet tank, the pollutant water outlet is communicated with a large-capacity pollutant storage bottle through a pipeline, the common water outlet is communicated with a large-capacity water storage bottle through a pipeline, and the large-capacity pollutant storage bottle and the large-capacity water storage bottle are both connected with a peristaltic pump through pipelines.

As a further scheme of the utility model, the sand box main body consists of a sand tank, sampling ports and a porous partition plate, wherein the sand tank is provided with the porous partition plate, and the porous partition plate is provided with a plurality of sampling ports.

As a further scheme of the utility model, the sampling system consists of a detachable sampling device, the detachable sampling device consists of a plurality of sampling tubes, an inner core, a rubber ring and a cover, the sampling tubes are all connected with a peristaltic pump through pipelines, the sampling tubes are inserted into the inner core and placed into a sampling port, the rubber ring is sleeved on one end of the inner core 19, and the sampling port is in spiral fit with the cover.

As a further scheme of the utility model, the water outlet system consists of an adjustable water outlet and a water outlet tank, the water outlet tank is arranged on one side of the sand box main body, and the adjustable water outlet is arranged on one side of the water outlet tank.

As a further scheme of the utility model, the sand box comprises a sealing system flange A, a flange B and a flange C, wherein the sealing system flange A is arranged at the tops of a constant-pressure water inlet box and a constant-pressure pollutant water inlet box, the flange B is arranged at the top of a water outlet box, and the flange C is arranged at the top of the sand box.

Compared with the prior art, the utility model has the beneficial effects that:

1. the experiment uses the detachable sampling device, so that the internal sampling tube can be prevented from being broken during sand filling, and sand filling and sand unloading can be carried out more quickly;

2. in the experiment, the influence of mineral dissolution and precipitation on the permeability coefficient is considered, the constant-pressure water inlet tank and the constant-pressure pollutant inlet tank are arranged to form a relatively obvious contact zone, the formation of the mineral precipitation and the change of the permeability coefficient can be clearly monitored on the contact zone, and meanwhile, the influence of the change of the permeability coefficient on the migration of pollutants can be calculated;

3, clay is filled at the top and the bottom of the sand box, and a flange is additionally arranged at the top, so that the influence of side wall flow can be reduced, and a good sealing effect can be achieved;

4. the water outlet system is set as an adjustable water outlet, so that hydraulic gradient can be reasonably adjusted according to actual sand filling conditions in the experimental process, the experimental process is controlled, and expected results are obtained.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a front view of an experimental apparatus for simulating permeability and solute transport effects in groundwater according to the present invention;

FIG. 2 is a schematic diagram of a detachable sampling device of an experimental apparatus for simulating permeability and solute migration in groundwater according to the present invention;

the names of the structures represented by the reference numerals in the description of the drawings are as follows:

1. an experimental device; 2. a flange A; 3. a flange B; 4. a constant pressure water inlet tank; 5. constant pressure into a pollutant water tank; 6. a flange C; 7. an adjustable water outlet; 8. a water outlet tank; 9. a sand tank; 10. a sampling port; 11. a contaminant outlet; 12. a common water outlet; 13. a high-capacity pollutant storage bottle; 14. a large-capacity water storage bottle; 15. a water-stop baffle; 16. a porous separator; 17; a peristaltic pump; 18. a sampling tube; 19. an inner core; 20. a rubber ring; 21. a cover; .

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides an experimental apparatus for influence permeability and solute migration in simulation groundwater, this experimental apparatus includes sealing system, water intake system, sand box main part, sampling system and water outlet system, and water intake system one side is connected with the sand box main part, and sand box main part one side is connected with water outlet system, is provided with sealing system on sand box main part, sampling system and the water outlet system.

The water inlet system consists of a constant-pressure water inlet tank 4, a constant-pressure pollutant inlet water tank 5, a pollutant water outlet 11, a common water outlet 12, a large-capacity pollutant storage bottle 13, a large-capacity water storage bottle 14, a waterproof baffle 15 and a peristaltic pump 17.

One side of case 4 is intake for the level pressure pollutant water tank 5, one side of case 4 is intake for the level pressure and is provided with water proof baffle 15 on the pollutant water tank 5, the below of case 4 is intake for the level pressure is provided with pollutant delivery port 11, ordinary delivery port 12, pollutant delivery port 11 stores up pollutant bottle 13 through pipeline intercommunication large capacity, ordinary delivery port 12 is through pipeline intercommunication large capacity water storage bottle 14, large capacity stores up pollutant bottle 13 and large capacity water storage bottle 14 and all has peristaltic pump 17 through pipe connection. The influence of mineral dissolution sediment on the osmotic coefficient is considered in this experiment, sets up to level pressure water inlet tank and level pressure pollutant water tank into, forms comparatively obvious contact zone, can be clear on the contact zone monitor the formation of mineral sediment and the change of osmotic coefficient, also can calculate the influence of change of osmotic coefficient to pollutant migration simultaneously.

The sand box main body consists of a sand groove 9, sampling ports 10 and a porous partition plate 16, wherein the sand groove 9 is provided with the porous partition plate 16, and the porous partition plate 16 is provided with a plurality of sampling ports 10.

The sampling system comprises detachable sampling device, and detachable sampling device comprises a plurality of sampling tubes 18, inner core 19, rubber ring 20 and lid 21, and sampling tube 18 all passes through pipe connection peristaltic pump 17, and during sampling tube 18 inserted into inner core 19 and put into sample connection 10, inner core 19 served the cover and had rubber ring 20, sample connection 10 and lid 21 spiral cooperation. Detachable sampling device can effectually solve the problem that the sand box filled the sand difficulty, and convenient the dismantlement, the leakproofness is good, can change inner core and sampling tube at any time, and the easy cracked problem of sampling tube has improved work efficiency greatly when effectual having solved filled the sand. The detachable sampling device consists of a sampling tube 18, an inner core 19, a rubber ring 20 and a cover 21, wherein during assembly, the sampling tube 18 is inserted into the inner core 19 and placed into the sampling port 10, the rubber ring 20 is placed on the inner core 19, and the cover 21 is screwed down. Detachable sampling device is used in this experiment, the inside sampling tube fracture condition's that appears when not only can preventing to pack sand the emergence, also can be more quick equally fill sand and unload sand.

The water outlet system consists of an adjustable water outlet 7 and a water outlet tank 8, the water outlet tank 8 is arranged on one side of the sand box main body, and the adjustable water outlet 7 is arranged on one side of the water outlet tank 8; the adjustable water outlet 7 can effectively solve the problem of single hydraulic gradient, and through adjusting the hydraulic gradient, a better control experiment can be realized, and a better result can be obtained. The adjustable water outlet 7 consists of 12 water outlet ports, the center distance of the water outlet ports is 1cm, the water outlet ports are externally connected with water guide hoses and are clamped by water stop clamps, and when the hydraulic gradient is set, the water stop clamps with corresponding heights are only needed to be opened. The water outlet system is set as an adjustable water outlet, so that hydraulic gradient can be reasonably adjusted according to actual sand filling conditions in the experimental process, the experimental process is controlled, and expected results are obtained.

Sealing system flange A2, flange B3 and flange C6 constitute, and sealing system flange A2 sets up in the top of level pressure inlet tank 4 and level pressure advance pollutant water tank 5, and flange B3 sets up the top at water outlet tank 8, and flange C6 sets up the top at the sand box. Clay is filled at the top and the bottom of the sand box, and the flange is additionally arranged at the top, so that the influence of side wall flow can be reduced, and a good sealing effect can be achieved.

Experimental procedure

1, cleaning a sand box and sand:

dismantling all detachable sampling devices of the sand box, washing the sand box clean by deionized water, and drying the sand box for later use after cleaning sandy soil and pollutants;

selecting experimental pre-filled sand, cleaning and drying for later use.

2 disposition of contaminants

According to the specific requirements of the experiment, target pollutants and precipitated metal ions are selected, the expected pH value is set, the pollutant consumption in the whole experiment process is calculated, and the configured pollutants are placed in a large-capacity pollutant storage bottle 13.

3 filling sand

Firstly, a gauze is laid on the side close to the porous partition plate in the sand groove 9 to prevent sand from running out of the sand groove 9. And paving 1cm of clay at the bottom of the sand tank 9, and compacting by using a hammer. Then 2.5cm of sandy soil is laid on the clay, compacted by a hammer, and provided with a corresponding detachable sampling device, then the operation is repeated, the corresponding detachable sampling device is provided after the last row of detachable sampling devices are filled with 5cm of sand and compacted, after the last row of detachable sampling devices are installed, the last row of detachable sampling devices are continuously filled with 2.5cm of sandy soil and compacted, and then 1.5 rows of clay is added, and a flange 6 is arranged. All detachable sampling devices are connected with an external sampling tube and clamped by a water stop clamp. The clay and the flange 6 act together to enhance the sealing performance.

4 flask saturation

The peristaltic pump 17 is utilized to inject water in the large-capacity water storage bottle 14 into the constant-pressure water inlet tank 4 and the constant-pressure pollutant water inlet tank 5, water injection is started to the sand box, after the sand box is full, the water stop clamp is opened to discharge air in the detachable sampling device, the water stop clamp is closed to continuously feed water for 1 hour, the sand box is made to be stable, and the flow is detected.

5 adjusting the hydraulic gradient

For artificial reasons, the overall permeability coefficient of the sand box after sand filling may not be the same as expected, and at this time, the adjustable water outlet 7 needs to be adjusted, the hydraulic gradient needs to be adjusted, and the experiment needs to be controlled according to darcy's law Q = KAI.

6 contaminant injection

Opening the flange 2, quickly pumping water with constant pressure into the pollutant water tank 5 and injecting pollutants, closing the flange 2, connecting the high-capacity pollutant storage bottle 13 to a pollutant water inlet 18 through a water guide hose 1, and opening the peristaltic pump 17.

7 sampling

According to the specific requirements of the experiment, a time node is selected, a water stop clamp of an external sampling hose is opened for sampling, and one sampling is recommended to be not more than 5 mL.

8 monitoring of mineral precipitation

After the experiment, the flange 6 is opened to the water that the pollutant water tank 5 and the play water tank 8 were advanced to discharge level pressure inlet tank 4, level pressure, and the sand is dug in proper order to one deck from the top down, survey mineral precipitation volume (if the digestion method), and when the sand face was less than detachable sampling device, demolish detachable sampling device to the soil sample is dug to the rapider.

This time the test was completed.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides an experimental apparatus for influence permeability and solute migration in simulation groundwater, its characterized in that, this experimental apparatus (1) includes sealing system, water intake system, sand box main part, sampling system and water outlet system, water intake system one side is connected with the sand box main part, sand box main part one side is connected with water outlet system, be provided with sealing system on sand box main part, the sampling system and the water outlet system.

2. The experimental facility for simulating permeability and solute transport in groundwater as claimed in claim 1, wherein: the water inlet system is composed of a constant-pressure water inlet tank (4), a constant-pressure pollutant inlet water tank (5), a pollutant water outlet (11), a common water outlet (12), a high-capacity pollutant storage bottle (13), a high-capacity water storage bottle (14), a waterproof baffle (15) and a peristaltic pump (17).

3. The experimental facility for simulating permeability and solute transport in groundwater as claimed in claim 2, wherein: one side of case (4) is intake for the level pressure pollutant water tank (5) into to the level pressure, one side of case (4) is intake for the level pressure and is provided with water proof baffle (15) on pollutant water tank (5) into to the level pressure, the below of case (4) is intake to the level pressure is provided with pollutant delivery port (11), ordinary delivery port (12), pollutant delivery port (11) store up pollutant bottle (13) through pipeline intercommunication large capacity, ordinary delivery port (12) are through pipeline intercommunication large capacity water storage bottle (14), large capacity water storage pollutant bottle (13) and large capacity water storage bottle (14) all have peristaltic pump (17) through pipe connection.

4. The experimental facility for simulating permeability and solute transport in groundwater as claimed in claim 1, wherein: the sand box main body is composed of a sand groove (9), sampling ports (10) and a porous partition plate (16), wherein the sand groove (9) is provided with the porous partition plate (16), and the porous partition plate (16) is provided with a plurality of sampling ports (10).

5. The experimental facility for simulating permeability and solute transport in groundwater as claimed in claim 1, wherein: the sampling system comprises detachable sampling device, detachable sampling device comprises a plurality of sampling tubes (18), inner core (19), (20) rubber ring and lid (21), peristaltic pump (17) is all connected through the pipeline in sampling tube (18), during sample connection (10) was put into in sampling tube (18) inserted inner core (19), one pot head of inner core (19) has rubber ring (20), sample connection (10) and lid (21) screw-type fit.

6. The experimental facility for simulating permeability and solute transport in groundwater as claimed in claim 1, wherein: the water outlet system is composed of an adjustable water outlet (7) and a water outlet tank (8), the water outlet tank (8) is arranged on one side of the sand box main body, and the adjustable water outlet (7) is arranged on one side of the water outlet tank (8).

7. The experimental facility for simulating permeability and solute transport in groundwater as claimed in claim 1, wherein: the sealing system comprises a flange A (2), a flange B (3) and a flange C (6), wherein the flange A (2) of the sealing system is arranged at the tops of a constant-pressure water inlet tank (4) and a constant-pressure water inlet pollutant tank (5), the flange B (3) is arranged at the top of a water outlet tank (8), and the flange C (6) is arranged at the top of a sand box.