Diaphragm wall performance simulation test device and test method thereof

Abstract

This invention discloses a test device for simulating the performance of a cutoff wall, relating to the field of cutoff wall performance testing technology. It includes a stacked ring assembly and a shell assembly. The stacked ring assembly comprises at least two stacked ring bodies, each with a first hollow cavity. Multiple stacked ring bodies are stacked sequentially, and adjacent stacked ring bodies can move relative to each other in the horizontal direction. The stacked ring assembly is mounted on a base. The shell assembly comprises at least two shells, each with a second hollow cavity. Multiple shells are stacked sequentially on the stacked ring assembly. The second hollow cavities of the multiple shells and the first hollow cavities of the multiple stacked ring bodies are sequentially connected to form a forming cavity for forming a cutoff wall. Adjacent shells can move relative to each other in the horizontal direction. This invention also provides a corresponding method for simulating the performance of a cutoff wall. This invention improves work efficiency, enhances the realism and accuracy of the test, and has a simple structure, making it easy to apply.

Description

Technical Field

[0001] This invention relates to the field of anti-seepage wall performance testing technology, and in particular to an anti-seepage wall performance simulation test device and its test method. Background Technology

[0002] A cutoff core is a continuous cutoff wall constructed by drilling holes or excavating trenches in soft soil and then laying asphalt concrete. Asphalt concrete is widely used in water conservancy projects as a cutoff material due to its excellent impermeability, fast construction speed, strong adaptability to deformation, and good plasticity, especially as a core wall or cutoff panel in earth-rock dams. With the development of modern dam construction, suitable terrain for water conservancy projects is becoming increasingly scarce. Most dam sites are located in strongly weathered foundations, deep and weak overburden layers, or steep river valleys, which are unfavorable for the construction of earth-rock dams.

[0003] The connection between the core wall and the foundation is the most crucial part of the entire seepage control system of an earth-rock dam, directly determining the dam's seepage control safety. The concrete foundation is a rigid material, while asphalt concrete is a flexible material, bonded together with sandy asphalt mastic. Under complex terrain and geological conditions or high seismic intensity, the contact surface between the asphalt concrete core wall and the concrete foundation may experience significant shear deformation, potentially leading to the destruction of the entire seepage control system of the earth-rock dam. Under external forces, the contact surface between the core wall and the transition materials on both sides of the core wall may also experience shear deformation, potentially affecting the mechanical properties and seepage control performance of the asphalt concrete core wall. Therefore, whether the connections between the core wall and the foundation, and between the core wall and the transition materials on both sides of the core wall, meet the usage requirements requires testing with appropriate experimental equipment to verify the seepage control performance of the earth-rock dam.

[0004] Currently, the performance testing of anti-seepage walls is mostly based on numerical simulations using existing engineering data, lacking experimental evidence and failing to provide a strong reference for engineering construction. Summary of the Invention

[0005] The purpose of this invention is to provide a test device for simulating the performance of a cutoff wall, which solves the problems existing in the prior art and helps to improve work efficiency; it can load at various heights of the cutoff wall, can better reproduce the shear stress of the cutoff wall, and improve the authenticity and accuracy of the test; it has a simple structure, can be used for testing cutoff walls of various sizes, and is easy to apply.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a test device for simulating the performance of a seepage barrier wall, comprising a stacked ring assembly and a shell assembly, wherein:

[0008] The stacked ring assembly includes at least two stacked ring bodies, each stacked ring body having a first hollow cavity, and multiple stacked ring bodies are stacked sequentially, with adjacent stacked ring bodies capable of relative movement in the horizontal direction; the stacked ring assembly is used to be mounted on a base;

[0009] The outer shell assembly includes at least two shells, each shell having a second hollow cavity. A plurality of shells are stacked sequentially on the stacked ring assembly. The second hollow cavities of the plurality of shells and the first hollow cavities of the plurality of stacked ring bodies are sequentially connected to form a forming cavity. The forming cavity is used to form a seepage barrier wall. Two adjacent shells are capable of relative movement in the horizontal direction.

[0010] Preferably, each of the housings is provided with an observation window, and the molding cavity can be used to mold the core wall dam.

[0011] Preferably, two adjacent stacked ring bodies are rolled together; two adjacent housings are slidably connected.

[0012] Preferably, the end of each stacked ring body closest to the base is the first end of the stacked ring, and the end of each stacked ring body furthest from the base is the second end of the stacked ring. Both the first end and the second end of each stacked ring body are provided with a first track groove group. Each first track groove group includes two first track grooves arranged opposite each other. The two first track grooves at the second end of each stacked ring are respectively arranged opposite to the two first track grooves at the adjacent first end of the stacked ring. A plurality of balls are arranged between each first track groove at the second end of each stacked ring and the corresponding first track groove at the adjacent first end of the stacked ring.

[0013] Preferably, the end of each housing near the base is the first end of the housing, and the end of each housing away from the base is the second end of the housing. The first end of each housing is provided with at least two sliders, and the second end of each housing is provided with a second track groove group. Each second track groove group includes two second track grooves arranged opposite each other. The two second track grooves at the second end of each housing are slidably connected to at least one slider at the adjacent first end of the housing.

[0014] Preferably, each of the sliders is a bearing, and each of the second track grooves is slidably connected to at least two of the sliders.

[0015] Preferably, each of the housings includes a transparent plate, a first metal plate, a second metal plate, and a third metal plate that are fixedly connected in sequence.

[0016] This invention provides a method for simulating the performance of a cutoff wall based on the aforementioned cutoff wall performance simulation test device, comprising the following steps:

[0017] S1. Multiple stacked ring bodies are sequentially stacked on the base, and multiple shells are sequentially stacked on the stacked ring assembly, forming the seepage barrier wall through the forming cavity;

[0018] S2. Apply a lateral loading force to at least one of the multiple stacked bodies and multiple shells to obtain shear deformation data of the impermeable wall and / or the connection between the impermeable wall and the base.

[0019] Preferably, S2 includes: simultaneously applying a lateral loading force to the plurality of stacked bodies and the plurality of shells, and obtaining shear deformation data of the impermeable wall and / or the connection between the impermeable wall and the base.

[0020] Preferably, S1 further includes: S1 further includes: placing the water inlet pipe in the molding cavity before completing the installation of the stacked ring assembly and the outer shell assembly; then completing the installation of the stacked ring assembly and the outer shell assembly, molding the impermeable wall through the molding cavity, and positioning the water outlet of the water inlet pipe between the impermeable wall and the base;

[0021] S2 further includes: while applying a horizontal load to the seepage barrier, applying a vertical load force to the upper end of the seepage barrier, and pumping water into the inlet pipe to apply water pressure to the connection between the seepage barrier and the base.

[0022] The present invention achieves the following technical effects compared to the prior art:

[0023] This invention provides a test device and method for simulating the performance of a cutoff wall, comprising a stacked ring assembly and a shell assembly. The stacked ring assembly includes at least two stacked ring bodies, each having a first hollow cavity. Multiple stacked ring bodies are stacked sequentially, and adjacent stacked ring bodies can move relative to each other in the horizontal direction. The stacked ring assembly is mounted on a base. The shell assembly includes at least two shells, each having a second hollow cavity. Multiple shells are stacked sequentially on the stacked ring assembly. The second hollow cavities of the multiple shells and the first hollow cavities of the multiple stacked ring bodies are sequentially connected to form a molding cavity. The molding cavity is used to mold a cutoff wall, and adjacent shells can move relative to each other in the horizontal direction. This cutoff wall performance simulation test device can be used for indoor cutoff wall molding and performance testing, allowing the two processes to be performed continuously, which improves work efficiency. Because adjacent stacked ring bodies and adjacent shells can move laterally relative to each other, applying forces to the stacked ring bodies and / or shells allows for shear loading of the cutoff wall and / or the connection between the cutoff wall and the base. This enables loading at various heights of the cutoff wall, effectively replicating the shear stress conditions of the cutoff wall and improving the realism and accuracy of the test. Furthermore, by changing the number of shells, cutoff walls of different heights can be obtained, and impermeability tests can be conducted on cutoff walls of different heights. The structure is simple, applicable to tests on cutoff walls of various sizes, and easy to use. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of the anti-seepage wall performance simulation test device provided in Example 1;

[0026] Figure 2 This is a schematic diagram of the structure of the housing assembly provided in Embodiment 1;

[0027] Figure 3 A front view of the housing assembly provided in Embodiment 1;

[0028] Figure 4 A front view of the housing provided in Embodiment 1;

[0029] Figure 5 A schematic diagram of the shell structure provided in Example 1;

[0030] Figure 6This is a schematic diagram of the structure of the stacked ring body provided in Example 1;

[0031] In the diagram: 100, anti-seepage wall performance simulation test device; 1, stacked ring body; 101, first end of stacked ring; 102, second end of stacked ring; 103, first track groove; 2, base; 3, shell; 301, second hollow cavity; 302, first end of shell; 303, second end of shell; 304, second track groove; 305, transparent plate; 306, first metal plate; 307, second metal plate; 308, third metal plate; 309, angle steel; 4, ball bearing; 5, slider; 6, bearing. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The purpose of this invention is to provide a test device for simulating the performance of a cutoff wall, which solves the problems existing in the prior art and helps to improve work efficiency; it can load at various heights of the cutoff wall, can better reproduce the shear stress of the cutoff wall, and improve the authenticity and accuracy of the test; it has a simple structure, can be used for testing cutoff walls of various sizes, and is easy to apply.

[0034] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] like Figures 1-6As shown, this embodiment provides a seepage barrier performance simulation test device 100, including a stacked ring assembly and a shell assembly. The stacked ring assembly includes at least two stacked ring bodies 1, each having a first hollow cavity. Multiple stacked ring bodies 1 are stacked sequentially, and adjacent stacked ring bodies 1 can move relative to each other in the horizontal direction. The stacked ring assembly is mounted on a base 2. The shell assembly includes at least two shells 3, each having a second hollow cavity 301. Multiple shells 3 are stacked sequentially on the stacked ring assembly. The second hollow cavities 301 of the multiple shells 3 and the first hollow cavities of the multiple stacked ring bodies 1 are sequentially connected to form a molding cavity. The molding cavity is used to mold a seepage barrier, and adjacent shells 3 can move relative to each other in the horizontal direction. The above-mentioned seepage barrier performance simulation test device 100 can be used for indoor seepage barrier molding and seepage barrier performance testing, enabling the two processes to be carried out continuously, which is beneficial to improving work efficiency. Because adjacent stacked ring bodies 1 and adjacent shells 3 can move laterally relative to each other, by applying force to the stacked ring bodies 1 and / or shells 3, shear loading can be applied to the cutoff wall and / or the connection between the cutoff wall and the base 2 through the stacked ring bodies 1 and / or shells 3. Loading can be applied to various heights of the cutoff wall, thus better replicating the shear stress condition of the cutoff wall and improving the realism and accuracy of the test. Furthermore, by changing the number of shells 3, cutoff walls of different heights can be obtained, and impermeability tests can be conducted on cutoff walls of different heights. The structure is simple, applicable to tests on cutoff walls of various sizes, and easy to apply.

[0037] In this embodiment, each shell 3 is provided with an observation window, and the molding cavity can be used to mold the core wall dam. The core wall dam includes the core wall and the transition material on both sides of the core wall. The observation window can, to a certain extent, observe whether there is obvious deformation at the connection between the core wall and the transition material during the test, which facilitates the observation of the test phenomenon.

[0038] In this embodiment, two adjacent stacked ring bodies 1 are rolled together; two adjacent shells 3 are slidably connected.

[0039] In this embodiment, the end of each stacked ring body 1 closest to the base 2 is the first end 101 of the stacked ring, and the end of each stacked ring body 1 furthest from the base 2 is the second end 102 of the stacked ring. Both the first end 101 and the second end 102 of each stacked ring body 1 are provided with a first track groove group. Each first track groove group includes two opposing first track grooves 103. The two first track grooves 103 of each second end 102 are respectively opposite to the two first track grooves 103 of the adjacent first end 101. Multiple balls 4 are provided between each first track groove 103 of each second end 102 and the corresponding first track groove 103 of the adjacent first end 101. Adjacent stacked ring bodies 1 are connected by rolling balls 4. The balls 4 reduce the friction between the stacked ring bodies 1, ensuring that the shear force is evenly applied at the connection between the seepage barrier and the base 2, thus guaranteeing high accuracy of the test results.

[0040] In this embodiment, the end of each shell 3 closest to the base 2 is the first end 302 of the shell, and the end of each shell 3 furthest from the base 2 is the second end 303 of the shell. The first end 302 of each shell 3 is provided with at least two sliders 5, and the second end 303 of each shell 3 is provided with a second track groove group. Each second track groove group includes two oppositely arranged second track grooves 304. The two second track grooves 304 of the second end 303 of each shell are slidably connected to at least one slider 5 of the adjacent first end 302 of the shell. The adjacent two shells 3 are slidably connected by sliders 5, which can reduce the friction between the shells 3 and make the shear force more evenly applied inside the seepage barrier wall.

[0041] In a preferred embodiment, the slider 5 is a bearing 6, and each second track groove 304 is slidably connected to at least two sliders 5. The bearing 6 and the second track groove 304 are in point contact, which can further reduce friction.

[0042] It should be noted that each ball bearing 4 has a gap between its two ends in the length direction of the corresponding first track groove 103 to ensure that the ball bearing 4 can roll on the corresponding first track groove 103. Each slider 5 has a gap between its two ends in the length direction of the corresponding second track groove 304 to ensure that the slider 5 can slide on the corresponding second track groove 304.

[0043] In this embodiment, each housing 3 includes a transparent plate 305, a first metal plate 306, a second metal plate 307, and a third metal plate 308 that are fixedly connected in sequence. The transparent plate 305 serves as an observation window.

[0044] In a preferred embodiment, the transparent plate 305 is made of glass, and the first metal plate 306, the second metal plate 307, and the third metal plate 308 are made of steel. The stacked ring body 1 is made of metal, and preferably a hollow steel plate. The ball bearing 4 is a steel ball. The base 2 is a concrete base 2, and the core wall is an asphalt concrete core wall.

[0045] In a preferred embodiment, the transparent plate 305 is spliced ​​with the first metal plate 306, the first metal plate 306 with the second metal plate 307, the second metal plate 307 with the third metal plate 308, and the third metal plate 308 with the transparent plate 305 using angle steel 309. This design is simple in structure, easy to install and disassemble, and effectively reduces costs.

[0046] Example 2

[0047] This embodiment provides a method for simulating the performance of a cutoff wall based on the cutoff wall performance simulation test device 100 of Embodiment 1, including the following steps:

[0048] S1. Multiple stacked ring bodies 1 are stacked on the base 2 in sequence, and multiple shells 3 are stacked on the stacked ring assembly in sequence, forming a seepage barrier wall through the forming cavity;

[0049] S2. Apply a lateral loading force to at least one of the multiple stacked bodies and multiple shells 3 to obtain shear deformation data of the seepage barrier and / or the connection between the seepage barrier and the base 2.

[0050] In this embodiment, S2 includes: simultaneously applying a lateral loading force to multiple stacked bodies and multiple shells 3, and obtaining shear deformation data of the seepage barrier wall and / or the connection between the seepage barrier wall and the base 2.

[0051] In this embodiment, S1 further includes: placing the water inlet pipe in the molding cavity before completing the installation of the stacked ring assembly and the outer shell assembly; then completing the installation of the stacked ring assembly and the outer shell assembly, forming the seepage barrier wall through the molding cavity, and positioning the water outlet of the water inlet pipe between the seepage barrier wall and the base 2.

[0052] S2 also includes: while applying lateral loading to the cutoff wall, applying a vertical loading force to the upper end of the cutoff wall, and pumping water into the inlet pipe to apply water pressure at the connection between the cutoff wall and the base 2. This coupled loading of lateral loading, longitudinal loading, and water pressure loading on the cutoff wall aims to replicate its actual working state and improve the reliability of the test data.

[0053] In this embodiment, multiple displacement or stress sensors are installed at the core wall, transition material, the connection between the core wall and the transition material, and the connection between the seepage barrier wall and the base 2. While loading is being applied, the stress and strain of each part are recorded by the displacement or stress sensors, so as to better study the interaction between the core wall or transition material and other parts during the test, expand the data acquisition range of this test, and improve the accuracy and precision of the test data.

[0054] In this embodiment, S1 includes: a pre-formed base 2, which is preferably a concrete dam foundation. A layer of stacked ring body 1 is placed on the base 2, and a layer of ball bearings 4 is placed inside the stacked ring body 1, followed by the placement of a second layer of stacked ring body 1; multiple layers of stacked ring body 1 are stacked in the same manner.

[0055] Install a housing 3 on the top of the stacked ring assembly, place a bearing 6 inside the housing 3, and then place a second housing 3; stack multiple housings 3 in the same manner.

[0056] The asphalt concrete core wall and the transition material on both sides of the core wall are compacted and formed inside the molding cavity composed of the stacked ring assembly and the outer shell assembly.

[0057] After molding, the specimens should be left to stand for 3-4 days.

[0058] S2 also includes: after the asphalt concrete inside the molding cavity has completely cooled and hardened, the next shear test is carried out. This can be a uniaxial push-pull loading test or a cyclic reciprocating loading test; it can also be coupled loading of transverse loading, longitudinal loading and water pressure loading to further improve the accuracy and authenticity of the test data.

[0059] In a preferred embodiment, the anti-seepage wall performance simulation test device 100 is connected to the MTS dynamic fatigue machine fixture to conduct a shear test.

[0060] It should be noted that the MTS dynamic fatigue testing machine is existing equipment, consisting of a testing platform, a loading system, and a computer control system. The loading system applies load to the core wall and base 2 model specimens according to the set loading mode, while the computer control system collects data in real time. The computer control system can be set to use strain or stress control methods to load the specimens, simulating the actual load on the core wall and base 2 model specimens. The computer control system automatically saves the test data collected during the experiment.

[0061] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A diaphragm wall performance simulation test apparatus, characterized by: Includes stacked ring assembly and housing assembly, wherein: The stacked ring assembly includes at least two stacked ring bodies, each stacked ring body having a first hollow cavity, and multiple stacked ring bodies are stacked sequentially, with adjacent stacked ring bodies capable of relative movement in the horizontal direction; the stacked ring assembly is used to be mounted on a base; The outer shell assembly includes at least two shells, each shell having a second hollow cavity. A plurality of shells are stacked sequentially on the stacked ring assembly. The second hollow cavities of the plurality of shells and the first hollow cavities of the plurality of stacked ring bodies are sequentially connected to form a forming cavity. The forming cavity is used to form a seepage barrier wall. Two adjacent shells are capable of relative movement in the horizontal direction.

2. The anti-seepage wall performance simulation test device according to claim 1, characterized in that: Each of the aforementioned housings is provided with an observation window, and the molding cavity can be used to mold the core wall dam.

3. The anti-seepage wall performance simulation test device according to claim 1, characterized in that: The two adjacent stacked ring bodies are rolled together; the two adjacent housings are slidably connected.

4. The anti-seepage wall performance simulation test device according to claim 3, characterized in that: The end of each stacked ring body closest to the base is the first end of the stacked ring, and the end of each stacked ring body furthest from the base is the second end of the stacked ring. Both the first end and the second end of each stacked ring body are provided with a first track groove group. Each first track groove group includes two first track grooves arranged opposite each other. The two first track grooves of each second end of the stacked ring are respectively arranged opposite to the two first track grooves of the adjacent first end of the stacked ring. A plurality of balls are arranged between each first track groove of each second end of the stacked ring and the corresponding first track groove of the adjacent first end of the stacked ring.

5. The anti-seepage wall performance simulation test device according to claim 3, characterized in that: The end of each housing near the base is the first end of the housing, and the end of each housing away from the base is the second end of the housing. The first end of each housing is provided with at least two sliders, and the second end of each housing is provided with a second track groove group. Each second track groove group includes two second track grooves arranged opposite each other. The two second track grooves at the second end of each housing are slidably connected to at least one slider at the adjacent first end of the housing.

6. The anti-seepage wall performance simulation test device according to claim 5, characterized in that: Each of the sliders is a bearing, and each of the second track grooves is slidably connected to at least two of the sliders.

7. The anti-seepage wall performance simulation test device according to claim 1, characterized in that: Each of the aforementioned housings includes a transparent plate, a first metal plate, a second metal plate, and a third metal plate that are fixedly connected in sequence.

8. A method for simulating the performance of a cutoff wall based on the cutoff wall performance simulation test device according to any one of claims 1 to 7, characterized in that: Includes the following steps: S1. Multiple stacked ring bodies are sequentially stacked on the base, and multiple shells are sequentially stacked on the stacked ring assembly, forming the seepage barrier wall through the forming cavity; S2. Apply a lateral loading force to at least one of the multiple stacked bodies and multiple shells to obtain shear deformation data of the impermeable wall and / or the connection between the impermeable wall and the base.

9. The method for simulating the performance of a seepage barrier wall according to claim 1, characterized in that: S2 includes: A lateral loading force is simultaneously applied to multiple stacked bodies and multiple shells to obtain shear deformation data of the impermeable wall and / or the connection between the impermeable wall and the base.

10. The method for simulating the performance of a seepage barrier wall according to claim 1, characterized in that: S1 further includes: placing the inlet pipe in the molding cavity before completing the installation of the stacked ring assembly and the outer shell assembly; then completing the installation of the stacked ring assembly and the outer shell assembly, molding the impermeable wall through the molding cavity, and positioning the outlet of the inlet pipe between the impermeable wall and the base; S2 further includes: while applying a horizontal load to the seepage barrier, applying a vertical load force to the upper end of the seepage barrier, and pumping water into the inlet pipe to apply water pressure to the connection between the seepage barrier and the base.

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