CN112986064B - Experimental device for simulating karst pipeline network water burst blocking - Google Patents
Experimental device for simulating karst pipeline network water burst blocking Download PDFInfo
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- CN112986064B CN112986064B CN202110156097.5A CN202110156097A CN112986064B CN 112986064 B CN112986064 B CN 112986064B CN 202110156097 A CN202110156097 A CN 202110156097A CN 112986064 B CN112986064 B CN 112986064B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
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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
- G01N33/24—Earth materials
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- 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
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The application relates to a water burst blocking experimental device for a simulated karst pipeline network, which comprises a plurality of karst pipelines, wherein two adjacent karst pipelines are connected through branch pipelines to form the karst pipeline network, the karst pipelines of the karst pipeline network have various dimensions, one end of the karst pipeline network is connected with a water supply mechanism and a grouting mechanism, the other end of the karst pipeline network is provided with a collecting mechanism, and the karst pipeline and the branch pipelines are provided with pressure monitoring pieces and water stop valves.
Description
Technical Field
The application relates to the technical field of experimental equipment, in particular to an experimental device for simulating karst pipeline network water burst blocking.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, underground engineering construction enters a high-speed development period, a plurality of karst landforms are formed, the geological structure is complex, and the problem of gushing water is a main geological disaster in tunnel construction. In the underground tunnel excavation, if the underground water rich region is encountered, the excavation is often blocked, a large amount of time, labor, materials and equipment are consumed, and the tunnel collapse and engineering failure are caused when serious.
In the grouting reinforcement process, the water-containing karst pipeline network often contains a series of karst pipelines with different pipe diameters and complicated, the main water piping is difficult to accurately find in the traditional water piping grouting plugging process for grouting reinforcement, the slurry dosage, slurry flow distribution, grouting reinforcement time, grouting reinforcement effect and the like are quite different in the process of grouting plugging the drilling holes of the karst pipelines with different pipe diameters, and particularly in the process of grouting reinforcement of the drilling holes of the micro karst pipelines, whether the slurry can fill the whole karst pipeline or not can reach the expected effect and the like are not researched at present, so that the water piping system is a main problem to be solved at present. The method can form a new grouting reinforcement theory to better guide the plugging of the broken belt of the water-containing multi-karst pipeline.
Related researchers at home and abroad develop a series of single karst pipeline water-flushing grouting plugging model tests, mainly reveal grouting reinforcement effect of a pipeline when grouting reinforcement of a single karst pipeline, and the inventor finds that, aiming at a karst pipeline network, when drilling grouting reinforcement is carried out on karst pipelines with different pipe diameters, the flow distribution condition and grouting reinforcement effect of main karst pipelines with different pipe diameters and the flow distribution and reinforcement condition of the whole karst pipeline network when drilling grouting reinforcement is carried out on main karst pipelines, secondary karst pipelines and micro karst pipelines respectively are researched, and at this time, the single karst pipeline model cannot meet the requirement.
Disclosure of Invention
The application aims to overcome the defects of the prior art, provides the experimental device for simulating the water burst blocking of the karst pipeline network, can realize the flow distribution and reinforcement condition during the research of the grouting blocking of the drilling holes of the karst pipeline network, and has better theoretical guiding significance.
In order to achieve the above purpose, the application adopts the following technical scheme:
in a first aspect, the application provides an experimental device for simulating water burst blocking of a karst pipeline network, which comprises a plurality of karst pipelines, wherein two adjacent karst pipelines are connected through branch pipelines to form the karst pipeline network, the karst pipelines of the karst pipeline network have various dimensions, one end of the karst pipeline network is connected with a water supply mechanism and a grouting mechanism, the other end of the karst pipeline network is provided with a collecting mechanism, and pressure monitoring pieces and water stop valves are arranged on the karst pipeline and the branch pipelines.
Furthermore, the karst pipeline is formed by splicing a plurality of pipe sections, and each pipe section is provided with a pressure monitoring piece and a water stop valve.
Further, the water supply mechanism comprises a pressure-bearing water tank, the pressure-bearing water tank is connected with a water supply pump through a pipeline, the water supply pump is connected with a water supply tank through a pipeline, the pressure-bearing water tank is further connected with an air compressor through a pipeline, and a water outlet of the pressure-bearing water tank is connected with a karst pipeline network.
Furthermore, a pressure controller is also arranged on the pipeline between the air compressor and the pressure-bearing water tank.
Further, the grouting mechanism comprises a pressure testing machine, a stirring tank is arranged below a pressure head of the pressure testing machine, a stirring assembly connected with a power mechanism is arranged in the stirring tank, and a discharge hole of the stirring tank is connected with a karst pipeline network.
Further, the pressure head of the pressure testing machine is provided with an exhaust pipe, and an exhaust valve is arranged on the exhaust pipe.
Further, the guide rail is arranged below the pressure head of the pressure testing machine, the stirring tank is in sliding connection with the guide rail, and the stirring tank can move to a position right below the pressure head or away from the position right below the pressure head through the guide rail.
Further, karst pipe network is placed in the backup pad, the backup pad is connected with a plurality of jacking piece, and the jacking piece is used for adjusting the height of backup pad.
Further, the collecting mechanism comprises a collecting box, a water outlet is arranged at the bottom of the collecting box, and an overflow pipe arranged in the collecting box is arranged at the water outlet.
Further, the karst pipeline and the branch pipeline are made of transparent materials, and an image acquisition element is arranged on one side of the karst pipeline.
The application has the beneficial effects that:
1. the experimental device provided by the application is provided with a plurality of karst pipelines, the karst pipelines are provided with a plurality of different specifications, the karst pipelines are connected through the branch pipelines to form a karst pipeline network, each karst pipeline is provided with a pressure detection part and a water stop valve, the karst pipeline network is connected with a water supply mechanism and a grouting mechanism, the flow distribution and the diffusion blocking condition of slurry in the different karst pipelines in the karst pipeline network can be simulated, the condition of blocking a broken belt of the water-containing karst pipeline network by particle materials can be simulated more truly, the filling condition of the karst pipelines in rock mass after drilling grouting reinforcement of the karst pipelines with different pipe diameters can be predicted effectively, the mechanism of the diffusion mechanism and the blocking water burst mechanism of particle materials in the water-containing structure are researched accurately, and a reference is provided for building a relevant mathematical model and providing a reference for the blocking theory of grouting such as crack water burst and the like by the particle materials.
2. The experimental device comprises the pressure testing machine and the stirring tank, the pressure testing machine can uniformly press the slurry into the karst pipe network at constant pressure or constant speed while stirring the slurry, so that the uniform stability of the slurry injected into the karst pipe network is ensured, and the injection quantity of the slurry can be freely regulated through the pressure testing machine, so that the plugging simulation test of the particle grouting materials with different grouting quantities and different grouting pressures on the broken water gushing in the fracture can be carried out by depending on the experimental device.
3. The experimental device disclosed by the application has the advantages that the karst pipeline is formed by splicing a plurality of pipeline sections, the disassembly is convenient, the operation is simple, the pipeline sections can be recycled, and the plugging effect of the particle grouting material can be evaluated by testing the hydraulic ultimate bearing capacity of the particle grouting material by matching with the water supply mechanism after the experiment is completed.
4. According to the experimental device disclosed by the application, the overflow pipe is arranged at the water outlet of the collecting box of the collecting mechanism, the slurry entering the collecting box can be precipitated, when the particle materials are precipitated at the bottom of the collecting box, and when the upper layer water accumulation height is higher than the overflow pipe, the sewage can be discharged through the overflow pipe and the water outlet, so that the sewage storage capacity is greatly improved.
5. According to the experimental device, the karst pipeline is made of transparent materials, so that visualization of the experimental process is realized, and qualitative description of the plugging gushing water condition in the experimental process is facilitated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present application;
FIG. 2 is a schematic diagram of a karst pipe network according to example 1 of the present application;
FIG. 3 is a schematic diagram of a pipe section structure of a karst pipeline according to embodiment 1 of the present application;
FIG. 4 is a schematic structural diagram of a grouting mechanism according to embodiment 1 of the present application;
FIG. 5 is a front view of the grouting mechanism of embodiment 1 of the present application;
FIG. 6 is a top view of the agitator tank of example 1 of the present application;
FIG. 7 is a schematic view of a collection mechanism according to embodiment 1 of the present application;
FIG. 8 is a schematic view showing the installation of a support plate and a jackscrew according to embodiment 1 of the present application;
FIG. 9 is a schematic diagram of a plugging pressure test section according to embodiment 1 of the present application;
wherein, 1-1 part of karst pipe network, 1-2 parts of main karst pipe, 1-3 parts of micro karst pipe, 1-4 parts of secondary karst pipe, 1-5 parts of branch pipe, 1-6 parts of tee joint, 1-7 parts of movable screw, 1-8 parts of water flow pressure sensor, 1-9 parts of pipe network water stop valve, 1-9 parts of high definition camera, 2 parts of input main pipe, 3 parts of water supply mechanism, 3-1 parts of pressure-bearing water tank, 3-2 parts of water supply pump, 3-3 parts of water supply tank, 3-4 parts of air compressor, 3-5 parts of pressure controller, 3-6 parts of water flow sensor and 3-7 parts of flow valve, 4-1 parts of grouting mechanism, 4-2 parts of universal pressure testing machine, 4-3 parts of stirring tank, 4-4 parts of rotating rod, 4-5 parts of stirring shaft, 4-5 parts of belt transmission mechanism, 4-6 parts of driving motor, 4-7 parts of pressure head, 4-8 parts of exhaust pipe, 4-9 parts of grouting flow sensor, 4-10 parts of grouting pressure sensor, 4-11 parts of grouting water stop valve, 5 parts of collecting mechanism, 5-1 parts of collecting box, 5-2 parts of collecting box bracket, 5-3 parts of overflow pipe, 5-4 parts of rubber hose, 6 parts of upper computer, 7 parts of supporting plate and 8 parts of screw jack.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
For convenience of description, the words "upper", "lower", "left" and "right" in the present application, if they mean only the directions of upper, lower, left and right in correspondence with the drawings themselves, are not limiting in structure, but merely serve to facilitate description of the present application and simplify description, rather than to indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
As described in the background art, the prior experimental device cannot be used for researching the drilling grouting reinforcement effect of a karst pipe network, and aiming at the problems, the application provides the experimental device for simulating water burst blocking of the karst pipe network.
In an exemplary embodiment of the application, as shown in fig. 1-8, an experimental device for simulating water burst blocking of a karst pipeline network comprises a karst pipeline network 1, wherein the karst pipeline network comprises a plurality of karst pipelines which are arranged in parallel and have different sizes, a plurality of branch pipelines 1-4 are connected between adjacent karst pipelines, and the karst pipeline network is formed by the plurality of karst pipelines and the branch pipelines.
Preferably, the karst pipeline network is provided with karst pipelines of three specifications, the karst pipeline with the largest diameter is used for simulating the main karst pipeline 1-1, the karst pipeline with the smallest diameter is used for simulating the micro karst pipeline 1-2, and the karst pipeline with the third size is used for simulating the secondary karst pipeline 1-3.
In the embodiment, the karst pipeline and the branch pipeline are made of transparent acrylic materials, so that visualization of an experimental process is realized, and qualitative description of blocking gushing water conditions in the experimental process is facilitated.
Preferably, the karst pipeline is formed by splicing a plurality of pipeline sections, the branch pipeline is connected at the splicing position through the tee joint 1-5, specifically, one of the two adjacent pipeline sections is connected with one port of the tee joint through the movable screw 1-6, the other port of the tee joint is connected with the other pipeline section through the movable screw, and the third port of the tee joint is connected with the branch pipeline.
In this embodiment, the pressure detection spare is all installed to the bottom mid portion of every pipeline section, install the pressure detection spare on the branch road pipeline as well, the pressure detection spare adopts water flow pressure sensor 1-7, water flow pressure sensor is connected with control system, can give control system with the pressure information transmission who detects the acquisition, and is preferred, water flow pressure sensor passes through control system and is connected with paperless record appearance, and paperless record appearance passes through the data line and is connected with the host computer, can directly draw water flow pressure-time change curve, flow-time change curve through the software that the host computer installed.
In the embodiment, pipe network water stop valves 1-8 are arranged on each pipe section of the karst pipeline, and pipe network water stop valves are arranged on the branch pipelines.
Through pipe network water stop valve, the circulation condition of different pipelines can be controlled.
The pipe network water stop valves of all branch pipelines are closed, so that the flow distribution conditions and grouting reinforcement effects of karst pipelines with different pipe diameters can be simulated, and the flow distribution and reinforcement conditions of the whole karst pipeline during the drilling grouting reinforcement of the main karst pipeline, the secondary karst pipeline and the micro karst pipeline are respectively closed.
In this embodiment, an image acquisition element is disposed on one side of the karst pipeline, preferably, the image acquisition element adopts high definition cameras 1-9, and the high definition cameras are connected with a control system, and can acquire images of hydraulic plugging conditions of grouting materials in the karst pipeline and transmit the images to the control system.
The ends of the main karst pipeline, the secondary karst pipeline and the micro karst pipeline are connected with an input main pipe 2, and the input main pipe is connected with a water supply mechanism and a grouting mechanism.
The water supply mechanism 3 comprises a pressure-bearing water tank 3-1, the pressure-bearing water tank is provided with a water inlet, the water inlet is connected with a water supply pump 3-2 through a pipeline, the water supply pump is connected with a water supply tank 3-3, the water supply tank is used for containing water, and the water supply pump can drive water in the water supply tank to enter the pressure-bearing water tank.
The pressure-bearing water tank is also provided with an air inlet, the air inlet is connected with an air compressor 3-4 through a pipeline, the air compressor can introduce gas with set pressure into the pressure-bearing water tank through the pipeline and the air inlet, a pressure controller 3-5 is arranged on the pipeline between the air compressor and the pressure-bearing water tank, and the pressure controller is connected with the air compressor through a data line and is used for controlling the pressure of the gas introduced into the pressure-bearing water tank by the air compressor. The pressure in the pressure-bearing water tank is controlled, so that the water pressure in the karst pipe network is regulated, and the stability of the water pressure in the karst pipe network is ensured.
The pressure-bearing water tank is provided with a water outlet, the water outlet is connected with the input main pipe through a pipeline, and after the air compressor introduces air into the pressure-bearing water tank, the water in the pressure-bearing water tank can be driven to flow out from the water outlet to enter the input main pipe and further enter the karst pipe network.
Preferably, the pipeline adopts a water delivery hose, a water flow sensor 3-6 and a flow valve 3-7 are arranged on the pipeline between the water outlet of the pressure-bearing water tank and the input main pipe, the flow sensor is connected with a control system and used for detecting the flow of water entering a karst pipe network, and the flow valve is used for adjusting the flow of water entering the karst pipe network.
The grouting mechanism 4 comprises a pressure testing machine, preferably, the pressure testing machine adopts the existing universal pressure testing machine 4-1, and comprises a main body frame, a loading driving piece, a pressure head connected with the loading driving piece and other elements, and the specific structure of the pressure testing machine is not described in detail herein.
The stirring device is characterized in that a guide rail is arranged below the pressure head and is in sliding connection with the stirring tank 4-2, the stirring tank can be horizontally pulled and is convenient to charge and rinse, a stirring assembly is arranged in the stirring tank and comprises a rotating rod 4-3, the central part of the rotating rod is in sealed rotating connection with the bottom shell wall of the stirring tank, a plurality of stirring shafts 4-4 are arranged on the rotating rod, the rotating rod can drive the stirring shafts to move so as to stir slurry in the stirring tank, the rotating rod is connected with a power mechanism, the power mechanism comprises a transmission mechanism and a driving piece, the transmission mechanism adopts the existing belt transmission mechanism 4-5 and is arranged on a mounting plate at the bottom of the stirring tank and comprises a driving pulley, a driven pulley and a driving belt which is connected between the driving pulley and the driven pulley in a winding manner, and the driving piece is arranged on the mounting plate and preferably adopts a driving motor 4-6. The driven belt wheel is connected with the rotating rod through the wheel shaft and can drive the rotating rod to rotate.
Preferably, the pressure head 4-7 of the universal pressure testing machine is provided with an exhaust pipe 4-8, the exhaust pipe is provided with an exhaust valve, air in the stirring tank can be exhausted in the downward moving process of the pressure head, and then after grouting is completed, the residual materials in the stirring tank can be pressed out through the exhaust pipe to facilitate cleaning.
The universal pressure testing machine is connected with the control system, can work under the control of the control system, has control modes such as constant-speed experimental force, constant-speed stress, experimental force maintenance and the like, and can perform constant-pressure grouting and constant-current grouting. The stirring shaft stirs and mixes the raw materials to obtain a mixture with expected consistency, and the slurry is kept at proper consistency in the grouting process. In the process of simulated grouting reinforcement, the grouting material is stirred by the stirring shaft, and simultaneously, the grouting material is uniformly injected into the karst pipeline network by the pressure head of the universal pressure testing machine at constant pressure or constant speed, so that slurry segregation and precipitation can be prevented and treated in the grouting process, and the uniform stability of the slurry injected into the karst pipeline network is ensured.
The stirring tank is provided with a discharge port, the discharge port is connected with an input main pipe through a pipeline, and the slurry in the stirring tank can be fed into the input main pipe through the discharge port and the pipeline to enter a karst pipe network.
And a grouting amount sensor 4-9 and a grouting pressure sensor 4-10 which are connected with the control system are arranged on a pipeline between the stirring tank and the input main pipe, and the grouting flow sensor and the grouting pressure sensor are respectively used for detecting grouting flow stack and grouting pressure and transmitting detected flow and pressure information to the control system. And a grouting water stop valve 4-11 is also arranged on a pipeline between the stirring tank and the input main pipe.
One end of the main karst pipeline, one end of the secondary karst pipeline and one end of the micro karst pipeline are connected with the input main pipe, the other end of the main karst pipeline, the secondary karst pipeline and one end of the micro karst pipeline are provided with the collecting mechanism, and water and slurry in the karst pipe network can flow into the collecting mechanism.
The collecting mechanism 5 comprises a collecting box 5-1, the collecting box is arranged on a collecting box bracket 5-2, a water outlet is formed in the bottom box wall of the collecting box, an overflow pipe 5-3 is arranged at the water outlet, the overflow pipe is positioned in the collecting box, the overflow pipe and the water outlet are coaxially arranged, and the overflow pipe is fixed on the bottom box wall of the collecting box and is perpendicular to the bottom box wall of the collecting box.
The discharge port is also connected with a rubber hose 5-4 which is arranged outside the collecting box and is used for discharging sewage in the collecting box.
The sewage in the karst pipeline network enters the collecting box, and due to the existence of the overflow pipe, the sewage is precipitated in the collecting box, and the granular materials are precipitated at the bottom of the collecting box.
In this embodiment, the control system is connected to the upper computer 6, so that information collected by each sensor can be displayed on the upper computer, and a worker can send an instruction to the control system through the upper computer.
The experimental device of the embodiment can simulate the flow distribution and diffusion blocking conditions of slurry in different karst pipelines in a karst pipeline network, can simulate the condition of blocking a broken zone of a water-containing karst pipeline network by using particle materials more truly, can effectively predict whether the filling condition of the karst pipeline in a rock body after the drilling grouting reinforcement of the karst pipelines with different pipe diameters reaches the expected strength after the reinforcement, accurately researches the diffusion mechanism of the particle materials in the water-containing structure and the mechanism of blocking water burst, provides a basis for establishing a relevant mathematical model and providing a grouting theory of blocking broken zone crack water burst and the like by using the particle materials, and provides a reference for engineering grouting blocking.
In this embodiment, the karst pipeline network is placed on backup pad 7, the backup pad is connected with a plurality of jacking pieces, utilizes the jacking piece to support, and is preferred, the jacking piece adopts screw jack 8, can adjust the karst pipeline network to the horizontality through a plurality of screw jacks.
The experimental device working method of the embodiment is as follows:
and connecting a pipeline connected with a discharge hole of the stirring tank with a grouting pipe, inserting the grouting pipe into a grouting hole formed in the input main pipe, and arranging a grouting pressure sensor and a grouting flow sensor.
According to geological conditions of the broken belt encountered in construction, the flow and the flow velocity of water burst, a pressure controller of a water supply mechanism is adjusted to provide dynamic water conditions similar to engineering, a dynamic water flow sensor and a water flow pressure sensor are arranged at the middle part of the bottom of each pipe section of the karst pipeline, a screw jack is adjusted, and an acrylic pipe is adjusted to be in a horizontal state.
The water outlet of the pressure-bearing water tank of the water supply mechanism is connected with the input main pipe through a pipeline, and a water flow sensor and a flow valve are arranged.
And connecting each arranged sensor to a data acquisition device, connecting the data material device to a control system, and setting acquisition frequency and data storage parameters through an upper computer.
Adding granular casting materials into the stirring tank, adjusting a pressure controller, providing different flowing water flow rates for the karst pipeline, starting a universal pressure testing machine after the flow rates are stable, and setting grouting pressure to be a preset value.
Keeping all the three water outlet ends at the right end of the karst pipeline network open, observing the flow distribution condition of slurry in the grouting reinforcement process in the whole karst pipeline network, continuously grouting, and observing whether the whole karst pipeline network can be completely filled;
stopping grouting when the particle grouting materials in the karst pipelines with three different pipe diameters are diffused to the boundary of the water outlet or when the particle grouting materials in the karst pipeline with a certain diameter are diffused to the boundary of the water outlet and the particle grouting materials in the karst pipeline with other diameters are not diffused any more or after the flowing water flow is completely blocked by the particle grouting materials; observing and monitoring and recording the hydraulic plugging condition of the granular grouting material under different flow rates in real time;
as shown in fig. 9, the pipe section of the karst pipeline as the plugging pressure test section is detached, and is connected with the water supply mechanism through a movable screw, after the connection is completed, water pressure is slowly applied to the granular plugging material in the pipe section, and the limit bearing capacity of the plugging section is tested, so that the plugging effect is quantitatively evaluated.
In the embodiment, the water supply mechanism is used for pressurizing the plugging slurry in the pipe section serving as the plugging pressure test section, and how much pressure is needed for punching the plugging slurry is measured, so that the integral bearing capacity of the whole karst pipeline network is calculated, and then the weak bearing area can be calculated.
And (3) disassembling, cleaning and reinstalling the experimental device, then sequentially closing the secondary karst pipeline and the micro karst pipeline, repeating the experimental steps, observing and recording the flow distribution condition of slurry in the grouting reinforcement process in the whole karst pipeline network when the karst pipelines with different pipe diameters are subjected to grouting reinforcement, continuously grouting, and observing whether the whole karst pipeline network can be completely filled.
Detaching and reinstalling karst pipelines with three different pipe diameters according to different positions, carrying out grouting reinforcement experiments again, and observing and recording flow distribution and filling conditions of slurry in the whole karst pipeline network when the positions are different;
the influence of flowing water flow rate, grouting pressure and particle material consumption on the flow distribution condition and grouting reinforcement effect of karst pipelines with different pipe diameters can be obtained by changing different experimental conditions.
While the foregoing description of the embodiments of the present application has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the application, but rather, it is intended to cover all modifications or variations within the scope of the application as defined by the claims of the present application.
Claims (7)
1. The experimental device for simulating water burst blocking of the karst pipeline network is characterized by comprising a plurality of karst pipelines, wherein two adjacent karst pipelines are connected through a branch pipeline to form a karst pipeline network, the karst pipelines of the karst pipeline network have various dimensions, one end of the karst pipeline network is connected with a water supply mechanism and a grouting mechanism, the other end of the karst pipeline network is provided with a collecting mechanism, and pressure monitoring pieces and water stop valves are arranged on the karst pipeline and the branch pipeline;
the karst pipeline is formed by splicing a plurality of pipe sections, and each pipe section is provided with a pressure monitoring piece and a water stop valve; the karst pipeline is formed by splicing a plurality of pipe sections, and branch pipelines are connected at splicing positions;
the grouting mechanism comprises a pressure testing machine, a stirring tank is arranged below a pressure head of the pressure testing machine, a stirring assembly connected with a power mechanism is arranged in the stirring tank, and a discharge hole of the stirring tank is connected with a karst pipeline network;
the ends of karst pipelines with various dimensions of the karst pipeline network are connected with an input main pipe, the input main pipe is connected with a water supply mechanism and a grouting mechanism, the stirring tank is provided with a discharge port, and the discharge port is connected with the input main pipe through a pipeline;
a grouting amount sensor and a grouting pressure sensor which are connected with a control system are arranged on a pipeline between the stirring tank and the input main pipe;
a grouting water stop valve is also arranged on a pipeline between the stirring tank and the input main pipe;
the pressure testing machine is characterized in that a guide rail is arranged below the pressure head of the pressure testing machine, the stirring tank is connected with the guide rail in a sliding mode, and the stirring tank can move to a position right below the pressure head or away from the position right below the pressure head through the guide rail.
2. The experimental device for simulating water burst plugging of a karst pipeline network according to claim 1, wherein the water supply mechanism comprises a pressure-bearing water tank, the pressure-bearing water tank is connected with a water supply pump through a pipeline, the water supply pump is connected with a water supply tank through a pipeline, the pressure-bearing water tank is further connected with an air compressor through a pipeline, and a water outlet of the pressure-bearing water tank is connected with the karst pipeline network.
3. The experimental device for simulating water burst plugging of karst pipeline network according to claim 2, wherein a pressure controller is further installed on the pipeline between the air compressor and the pressure-bearing water tank.
4. The experimental device for simulating water burst plugging of karst pipeline network according to claim 1, wherein the pressure head of the pressure testing machine is provided with an exhaust pipe, and the exhaust pipe is provided with an exhaust valve.
5. The simulated karst pipeline network water burst shutoff experiment device of claim 1, wherein the karst pipeline network is placed on a support plate, the support plate is connected with a plurality of jacking members, and the jacking members are used for adjusting the height of the support plate.
6. The experimental device for simulating water burst plugging of karst pipeline network according to claim 1, wherein the collecting mechanism comprises a collecting box, a water outlet is arranged at the bottom of the collecting box, and an overflow pipe arranged in the collecting box is arranged at the water outlet.
7. The experimental device for simulating water burst plugging of a karst pipeline network according to claim 1, wherein the karst pipeline and the branch pipeline are made of transparent materials, and an image acquisition element is arranged on one side of the karst pipeline.
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