High head dynamic water-seepage-chemical coupling anti-seepage curtain accelerated corrosion test system

Abstract

The present application relates to a kind of high water head dynamic water-seepage-chemical coupling's anti-seepage curtain accelerated dissolution test system, including the flow passage body of three-way structure, one place opening is as installation mouth, the structure of installation mouth is compatible with the structure of sample, through sample complete filling installation mouth, the other two openings are respectively towards horizontal two sides as water inlet and water outlet, the water inlet and water outlet of flow passage body are connected with circulating pump assembly by infusion tube and water tank and form circulating loop, valve is connected on infusion tube.The present application introduces dynamic water circulating loop and steady-state flexible control mechanism, not only improves the stability and repeatability of dissolution test, but also can effectively improve the efficiency and precision of dissolution simulation, provides reliable test platform for seepage-chemical coupling research of anti-seepage curtain body in high water head environment, and provides technical support for the design improvement and durability analysis of anti-seepage system, solves the problem of large dissolution rate fluctuation, long test cycle, single simulation condition.

Description

Technical Field

[0001] This invention relates to the field of anti-seepage curtain corrosion testing technology, specifically to an accelerated corrosion testing system for anti-seepage curtains with high water head dynamic water-seepage-chemical coupling. Background Technology

[0002] In long-term service and high-head hydraulic environments, continuous seepage and chemical interactions occur between groundwater and the seepage barrier. Ions dissolved in the high-pressure fluid continuously participate in material exchange and chemical reactions during the seepage process, causing the internal structure of the seepage barrier to gradually evolve, exhibiting characteristics such as pore expansion, weakened cementation, and increased permeability. This phenomenon of seepage barrier performance degradation caused by seepage-chemical coupling has been observed multiple times in hydraulic engineering projects such as high-head water conveyance tunnels and dam foundations, posing potential risks to the overall operational safety of the project and the service reliability of the seepage barrier.

[0003] Due to the complex on-site environment, long monitoring period, and numerous influencing factors, existing research methods are insufficient to accurately reveal the seepage dissolution behavior and structural evolution of cut-off curtains under high head and multi-field coupling effects. Currently, various experimental devices have been constructed both domestically and internationally for studying the dissolution behavior of materials, such as deionized water immersion accelerated tests, high-pressure seepage reaction systems, chemical solution interaction experiments, and electrochemical dissolution accelerated platforms. However, these devices generally suffer from limited simulation conditions, making it difficult to simultaneously control fluid pressure, flow rate, and chemical reaction processes under high head conditions. This prevents them from accurately reflecting the performance changes of the cut-off curtain body under the combined effects of multiple factors. Furthermore, during the experiments, the accumulation of dissolution products and changes in chemical conditions often lead to fluctuations in the system's pH value and ion concentration, causing the dissolution rate to decay over time. The long experimental periods also make it difficult to maintain a continuous and stable dissolution process. Summary of the Invention

[0004] The purpose of this invention is to provide an accelerated dissolution test system for a high-head dynamic water-seepage-chemical coupling seepage barrier curtain, addressing the shortcomings of existing technologies. By introducing a dynamic water circulation loop and a steady-state flexible control mechanism, it not only improves the stability and repeatability of the dissolution test, but also effectively enhances the efficiency and accuracy of dissolution simulation. This provides a reliable test platform for the study of seepage-chemical coupling in seepage barrier curtains under high-head environments, and provides technical support for the design improvement and durability analysis of seepage barrier systems. It solves the problems of frequent solution replacement, large fluctuations in dissolution rate, long test cycles, and limited simulation conditions in traditional test devices.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-head dynamic water-seepage-chemical coupling seepage curtain accelerated corrosion test system includes a three-way flow channel body, one of which has a vertically upward opening as an installation port for mounting the sample. The structure of the installation port matches the structure of the sample, and the sample completely fills the installation port. The other two openings face horizontally and serve as inlet and outlet water outlets, respectively. The inlet and outlet water outlets of the flow channel body are connected to a water tank for storing the corrosion solution and a circulation pump assembly for providing pressurized delivery power through a liquid delivery pipe to form a circulation loop. A valve for controlling the on / off state of the circulation loop is connected to the liquid delivery pipe.

[0007] Furthermore, the flow channel body is made of rubber.

[0008] Furthermore, it also includes a frame, on which a mounting groove corresponding to the structure of the flow channel body is provided, and the flow channel body is disposed in the mounting groove.

[0009] Furthermore, it also includes an adjustment component for adjusting the local cross-sectional area of ​​the flow channel body. The mounting groove has a vertical through hole on the side opposite to the mounting opening, and the adjustment component is connected to the flow channel body through the through hole.

[0010] Furthermore, the adjustment assembly includes an adjustment member that is slidably connected to the frame in the vertical direction, the upper part of the adjustment member being connected to the flow channel body, and the lower part of the adjustment member being connected to a drive mechanism for driving the adjustment member to slide in the vertical direction.

[0011] Furthermore, the drive mechanism is a hydraulic push rod mounted on the frame.

[0012] Furthermore, a first flow meter and a first pressure sensor are connected to the infusion pipe between the circulating pump assembly and the inlet.

[0013] Furthermore, a second flow meter and a second pressure sensor are provided at the water inlet.

[0014] Furthermore, a third flow meter and a third pressure sensor are provided below the mounting port.

[0015] Furthermore, a fourth flow meter and a fourth pressure sensor are provided at the water outlet.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention overcomes the limitations of traditional experimental devices in simulating high-head environments and controlling multi-factor coupling. It constructs a comprehensive experimental platform for studying the dissolution behavior of seepage curtain materials. This system can reproduce complex hydrogeological environments under controllable conditions, realizing the accelerated dissolution process of the seepage curtain body under the combined influence of high-head dynamic water, seepage, and chemical processes. It is suitable for studying the material durability of seepage curtains under high-head and chemical dissolution conditions, providing verifiable experimental support for the optimized design and engineering application of seepage prevention structures.

[0018] This system maintains a solution concentration gradient and reaction driving force in a stable flow environment through a coupling mechanism of dynamic water circulation, pressure seepage, and chemical reaction. The dissolving solution undergoes ion exchange reactions with the calcium components in the impermeable curtain sample, promoting the continuous dissolution of calcium ions and forming a sustained dissolution process. Furthermore, the dissolving solution is continuously renewed in the circulation loop, maintaining a stable chemical environment and constant reaction conditions, thus reproducing the steady-state dissolution reaction under natural conditions with sufficient solution and constant chemical state. Simultaneously, the flowing dissolving solution promotes the migration and discharge of dissolution products, preventing local ion supersaturation and maintaining a large concentration difference, thereby sustaining chemical potential difference-driven continuous dissolution. In addition, the high head pressure causes the dissolving solution to penetrate into the internal pores of the sample, accelerating solute migration and pore expansion. The combined effect of multiple factors allows changes in the sample's microstructure to manifest within a short period, achieving controllable accelerated simulation and significantly improving experimental efficiency and data accuracy.

[0019] This system possesses independent controllability over key parameters such as flow rate, pressure, and solvent concentration, allowing for flexible setting of operating conditions according to experimental protocols. Through periodic solvent replacement and fluid circulation design, it effectively avoids rate attenuation caused by calcium ion accumulation, thus maintaining a long-term stable reaction state and ensuring the continuity and controllability of the dissolution process. High-pressure seepage loading and adjustment of the flow channel cross-section enable precise regulation of water pressure and flow rate. The system also integrates a real-time monitoring and data acquisition module, which can simultaneously record changes in solvent composition and fluid parameters, providing reliable data for dissolution process analysis and model verification. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the overall structure of the frame portion in this invention;

[0022] Figure 3 This is a cross-sectional view of the frame portion in this invention;

[0023] Figure 4 This is a schematic diagram of the component structure of the flow channel body in this invention;

[0024] Figure 5 This is a schematic diagram of the component structure above the frame in this invention;

[0025] Figure 6 This is a schematic diagram of the component structure below the frame in this invention.

[0026] The attached figures are labeled as follows:

[0027] 1. Flow channel body; 11. Mounting port; 12. Inlet; 13. Outlet; 2. Sample; 3. Frame; 31. Through hole; 32. Mounting groove; 4. Cover; 5. Adjusting component; 6. Hydraulic push rod; 7. Water tank; 8. Circulation pump assembly; 81. Air-driven hydraulic pump; 82. Air compressor; 83. Pressure reducing valve; 84. Air source switch; 85. Air supply pipe; 90. First hydraulic valve; 91. Second hydraulic valve; 92. First flow meter; 93. First pressure sensor; 94. Second flow meter; 95. Second pressure sensor; 96. Third flow meter; 97. Third pressure sensor; 98. Fourth flow meter; 99. Fourth pressure sensor; 10. Infusion pipe; 101. Pressure relief valve. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0032] For easier understanding, please refer to Figures 1 to 6 This embodiment provides a high-head dynamic water-seepage-chemical coupling seepage curtain accelerated corrosion test system, including a flow channel body 1 made of corrosion-resistant rubber material. The flow channel body 1 has a T-shaped three-way structure, with one opening facing vertically upward as the installation port 11, and the other two openings facing horizontally on both sides. The sample 2 is fixedly installed in the installation port 11. Furthermore, the structure of the installation port 11 fits the structure of the sample 2. Utilizing the properties of the rubber material, the sample 2 is interference-fitted with the sample 2, so that the sample 2 completely fills and seals the installation port 11. The other two openings serve as the inlet 12 and outlet 13 of the flow channel body 1, so that when the corrosion solution circulates laterally in the flow channel body 1, the corrosion solution can contact the bottom of the sample 2 and penetrate into the pores of the sample 2 to react. Specifically, if sample 2 is a cube structure of 10cm×10cm×10cm, then the mounting port 11 is a square cavity of 10cm×10cm×10cm. Preferably, the axial cross section of the flow channel 1 is 10cm×10cm. The outlet 13 of the flow channel 1 is connected to the water tank 7 via a water supply pipe. The water tank 7 stores a dissolving solution, specifically an ammonium nitrate solution. The inlet 12 of the flow channel 1 is connected to the circulation pump assembly 8 via a water supply pipe. The circulation pump assembly 8 is used to provide power for the circulation of the dissolving solution. Specifically, the circulation pump assembly 8 includes a high-precision air-driven hydraulic pump 81 and an air compressor 82. The air-driven hydraulic pump 81 and the air compressor 82 are connected via an air supply pipe 85. A pressure reducing valve 83 and an air source switch 84 are installed on the air supply pipe 85. The water tank 7 and the air-driven hydraulic pump 81 are connected via a liquid supply pipe 10. That is, the flow channel 1, the water tank 7, and the air-driven hydraulic pump 81 are connected via the liquid supply pipe 10 to form a circulation loop. A valve is connected to the infusion pipe 10 to control the on / off state of the circulation loop. Specifically, the valve includes a first hydraulic valve 90 and a second hydraulic valve 91. The first hydraulic valve 90 is installed on the infusion pipe 10 between the inlet 12 and the pneumatic hydraulic pump 81, and the second hydraulic valve 91 is installed on the infusion pipe 10 between the pneumatic hydraulic pump 81 and the water tank 7. Furthermore, a pressure relief valve 101 is installed on the infusion pipe 10 between the outlet 13 of the flow channel body 1 and the water tank 7.

[0033] A first velocity meter 92 and a first pressure sensor 93 are connected to the delivery pipe 10 between the pneumatic hydraulic pump 81 and the inlet 12 of the flow channel body 1. The first pressure sensor 93 and the first velocity meter 92 are used to monitor the pressure and flow rate at the outlet of the pneumatic hydraulic pump 81 in real time. The data is mainly used to verify the working performance of the pump itself and whether the total energy input of the system is normal. A second velocity meter 94 and a second pressure sensor 95 are installed at the inlet 12 of the flow channel body 1. The second pressure sensor 95 and the second velocity meter 94 are used to monitor the pressure and flow rate at the interface closest to the sample 2. This set of data is the most direct basis for judging whether the target working conditions (target head and flow rate) have been achieved, and it is also the core reference for subsequent adjustments. A third velocity meter 96 and a third pressure sensor 97 are installed directly below the mounting port 11. The third pressure sensor 97 and the third velocity meter 96 monitor the pressure and flow rate at sample 2. By comparing this data with the data at the inlet 12 (i.e., the data collected by the second velocity meter 94 and the second pressure sensor 95), the actual head difference (pressure drop) experienced by sample 2 during the test can be directly calculated, which is crucial for analyzing the permeability evolution of sample 2. A fourth velocity meter 98 and a fourth pressure sensor 99 are installed at the outlet 13 of the flow channel 1. The fourth pressure sensor 99 and the fourth velocity meter 98 monitor the pressure and flow rate at the end of the circulation loop, just before returning to the water tank 7. This data is used to verify the stability of the entire circulation system and the energy loss, ensuring that the loop is free from blockages or abnormal leaks. The system also includes a controller, which controls various electronic components and receives feedback signals in real time. Specifically, the second velocity meter 94 and the second pressure sensor 95, the third velocity meter 96 and the third pressure sensor 97, and the fourth velocity meter 98 and the fourth pressure sensor 99 are all installed on the outside of the frame 3, and their detection probes pass through the frame 3 and the flow channel 1 in sequence and extend into the interior of the flow channel 1.

[0034] The frame 3 has a T-shaped mounting groove 32 corresponding to the flow channel body 1, and the flow channel body 1 is installed in the mounting groove 32. A cap 4 is detachably connected to the frame 3 at the position corresponding to the mounting port 11 of the flow channel body 1. The cap 4 completely presses the flow channel body 1 into the mounting groove 32, ensuring that the flow channel body 1 completely fills and seals the mounting port 11, ensuring that the circulating etchant can contact the bottom of the sample 2 and penetrate into the pores of the sample 2 for reaction. An adjustment component is installed at the lower part of the frame 3, and a vertical through hole 31 is provided at the lower part of the mounting groove 32. The through hole 31 corresponds to the position of the mounting port 11 of the flow channel body 1, that is, the through hole 31 is located directly below the mounting port 11. The adjustment component is connected to the bottom of the flow channel body 1 through the through hole 31. Specifically, the cross-sectional area of ​​the through hole 31 is larger than the cross-sectional area of ​​the mounting port 11. The adjustment assembly includes an adjustment member 5, which is slidably connected to the through hole 31 in the vertical direction. The upper part of the adjustment member 5 is fixedly connected to the bottom of the flow channel body 1, and the lower part of the adjustment member 5 is connected to the drive mechanism. The drive mechanism is used to drive the adjustment member 5 to slide in the vertical direction. Furthermore, the drive mechanism is a hydraulic push rod 6 fixedly installed on the bottom of the frame 3. The piston rod of the hydraulic push rod 6 is connected to the bottom of the adjustment member 5. Furthermore, there are multiple hydraulic push rods 6, which together smoothly drive the adjustment member 5 to slide in the vertical direction. Specifically, during the test, because the erosion solution continuously circulates inside the rubber channel body 1, there is always water pressure inside the channel body 1. Therefore, when the adjusting component 5 slides upward to lift the bottom of the channel body 1, the remaining part of the channel body 1 (the part not connected to the adjusting component 5) will not deviate significantly from its original installation position. More specifically, in the actual manufacturing process, after the channel body 1 is installed and inserted into the mounting slot 32 of the frame 3, processes such as dispensing and screw connection can be used to fix the three extended ends of the channel body 1 (i.e., the outer end of the mounting port 11, the outer end of the inlet 12, and the outer end of the outlet 13) to the frame 3 respectively. This ensures that when the adjusting component 5 slides upward to lift the bottom of the channel body 1, the fixing connection process can work in conjunction with the water pressure inside the channel body 1 to keep the remaining part of the channel body 1 stationary in its original installation position.

[0035] The experimental steps of this invention are as follows:

[0036] 1. System Preparation and Sample 2 Pretreatment: Open pressure relief valve 101 to ensure the initial system pressure matches the ambient atmospheric pressure. Add sufficient 5 mol / L ammonium nitrate solution to water tank 7 and confirm that all pipeline connections are securely sealed. Select a standard waterproof curtain sample 2 with dimensions of 10cm × 10cm × 10cm, clean its surface to remove dust and impurities, and then allow it to air dry in a ventilated environment. If the surface of sample 2 is noticeably uneven, it can be lightly polished. After treatment, confirm that sample 2 is intact, without visible cracks or other defects, and store it in a dry and clean place for later use.

[0037] 2. Sample 2 Encapsulation: The pre-treated sample 2 is snapped into the mounting port 11 of the flow channel body 1, ensuring the sample 2 completely fills the port 11. The bottom of the sample 2 can be considered as the inner wall of the flow channel body 1, ensuring the sample 2 is stably clamped and forms a reliable waterproof seal under high test pressure. A cap 4 is installed at the mounting port 11, and two sets of fastening bolts are tightened evenly in a symmetrical sequence, ensuring the sample 2 completely fills the mounting port 11. A thorough inspection of the air and water circuits is conducted to confirm they are functioning correctly.

[0038] 3. Dissolution and seepage loading:

[0039] 3.1 System Start-up and Initial Pressure Build-up: First, based on the preset target flow rate and head pressure, and combining the fluid energy balance and flow continuity relationship, the initial test parameters are calculated and set in the controller. Then, the air source switch 84 is turned on, and the air compressor 82 is started. The output air pressure is stabilized at the set value by adjusting the pressure reducing valve 83, providing a stable driving force for the air-driven hydraulic pump 81. After preparation, the air-driven hydraulic pump 81 is started through the controller, and the opening of the first hydraulic valve 90 and the second hydraulic valve 91 is slowly adjusted, allowing the ammonium nitrate solution to begin circulating within the system, contacting the bottom of the sample 2 and penetrating into the pores of the sample 2 to undergo a chemical reaction.

[0040] 3.2 Precise Parameter Control and Steady-State Maintenance: Based on real-time data feedback from four sets of sensors (first velocity meter 92 and first pressure sensor 93, second velocity meter 94 and second pressure sensor 95, third velocity meter 96 and third pressure sensor 97, fourth velocity meter 98 and fourth pressure sensor 99) to the controller, the power output of the pneumatic hydraulic pump 81 and the opening of the first hydraulic valve 90 and the second hydraulic valve 91 are dynamically and finely adjusted on the controller to precisely control system pressure and flow rate. Simultaneously, according to experimental requirements, the controller can activate the hydraulic push rod 6 to drive the adjusting component 5 to make a slight vertical displacement, thereby adjusting the local cross-sectional area of ​​the flow channel 1, conforming to the principle of continuous flow, and helping to form a more stable flow state upstream and downstream of the sample 2.

[0041] 3.3 Safety Monitoring and Data Recording: Throughout the experiment, the status of the pressure relief valve 101 must be monitored in real time to ensure it remains in a ready and normal state. This is crucial to prevent abnormal pressure increases in the system due to unforeseen circumstances and to ensure the safety of equipment and personnel. Throughout the experiment, data from the four sets of sensors are continuously or automatically recorded at regular intervals via the controller, providing complete and reliable experimental data support for subsequent dissolution mechanism analysis and model verification.

[0042] 4. Solution Replacement and Circulation Maintenance: To prevent the chemical reaction rate from decreasing due to the continuous increase in calcium ion concentration caused by the reaction of ammonium nitrate solution with sample 2 during long-term experiments, the solution needs to be replaced periodically to maintain a constant driving force for chemical corrosion. During replacement, first stop the pneumatic hydraulic pump 81 via the controller, then turn off the air source switch 84 to stop the air compressor 82, and slowly open the pressure relief valve 101 to safely release the internal pressure of the system to atmospheric pressure. Next, close the first hydraulic valve 90 and the second hydraulic valve 91 to isolate the reaction circuit from the water tank 7. Drain the old ammonium nitrate solution from the water tank 7, clean the water tank 7 appropriately, and then refill it with freshly prepared, accurately concentrated 5 mol / L ammonium nitrate solution. Return all valves to their operating state, close the pressure relief valve 101, restart the air compressor 82 and the pneumatic hydraulic pump 81, and re-establish and calibrate to the target steady-state test conditions according to step 3.1. Each time the solution in the water tank 7 is replaced, it must be noted in the test record, and the relevant test parameters must be updated.

[0043] 5. Specimen Removal and Analysis: After the test, first, gradually reduce the power of the pneumatic hydraulic pump 81 to zero using the controller and then shut it off. Next, turn off the air source switch 84 to stop the air compressor 82. After confirming that the pneumatic hydraulic pump 81 has completely stopped, slowly open the pressure relief valve 101 to ensure that all residual pressure in the system is completely released. After the pressure reaches zero, loosen and remove the fastening bolts in sequence, and carefully remove the cap 4. Carefully remove the specimen 2 from the mounting port 11 of the flow channel 1, avoiding mechanical damage or contamination to the bottom (already etched surface) of the specimen 2 during the operation. Immediately rinse the removed specimen 2 gently and thoroughly with deionized water to remove any surface-adhered reaction residues and solution crystals, and then dry it at low temperature. The dried specimen 2 is used for subsequent characterization work such as macroscopic morphology observation, microstructure analysis, and etching depth determination to comprehensively evaluate its performance degradation characteristics and etching mechanism.

[0044] This invention uses a 5 mol / L ammonium nitrate solution as the reaction medium and utilizes dynamic water circulation to maintain a stable concentration of active ions in the solution, thereby maintaining continuous reaction conditions and accelerating the dissolution process. Through the synergistic regulation of external fluid circulation, high-head seepage, and the chemical reaction environment, the system can realize the accelerated dissolution and controllable evolution simulation of the seepage barrier material under high hydraulic gradient conditions. Its acceleration mechanism mainly includes the following aspects:

[0045] (1) Chemical reaction dissolution: Ammonium ions in the ammonium nitrate solution undergo ion exchange reaction with the calcium components in the curtain material, causing calcium ions to continuously dissolve and enter the liquid phase, thereby weakening the cementing structure of the curtain material and promoting the continuous progress of the dissolution process. This chemical reaction continuously changes the chemical composition and pore structure inside the curtain body, and is one of the main driving forces of dissolution evolution.

[0046] (2) High head seepage driving effect: Under high head pressure conditions, the leaching solution contacts and penetrates into the interconnected pores of the curtain material, promoting solute migration and diffusion, accelerating the discharge of leaching products, and driving the gradual development and interconnection of the pore structure. During the seepage process, hydraulic action and chemical reaction interact, which continuously enhances the permeability of the material and gradually reduces the density of the structure, showing an evolutionary trend from local dissolution to penetrating leaching.

[0047] (3) Accelerating effect of dynamic water circulation: The system continuously replaces and replenishes the dissolving solution through external circulation, keeping the calcium ion concentration in the pores at a low level, thereby maintaining a high chemical potential difference and concentration gradient, avoiding local solution saturation, and ensuring the continuity and uniformity of the dissolution reaction. The combined effect of dynamic water circulation and high head seepage forms a stable chemical-hydraulic coupling effect, which carries out the dissolution products in the circulation flow, accelerating the structural evolution and performance degradation process of the seepage barrier material under controllable conditions.

[0048] Through the coupling effect of the above three mechanisms, this invention can reproduce the long-term dissolution evolution process of the seepage barrier under high water head and complex flow chemical environment in the laboratory, realize the controllable accelerated simulation of the seepage barrier dissolution process, and provide a reliable experimental platform and data support for analyzing the changes in its durability, permeability and service performance.

[0049] To ensure that the system has a controllable high head and stable flow state during the test, the present invention incorporates the principles of fluid energy balance and continuous flow to dynamically adjust the flow rate and pressure of the circulation system.

[0050] Under ideal steady-state flow conditions, the energy per unit mass of the fluid at different cross sections can be considered a constant, and can be expressed as:

[0051]

[0052] in, For fluid pressure, For density, The flow rate is represented by the flow velocity. This energy relationship reveals the interconversion characteristics of fluid pressure energy and kinetic energy: at a given flow rate, if the system pressure increases, the flow velocity decreases accordingly; conversely, increasing the flow velocity requires additional energy input. By adjusting the output power of the circulating pump and the pipeline structure, energy redistribution can be achieved, thereby precisely controlling the flow velocity and pressure.

[0053] At the same time, according to the principle of flow conservation, the system satisfies the continuity relationship:

[0054]

[0055] in, For traffic, The cross-sectional area of ​​the channel. The velocity is represented by the cross-sectional area. This relationship illustrates that, with a constant total flow rate, changes in cross-sectional area directly affect the local velocity distribution. The system achieves combined regulation of head pressure and flow state through a coordinated approach of pump flow rate adjustment and channel cross-section control, thereby creating a stable dynamic water circulation environment and ensuring the repeatability and controllability of the dissolution process.

[0056] This invention constructs a high-head dissolution simulation platform that can maintain stable operating conditions for a long time by coupling dynamic water circulation, pressure seepage and chemical reaction. It can realistically reproduce the dissolution evolution process of the anti-seepage curtain under complex hydrochemical conditions, and provide a reliable experimental basis and technical support for the study of curtain performance degradation law and engineering durability assessment.

[0057] Although the present invention has been described using the above preferred embodiments, it is not intended to limit the scope of protection of the present invention. Any changes and modifications made by those skilled in the art to the above embodiments without departing from the spirit and scope of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A high-head dynamic water-seepage-chemical coupling anti-seepage curtain accelerated dissolution test system, characterized in that, The flow channel body (1) includes a three-way structure, one of which has an opening facing vertically upward as an installation port (11) for installing a sample (2). The structure of the installation port (11) matches the structure of the sample (2), and the sample (2) completely fills the installation port (11). The other two openings face horizontally as an inlet (12) and an outlet (13). The inlet (12) and outlet (13) of the flow channel body (1) are connected to a water tank (7) for storing the etch solution and a circulation pump assembly (8) for providing pressurized delivery power through a liquid delivery pipe (10) to form a circulation loop. A valve for controlling the on / off state of the circulation loop is connected to the liquid delivery pipe (10). The flow channel body (1) is made of rubber. It also includes a frame (3), on which a mounting groove (32) corresponding to the structure of the flow channel body (1) is provided, and the flow channel body (1) is set in the mounting groove (32); It also includes an adjustment component for adjusting the local cross-sectional area of ​​the flow channel body (1). The mounting groove (32) has a vertical through hole (31) on the side opposite to the mounting port (11). The adjustment component is connected to the flow channel body (1) through the through hole (31). The adjustment assembly includes an adjustment member (5) that is slidably connected to the frame (3) in the vertical direction. The upper part of the adjustment member (5) is connected to the flow channel body (1), and the lower part of the adjustment member (5) is connected to a drive mechanism for driving the adjustment member (5) to slide in the vertical direction. The driving mechanism is a hydraulic push rod (6) mounted on the frame (3).

2. The high-head dynamic water-seepage-chemical coupling anti-seepage curtain accelerated dissolution test system according to claim 1, characterized in that, A first flow meter (92) and a first pressure sensor (93) are connected to the inlet pipe (10) between the circulating pump assembly (8) and the inlet (12).

3. The high-head dynamic water-seepage-chemical coupling anti-seepage curtain accelerated dissolution test system according to claim 1, characterized in that, A second flow meter (94) and a second pressure sensor (95) are provided at the water inlet (12).

4. The high-head dynamic water-seepage-chemical coupling anti-seepage curtain accelerated dissolution test system according to claim 1, characterized in that, A third flow meter (96) and a third pressure sensor (97) are provided below the mounting port (11).

5. The high-head dynamic water-seepage-chemical coupling anti-seepage curtain accelerated dissolution test system according to claim 1, characterized in that, A fourth flow meter (98) and a fourth pressure sensor (99) are provided at the outlet (13).

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