An underwater deformation and impermeability testing device for a geomembrane anchoring structure

Abstract

The utility model relates to a kind of underwater deformation and impermeability testing device of geomembrane anchoring structure, including lifting device, sample platform, anchoring component, hydraulic chamber and underwater digital camera;Wherein, lifting device is used to adjust sample platform height adaptation different test working condition;Sample platform is integrated anchoring component, its top surface is equipped with several anchoring holes, and when assembling, it is fixed by bolt through hole and cooperate flat steel component, and geomembrane is pressed tightly, to accurately simulate the geomembrane anchoring structure in actual engineering;Hydraulic chamber is formed by cylindrical component, second flange plate, flange blind plate and geomembrane enclosure;The flange blind plate bottom surface of hydraulic chamber top is assembled underwater digital camera, for real-time acquisition geomembrane deformation image.The utility model can simulate the stress state of geomembrane anchoring structure under real water pressure, accurately obtain its deformation characteristics and impermeability under water pressure, provide real working condition test carrier for geomembrane anchoring performance test, structure optimization.

Description

Technical Field

[0001] This utility model relates to an underwater deformation and impermeability testing device for geomembrane anchoring structures, belonging to the technical field of geomembrane anchoring structure performance testing. Background Technology

[0002] In hydropower projects using geomembranes as seepage barriers, the integrity of the geomembrane is crucial for ensuring the reliability of seepage prevention. For the geomembrane to achieve a seal, it must be anchored to the surrounding dam body and foundation. Anchoring is essential to guarantee its integrity, and for hydropower projects with high water heads, mechanical anchoring is generally used. Because flexible geomembrane materials are highly susceptible to deformation under water pressure, even a small displacement at the anchorage can cause significant deformation and damage within a small area, leading to the failure of the geomembrane seepage prevention system. Current research on the stress-deformation characteristics of geomembrane anchoring structures is mostly based on simulating water pressure using mechanical pressure, without conducting corresponding experimental studies simulating real water pressure. Therefore, further verification is needed to apply these research findings to engineering projects.

[0003] A search revealed that the invention patent application No. 201711232651.3 and publication number CN108007762A discloses a test instrument for simulating the entire process of failure of the geomembrane at the anchorage of the rockfill dam using mechanical force; the invention patent application No. 201410687174.X and authorization announcement number CN104374645B discloses a mechanical dynamic test instrument and test method for simulating the deformation and failure of flexible seepage-proof joint structures under different contact material conditions; and the invention patent application No. 201810347552.8 and authorization announcement number CN108956310B discloses a geomembrane hydroswell deformation test device and test method based on three-dimensional DIC, used to record and quantitatively describe the hydroswell deformation process and final failure state of the geomembrane. However, most of the above-mentioned patented technical solutions simulate the failure of the geomembrane at the geomembrane anchorage through mechanical force, but no corresponding research has been carried out on how to measure and calculate the deformation and seepage prevention performance of the geomembrane anchorage structure under water pressure.

[0004] Therefore, there is an urgent need to develop a method for measuring and calculating the deformation and seepage prevention performance of geomembrane anchored structures under water pressure, in order to fill the gaps in the existing technology and meet the needs of engineering fields for performance testing and analysis of such structures. Utility Model Content

[0005] The main objective of this invention is to overcome the problems existing in the prior art and provide an underwater deformation and seepage resistance testing device for geomembrane anchoring structures. This device can simulate the underwater measurement of geomembrane anchoring structures in real dams, and obtain the deformation state and seepage law of the geomembrane anchoring structure under water pressure. It is suitable for evaluating the deformation safety and seepage resistance of seepage-proof geomembrane anchoring structures in water conservancy and hydropower projects, and provides a scientific basis for engineering design and construction.

[0006] The technical solution of this utility model to solve its technical problem is as follows:

[0007] An underwater deformation and impermeability testing device for geomembrane anchoring structures includes a lifting device, on which a sample loading platform is fixedly supported; a first flange is circumferentially and coaxially sealed to the sample loading platform, and a second flange is coaxially positioned above the first flange, the first flange and the second flange being fastened together; the internal space of the sample loading platform consists of a component area and a filling area, the component area of ​​the sample loading platform is provided with anchoring components, the filling area of ​​the sample loading platform is provided with a compression layer and a cushion layer, the compression layer is in contact with the bottom of the filling area, and the cushion layer is laid on the compression layer; a drainage hole is provided at the bottom of the sample loading platform, located in the filling area of ​​the sample loading platform.

[0008] Anchored geomembrane is sandwiched between the first and second flanges; the portion of the geomembrane above the sample loading platform component area is anchored to the anchoring component; strain gauges are attached to the portion of the geomembrane above the sample loading platform filling area, with the strain gauges located on the side of the geomembrane facing the sample loading platform and between the geomembrane and the cushion layer, and in close contact with the cushion layer; the strain gauges have cables, and the microcomputer control system includes a strain gauge data collection module (used to receive measurement data transmitted from the strain gauges) connected to the data output terminal of the strain gauges via cables.

[0009] A coaxial cylindrical component is supported on the second flange, and a flange blind plate is coaxially provided on the top of the cylindrical component; the bottom end of the cylindrical component is sealed and fixedly connected to the second flange, and the top end of the cylindrical component is sealed and fixedly connected to the flange blind plate; the inner diameter of the cylindrical component is larger than the inner diameter of the second flange; the cylindrical component, the second flange, the flange blind plate, and the geomembrane together form a hydraulic chamber; the geomembrane, the cylindrical component, and the sample loading platform are projected in the same horizontal plane, the sample loading platform is located within the coverage area of ​​the cylindrical component or the two overlap, and the cylindrical component is located within the coverage area of ​​the geomembrane.

[0010] The bottom surface of the flange blind plate faces the hydraulic chamber; an underwater digital camera is installed on the bottom surface of the flange blind plate, and the underwater digital camera is located on the top of the hydraulic chamber, with the underwater digital camera sealed and fixedly connected to the flange blind plate; the flange blind plate has a water inlet and an air vent; the water inlet is connected to a water pump; the microcomputer control system also includes a water pressure control module connected to the controlled end of the water pump (used to drive the water pump to run, so that the water pump injects water into the hydraulic chamber through the water inlet and performs hydraulic control); the underwater digital camera has a camera cable connected to a computer, and the computer is connected to the controlled end and data output end of the underwater digital camera through the camera cable (used to control the underwater digital camera and receive the shooting data of the underwater digital camera for analysis and processing); a drain pipe connected to the hydraulic chamber is opened on the side of the second flange.

[0011] This device can simulate the geomembrane anchoring structure of a dam. During testing, the descent rate of the cushion layer is adjusted by controlling the water pressure, thereby obtaining data on the deformation of the geomembrane under different water pressures. At the same time, seepage water is collected and the collection time is recorded under different water pressure conditions. Based on the collected water volume and the pressure control time, the permeability coefficient of the anchoring structure is calculated, and its seepage prevention performance is evaluated.

[0012] The further improved technical solution of this utility model is as follows:

[0013] Preferably, the sample loading platform is an open, hollow cylinder without a top surface; the component area and the filling area of ​​the sample loading platform equally divide the internal space of the sample loading platform and are symmetrically distributed on both sides of the central axis of the sample loading platform; the anchoring component fills the component area, and the compression layer and the cushion layer together fill the filling area; the geomembrane is divided into a first area and a second area; the first area of ​​the geomembrane is clamped and anchored between the first flange and the second flange; the second area of ​​the geomembrane is anchored to the anchoring component.

[0014] By adopting this preferred scheme, the specific technical details of the sample loading platform and the geomembrane can be further optimized.

[0015] Preferably, the anchoring member is a hollow semi-cylinder with an inverted opening and no bottom surface. The center of the semi-circle on the top surface of the anchoring member coincides with the central axis of the sample loading platform. The arc-shaped side of the anchoring member matches the inner wall of the sample loading platform. The rectangular side of the anchoring member faces the filling area and contacts the compression layer and the cushion layer respectively. A set of anchoring holes is provided on the top surface of the anchoring member near the rectangular side. The anchoring holes are arranged in a row and parallel to the diameter of the semi-circle on the top surface. Above the anchoring holes, a long strip-shaped flat steel member is provided on the top surface of the anchoring member. The flat steel member has through holes corresponding to each anchoring hole. The geomembrane is located between the flat steel member and the top surface of the anchoring member. The anchoring connection structure between the geomembrane and the anchoring member is formed by fasteners passing through the flat steel member, the geomembrane, and the anchoring holes in sequence and being fastened.

[0016] By adopting this preferred scheme, the specific structure of the anchoring components and the geomembrane anchoring connection structure can be further optimized.

[0017] Preferably, one end of the strain gauge cable is electrically connected to the strain gauge, and the other end of the cable extends downward along the outer side of the rectangular side of the anchoring member, enters the interior of the anchoring member and extends downward along the inner side of the rectangular side to the bottom of the sample loading platform, extends laterally along the bottom of the sample loading platform, and finally exits the sample loading platform and connects to the microcomputer control system.

[0018] More preferably, the rectangular side of the anchoring member is provided with strain gauge cable through holes for the cables supplying the strain gauges to pass through, and the bottom of the sample loading platform is provided with strain gauge cable mounting holes for the cables to pass through, the strain gauge cable mounting holes being located within the component area of ​​the sample loading platform.

[0019] By adopting the above preferred scheme, the wiring layout of the strain gauge cable can be further optimized.

[0020] Preferably, the bottom surface of the flange blind plate is provided with a first annular slot that is sealed and fixed to the top end of the cylindrical member; the plate surface of the second flange that contacts the cylindrical member is provided with a second annular slot, and the second annular slot is sealed and fixed to the bottom end of the cylindrical member.

[0021] By adopting this preferred solution, the sealing structure at the top and bottom of the cylindrical component can be further optimized.

[0022] Preferably, the surface of the first flange that contacts the geomembrane is provided with a first sealing groove, the first sealing groove is annular, and a sealing ring (such as an O-ring) is provided inside the first sealing groove; the surface of the first flange that contacts the geomembrane is provided with a chamfer at the inner edge of the first flange, the chamfer is arc-shaped; the surface of the second flange that contacts the geomembrane is provided with a second sealing groove, the second sealing groove is annular, and a sealing ring (such as an O-ring) is provided inside the second sealing groove.

[0023] By adopting this preferred scheme, the sealing structure of the first flange and the second flange on the geomembrane can be further optimized, that is, the sealing ring in the first sealing groove and the sealing ring in the second sealing groove form a synergistic sealing effect on the geomembrane.

[0024] Preferably, the flange blind plate is also provided with a camera mounting hole; the camera mounting hole is located in the middle of the flange blind plate, and the water inlet and vent are located on both sides of the camera mounting hole; the water inlet is connected to the water pump via a pressurized water pipe; the vent is provided with an vent valve; the back of the underwater digital camera is sealed and installed on the camera mounting hole, one end of the camera cable is electrically connected to the underwater digital camera, and the other end of the camera cable passes through the camera mounting hole and is connected to the computer; the drain pipe of the second flange is provided with a drain valve.

[0025] By adopting this preferred solution, the camera mounting structure, as well as the specific technical details of the water inlet, vent, and drain pipe, can be further optimized.

[0026] Preferably, the lifting device has a vertically arranged screw and a screw power drive device threadedly connected to the screw, with the top end of the screw coinciding with the lifting end of the lifting device; the microcomputer control system also includes a platform displacement control module (used to drive the screw power drive device) connected to the controlled end of the screw power drive device.

[0027] By adopting this preferred solution, the specific technical details of the lifting device can be further optimized.

[0028] Preferably, the cylindrical component is made of transparent plexiglass; the contact area between the sample loading platform and the first flange is sealed with an oil-based seal.

[0029] By adopting this preferred solution, the remaining technical details of the testing device can be further optimized.

[0030] This invention is used for underwater deformation and seepage resistance testing of geomembrane anchoring structures. It can obtain the deformation and seepage resistance characteristics of geomembrane anchoring structures under water pressure. By simulating the stress state of the structure in the actual dam environment, it reveals the deformation law and seepage resistance performance of the structure, thus providing a scientific basis for the optimized design of geomembrane anchoring structures in engineering practice. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings.

[0032] Figure 1 This is a schematic diagram illustrating the specific implementation of the testing device in Embodiment 1 of this utility model.

[0033] Figure 2 This is a schematic diagram of the overall structure of the testing device in Embodiment 1 of this utility model.

[0034] Figure 3 This is a schematic diagram of the anchoring component in Embodiment 1 of this utility model.

[0035] Figure 4 This is a top view schematic diagram of the geomembrane anchoring method in Embodiment 1 of this utility model.

[0036] Figure 5 This is a partial structural diagram of the edge of the geomembrane in Embodiment 1 of this utility model.

[0037] Figure 6 This is a top view of the first flange in Embodiment 1 of this utility model.

[0038] Figure 7 This is a bottom view of the second flange in Embodiment 1 of this utility model.

[0039] Figure 8This is a top view of the second flange in Embodiment 1 of this utility model.

[0040] Figure 9 This is a bottom view of the flange blind plate in Embodiment 1 of this utility model. Detailed Implementation

[0041] Example 1

[0042] like Figures 1 to 9 As shown, the underwater deformation and impermeability testing device for the geomembrane anchoring structure in this embodiment includes a lifting device. A sample loading platform 2 is fixedly supported on the lifting end of the lifting device. A first flange 3 is circumferentially and coaxially sealed and fixed to the sample loading platform 2. A second flange 4A is coaxially provided above the first flange 3. The first flange 3 and the second flange 4A are fixedly connected by fasteners. The internal space of the sample loading platform 2 consists of a component area and a filling area. An anchoring component 1 is provided in the component area of ​​the sample loading platform 2. A compression layer 7 and a cushion layer 8 are provided in the filling area of ​​the sample loading platform 2. The compression layer 7 is in contact with the bottom of the filling area, and the cushion layer 8 is laid on the compression layer 7.

[0043] The geomembrane 5 is clamped and anchored between the first flange 3 and the second flange 4A; the part of the geomembrane 5 above the sample loading platform 2 component area is anchored to the anchoring component 1; a strain gauge 20 is attached to the part of the geomembrane 5 above the filling area of ​​the sample loading platform 2; the strain gauge 20 is located on the side of the geomembrane 5 facing the sample loading platform 2 and between the geomembrane 5 and the cushion layer 8; the strain gauge 20 is in close contact with the cushion layer 8.

[0044] A coaxial cylindrical component 4C is supported on the second flange 4A. A flange blind plate 4D is coaxially mounted on the top of the cylindrical component 4C. The bottom end of the cylindrical component 4C is sealed and fixedly connected to the second flange 4A, and the top end of the cylindrical component 4C is sealed and fixedly connected to the flange blind plate 4D. The inner diameter of the cylindrical component 4C is larger than the inner diameter of the second flange 4A. The cylindrical component 4C, the second flange 4A, the flange blind plate 4D, and the geomembrane 5 together form the hydraulic chamber 4. In this embodiment, the height of the first flange 3 is 220mm; the maximum water pressure that the hydraulic chamber 4 can withstand is not less than 1.5 times the test requirement (2.2MPa in this embodiment); the inner diameter of the cylindrical component 4C is 400mm, and the cylinder thickness is 20mm; the outer diameter of the second flange 4A and the diameter of the flange blind plate 4D are both 556mm.

[0045] In the projection of the geomembrane 5, the cylindrical component 4C, and the sampling platform 2 on the same horizontal plane, the sampling platform 2 is located within the coverage area of ​​the cylindrical component 4C or the two overlap, and the cylindrical component 4C is located within the coverage area of ​​the geomembrane 5. In addition, to facilitate observation of the internal liquid state, the cylindrical component 4C is made of transparent plexiglass.

[0046] Specifically, such as Figure 1 , Figure 2 As shown, the sample loading platform 2 is an open, hollow cylinder without a top surface. The component area and the filling area of ​​the sample loading platform 2 equally divide the internal space of the sample loading platform 2 and are symmetrically distributed on both sides of the central axis of the sample loading platform 2. The anchoring component 1 fills the component area, and the compression layer 7 and the padding layer 8 together fill the filling area. A drainage hole 2B is provided at the bottom of the sample loading platform 2, and the drainage hole 2B is located in the filling area of ​​the sample loading platform 2. In this embodiment, the inner diameter of the sample loading platform 2 is 379mm; the radius of the drainage hole 2B is 5mm. The function of the drainage hole 2B is to receive seepage water during the seepage prevention performance test of the geomembrane anchoring structure for calculating the permeability coefficient of the structure; and to drain the residual water in the sample loading platform after use.

[0047] The contact area between the sample loading platform 2 and the first flange 3 is treated with an oil-based sealant.

[0048] Anchor component 1 is a hollow semi-cylinder with an inverted opening and no bottom surface. The center of the semi-circle on the top surface of anchor component 1 coincides with the central axis of the sample loading platform 2. The arc-shaped side of anchor component 1 matches the inner wall of the sample loading platform 2. The rectangular side of anchor component 1 faces the filling area and contacts the compression layer 7 and the padding layer 8 respectively. Figure 3 As shown, the top surface of the anchoring member 1 has a set of anchoring holes 1B near the rectangular side. The anchoring holes 1B are arranged in a row and are parallel to the diameter of the semicircle of the top surface. Above the anchoring holes 1B, the top surface of the anchoring member 1 has a long strip-shaped flat steel member 1A. The flat steel member 1A has through holes that correspond one-to-one with each anchoring hole 1B. The geomembrane 5 is located between the flat steel member 1A and the top surface of the anchoring member 1. Bolts are passed through the flat steel member 1A, the geomembrane 5, and the anchoring holes 1B in sequence and tightened to anchor the geomembrane 5 to the anchoring member 1. In this embodiment, the radius of the top surface of the anchoring member 1 is 189mm, the height of the anchoring member 1 is 155mm, the radius of the anchoring holes 1B is 5mm, the center distance between adjacent anchoring holes is 70mm, and the thickness of the flat steel member 1A is 2-3mm. The appropriate thickness of the flat steel member 1A is selected according to the test requirements to avoid the flat steel member 1A bending and deforming upward due to excessive water pressure, which would cause the sealing structure to fail.

[0049] like Figure 4 As shown, the geomembrane 5 is divided into a first region 5A and a second region 5B; the first region 5A of the geomembrane 5 is clamped and anchored between the first flange 3 and the second flange 4A; the second region 5B of the geomembrane 5 is anchored to the anchoring member 1.

[0050] The strain gauge 20 has a cable 15. One end of the cable 15 is electrically connected to the strain gauge 20. The other end of the cable 15 extends downward along the outer side of the rectangular side of the anchoring member 1, enters the interior of the anchoring member 1, extends downward along the inner side of the rectangular side to the bottom of the sample loading platform 2, extends laterally along the bottom of the sample loading platform 2, and finally exits the sample loading platform 2 and connects to the microcomputer control system 16. The microcomputer control system 16 receives the measurement data transmitted from the strain gauge 20 through the cable 15 using its strain gauge data collection module.

[0051] The rectangular side of the anchoring component 1 has a strain gauge cable through-hole 1C for the cable 15 to pass through, and the bottom of the sample loading platform 2 has a strain gauge cable mounting hole 2A for the cable 15 to pass through. The strain gauge cable mounting hole 2A is located within the component area of ​​the sample loading platform 2. In this embodiment, the radii of both the strain gauge cable through-hole 1C and the strain gauge cable mounting hole 2A are 5mm. It should be noted that, to ensure accurate calculation of the permeability coefficient, the cable 15 is sealed after passing through the strain gauge cable mounting hole 2A, so that seepage water can only be discharged from the sample loading platform 2 through the drainage hole 2B.

[0052] The bottom surface of flange blind flange 4D faces hydraulic chamber 4. For example... Figure 9 As shown, the bottom surface of the flange blind plate 4D is provided with a first annular slot 4J that is sealed and fixed to the top end of the cylindrical member 4C. As... Figure 8 As shown, the second flange 4A has a second annular slot 4I on its surface that contacts the cylindrical member 4C. The second annular slot 4I is sealed and fixed to the bottom end of the cylindrical member 4C. In this embodiment, the groove width of the first annular slot 4J is 20mm, and its inner radius is 200mm; the groove width of the second annular slot 4I is 20mm, and its inner radius is 200mm.

[0053] An underwater digital camera 10 is installed on the bottom surface of the flange blind plate 4D. The underwater digital camera 10 is located on the top of the hydraulic chamber 4 and is sealed and fixedly connected to the flange blind plate 4D.

[0054] The flange blind plate 4D is provided with a water inlet 4G, a vent 4E, and a camera mounting hole 4F. The camera mounting hole 4F is located in the middle of the flange blind plate 4D, while the water inlet 4G and vent 4E are located on either side of the camera mounting hole 4F. In this embodiment, the radii of the water inlet 4G and vent 4E are both 5mm, and the radius of the camera mounting hole 4F is 20mm, with pipe threads machined inside the hole.

[0055] The water inlet 4G is used for both water intake and pressurization. The water inlet 4G is connected to the water pump via the pressurization water pipe 12, and the controlled end of the water pump is connected to the microcomputer control system 16. The microcomputer control system 16 drives the water pump to operate with its water pressure control module, so that the water pump sequentially injects water into the hydraulic chamber 4 and performs hydraulic control through the pressurization water pipe 12 and the water inlet 4G.

[0056] An exhaust valve 13 is provided on the exhaust port 4E.

[0057] The underwater digital camera 10 has a camera cable 10A. The back of the underwater digital camera 10 is sealed and mounted on the camera mounting hole 4F. One end of the camera cable 10A is electrically connected to the underwater digital camera 10, and the other end of the camera cable 10A passes through the camera mounting hole 4F and is connected to the computer 17. The computer 17 controls the underwater digital camera 10 through the camera cable 10A, and the shooting data of the underwater digital camera 10 is transmitted to the computer 17 through the camera cable 10A for analysis and processing.

[0058] A drain pipe 4B communicating with the hydraulic chamber 4 is provided on the side of the second flange 4A, and a drain valve 14 is provided on the drain pipe 4B. In this embodiment, the radius of the drain pipe 4B is 8mm.

[0059] like Figures 5 to 7 As shown, the surface of the first flange 3 that contacts the geomembrane 5 is provided with a first sealing groove 3B. The first sealing groove 3B is annular, and a sealing ring, which is an O-ring, is provided inside the first sealing groove 3B. The surface of the first flange 3 that contacts the geomembrane 5 is provided with a chamfer 3A at the inner edge of the first flange 3. The chamfer 3A is arc-shaped, and its function is to reduce water pressure damage to the geomembrane 5 in this area. In this embodiment, the groove width of the first sealing groove 3B is 5mm, and its inner radius is 230mm; the radius of the chamfer 3A is 5mm.

[0060] The second flange 4A, which contacts the geomembrane 5, has a second sealing groove 4H. The second sealing groove 4H is annular, and a sealing ring, which is an O-ring, is provided inside the second sealing groove 4H. In this embodiment, the groove width of the second sealing groove 4H is 5mm, and its inner radius is 215mm.

[0061] The sealing ring in the first sealing groove 3B and the sealing ring in the second sealing groove 4H work together to enhance the sealing performance of the geomembrane 5.

[0062] The lifting device has a vertically arranged screw 6 and a screw power drive device 11 threadedly connected to the screw 6. The top end of the screw 6 coincides with the lifting end of the lifting device. The controlled end of the screw power drive device 11 is connected to the microcomputer control system 16. The microcomputer control system 16 drives the screw power drive device 11 with its platform displacement control module.

[0063] The specific usage process of this embodiment is as follows:

[0064] (1) Place the anchoring component 1 into the component area of ​​the sample loading platform 2; anchor the pre-cut geomembrane 5 to the anchoring component 1; attach the strain gauge 20 to the part of the geomembrane 5 above the filling area of ​​the sample loading platform 2, with the strain gauge 20 located on the side of the geomembrane 5 facing the sample loading platform 2; arrange the cable 15 of the strain gauge 20 along the preset line; lay the compression layer 7 and the cushion layer 8 into the filling area of ​​the sample loading platform 2 in sequence; fill the gap between the chamfer 3A of the first flange 3 and the anchoring component 1 or the cushion layer 8 with the preset material sand; control the screw power drive device 11 to raise and lower the screw 6 through the microcomputer control system 16 to adjust the sample loading platform 2 to the preset height; install the pre-sealed and fixed flange blind plate 4D, cylindrical component 4C and second flange 4A, clamp the geomembrane 5 between the first flange 3 and the second flange 4A, and make the geomembrane 5 adhere to the cushion layer 8; fix the first flange 3 and the second flange 4A with fasteners; complete the assembly.

[0065] (2) Close the drain pipe 4B and open the vent 4E; control the water pump through the inlet 4G to inject water into the hydraulic chamber 4 through the microcomputer control system 16. After the hydraulic chamber 4 is filled with water, close the vent 4E and adjust the initial water pressure of the hydraulic chamber 4. Control the underwater digital camera 10 through the computer 17 to take the initial picture of the geomembrane 5; control the water pressure loading rate of the hydraulic chamber 4 to compress the compression layer 7 according to the preset compression rate, so that the geomembrane will produce a predetermined deformation in this area. At the same time, take pictures of the process of the geomembrane 5 descending with the cushion layer 8; during this process, collect seepage water through the drain hole 2B of the sample loading platform 2, record the seepage water volume and collection time, calculate the permeability coefficient and impermeability strength of the geomembrane anchoring structure, and collect the measurement data of the strain gauge 20 in real time through the microcomputer control system 16, and record the maximum water pressure that the geomembrane 5 can withstand, and obtain the water pressure resistance performance data of the geomembrane 5 (i.e., the maximum water pressure resistance).

[0066] (3) The initial image of the geomembrane 5 taken by the underwater digital camera 10 and the various images of the geomembrane 5 as it descends with the cushion layer 8 are analyzed by image processing technology to obtain the deformation information of the geomembrane 5, such as area strain, and are corroborated with the measurement data of the strain gauge 20 in (2).

[0067] (4) After the test is completed, the water pump is turned off through the microcomputer control system 16; the vent 4E is opened and the drain pipe 4B is opened to drain the water in the hydraulic chamber 4; then the geomembrane 5, anchoring component 1, cushion layer 8, compression layer 7, strain gauge 20 and its cable 15 are taken out.

[0068] The above process can be used to obtain test results on the underwater deformation and impermeability of geomembrane anchoring structures.

[0069] It should be noted that this embodiment only involves the use of the software program and does not involve any improvement to the software program itself; in addition, the electrical components in this embodiment are all made of existing electronic components, and those skilled in the art can easily purchase the corresponding commercially available products based on the functions of each electrical component described in this embodiment, without the need for detailed description and guidance in this embodiment.

[0070] Furthermore, it should be noted that if this utility model mentions "fixed connection" or "fixed connection," unless otherwise specified, a suitable method can be selected from existing fixed connection methods such as fastener connection, welding connection, and integral molding connection. If this utility model mentions "rotational connection," unless otherwise specified, a suitable method can be selected from existing rotational connection methods such as bearing rotational connection, shaft rotational connection, and ball joint and ball seat rotational connection. These are all technical means that can be easily understood and implemented by those skilled in the art, and it is not necessary for this utility model to specifically list and draw drawings to explain their specific structures. There is no possibility that the content described in this utility model cannot constitute a clear and complete technical solution.

[0071] The above are merely specific embodiments of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model. Therefore, this utility model is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein. In addition to the embodiments described above, this utility model may have other embodiments. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the protection scope claimed by this utility model.

Claims

1. A testing device for underwater deformation and impermeability of a geomembrane anchoring structure, comprising a lifting device, wherein a sample loading platform is fixedly supported on the lifting end of the lifting device; a first flange is circumferentially and coaxially sealed and fixedly connected to the sample loading platform, and a second flange is provided on the upper part of the first flange, the first flange and the second flange being fixedly connected by fasteners; the internal space of the sample loading platform is composed of a component area and a filling area, an anchoring component is provided in the component area of ​​the sample loading platform, and a compression layer and a cushion layer are provided in the filling area of ​​the sample loading platform, the compression layer being in contact with the bottom of the filling area, and the cushion layer being laid on the compression layer; a drainage hole is provided at the bottom of the sample loading platform, the drainage hole being located in the filling area of ​​the sample loading platform; An anchor geomembrane is sandwiched between the first flange and the second flange; the portion of the geomembrane above the sample loading platform component area is anchored to the anchoring component; a strain gauge is attached to the portion of the geomembrane above the sample loading platform filling area, the strain gauge is located on the side of the geomembrane facing the sample loading platform and between the geomembrane and the cushion layer, and the strain gauge is in close contact with the cushion layer; the strain gauge has a cable, and the data output end of the strain gauge is connected to the microcomputer control system via the cable; A coaxial cylindrical component is supported on the second flange, and a flange blind plate is coaxially provided on the top of the cylindrical component; the bottom end of the cylindrical component is sealed and fixedly connected to the second flange, and the top end of the cylindrical component is sealed and fixedly connected to the flange blind plate; the inner diameter of the cylindrical component is larger than the inner diameter of the second flange; the cylindrical component, the second flange, the flange blind plate, and the geomembrane together form a hydraulic chamber; the geomembrane, the cylindrical component, and the sampling platform are projected in the same horizontal plane, and the sampling platform is located within the coverage area of ​​the cylindrical component or the two overlap, and the cylindrical component is located within the coverage area of ​​the geomembrane; The bottom surface of the flange blind plate faces the hydraulic chamber; an underwater digital camera is installed on the bottom surface of the flange blind plate, and the underwater digital camera is located on the top of the hydraulic chamber and is sealed and fixedly connected to the flange blind plate; the flange blind plate is provided with a water inlet and a vent; the water inlet is connected to a water pump; the controlled end of the water pump is connected to a microcomputer control system; the underwater digital camera has a camera cable, and the controlled end and data output end of the underwater digital camera are connected to a computer via the camera cable; a drain pipe communicating with the hydraulic chamber is opened on the side of the second flange.

2. The underwater deformation and impermeability testing device for a geomembrane anchoring structure according to claim 1, characterized in that, The sample loading platform is an open, hollow cylinder without a top surface; the component area and the filling area of ​​the sample loading platform equally divide the internal space of the sample loading platform and are symmetrically distributed on both sides of the central axis of the sample loading platform; the anchoring component fills the component area, and the compression layer and the cushion layer together fill the filling area; the geomembrane is divided into a first area and a second area; the first area of ​​the geomembrane is clamped and anchored between the first flange and the second flange; the second area of ​​the geomembrane is anchored to the anchoring component.

3. The underwater deformation and impermeability testing device for a geomembrane anchoring structure according to claim 2, characterized in that, The anchoring member is a bottomless, inverted, open, hollow semi-cylinder. The center of the semi-circle on the top surface of the anchoring member coincides with the central axis of the sample loading platform. The arc-shaped side of the anchoring member matches the inner wall of the sample loading platform. The rectangular side of the anchoring member faces the filling area and contacts the compression layer and the cushion layer respectively. A set of anchoring holes is provided on the top surface of the anchoring member near the rectangular side. The anchoring holes are arranged in a row and parallel to the diameter of the semi-circle on the top surface. Above the anchoring holes, a long strip-shaped flat steel member is provided on the top surface of the anchoring member. The flat steel member has through holes corresponding to each anchoring hole. The geomembrane is located between the flat steel member and the top surface of the anchoring member. The anchoring connection structure between the geomembrane and the anchoring member is formed by fasteners passing through the flat steel member, the geomembrane, and the anchoring holes in sequence and being fastened.

4. The underwater deformation and impermeability testing device for a geomembrane anchoring structure according to claim 3, characterized in that, One end of the strain gauge cable is electrically connected to the strain gauge, and the other end of the cable extends downward along the outer side of the rectangular side of the anchoring member, enters the interior of the anchoring member and extends downward along the inner side of the rectangular side to the bottom of the sample loading platform, extends laterally along the bottom of the sample loading platform, and finally exits the sample loading platform and connects to the microcomputer control system.

5. The underwater deformation and impermeability testing device for a geomembrane anchoring structure according to claim 4, characterized in that, The rectangular side of the anchoring component is provided with strain gauge cable through holes for the cables supplying the strain gauges to pass through, and the bottom of the sample loading platform is provided with strain gauge cable mounting holes for the cables to pass through, and the strain gauge cable mounting holes are located within the component area of ​​the sample loading platform.

6. A testing device for underwater deformation and impermeability of geomembrane anchoring structures according to any one of claims 1 to 5, characterized in that, The bottom surface of the flange blind plate is provided with a first annular slot that is sealed and fixed to the top end of the cylindrical member; the plate surface of the second flange that contacts the cylindrical member is provided with a second annular slot, and the second annular slot is sealed and fixed to the bottom end of the cylindrical member.

7. A testing device for underwater deformation and impermeability of geomembrane anchoring structures according to any one of claims 1 to 5, characterized in that, The first flange has a first sealing groove on the surface that contacts the geomembrane. The first sealing groove is annular and contains a sealing ring. The first flange has a chamfer at the inner edge of the surface that contacts the geomembrane. The chamfer is arc-shaped. The second flange has a second sealing groove on the surface that contacts the geomembrane. The second sealing groove is annular and contains a sealing ring.

8. A testing device for underwater deformation and impermeability of geomembrane anchoring structures according to any one of claims 1 to 5, characterized in that, The flange blind plate is also provided with a camera mounting hole; the camera mounting hole is located in the middle of the flange blind plate, and the water inlet and vent are located on both sides of the camera mounting hole; the water inlet is connected to a water pump via a pressurized water pipe; the vent is provided with an vent valve; the back of the underwater digital camera is sealed and mounted on the camera mounting hole, one end of the camera cable is electrically connected to the underwater digital camera, and the other end of the camera cable passes through the camera mounting hole and is connected to a computer; the drain pipe of the second flange is provided with a drain valve.

9. A testing device for underwater deformation and impermeability of geomembrane anchoring structures according to any one of claims 1 to 5, characterized in that, The lifting device has a vertically arranged screw and a screw power drive device threadedly connected to the screw. The top end of the screw coincides with the lifting end of the lifting device. The controlled end of the screw power drive device is connected to a microcomputer control system.

10. A testing device for underwater deformation and impermeability of a geomembrane anchoring structure according to any one of claims 1 to 5, characterized in that, The cylindrical component is made of transparent plexiglass; the contact area between the sample loading platform and the first flange is sealed with an oil-based seal.

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