Equipment and method for detecting impermeability of full-size composite lining structure

Abstract

The invention relates to equipment and a method for detecting the impermeability of a full-size composite lining structure. The detection equipment comprises an impermeability detection device, a seepage loading device, a seepage monitoring device and a numerical control platform, the anti-permeability performance detection device comprises a sleeve assembly and a lower cover. A seepage interface is arranged in the middle area of the lower cover; the sleeve assembly is used for loading a full-size composite lining; the periphery of the full-size composite lining is in sealing fit with the inner wall of the sleeve assembly; the seepage loading device is connected with the seepage connector through a pipeline and used for providing seepage water pressure for the outer surface of the full-size composite lining. The seepage monitoring device comprises a fiber bragg grating seepage pressure sensor which is pre-embedded in the full-size composite lining and is used for acquiring pore water pressure data of different depths in the full-size composite lining; and the numerical control platform is in line connection with the seepage loading device and the seepage monitoring device. The impervious performance detection equipment and the impervious performance detection method provide a basis for durability and safety evaluation of a lining structure and provide technical support for subsea tunnel construction.

Description

Technical Field

[0001] The invention relates to the technical field of lining anti-seepage performance testing equipment, and in particular to an anti-seepage performance testing equipment and method for a full-size composite lining structure. Background Art

[0002] Subsea tunnels are transportation pipeline technology projects built under the seabed in straits, bays and estuaries to connect land transportation. In the construction of marine island and reef projects, it is necessary to consider the anti-seepage performance of the lining structure itself under the high osmotic pressure environment of the seabed. Subsea tunnels are different from mountain tunnels. Underwater tunnels are mostly based on the principle of drainage and drainage with limited discharge. The drainage conditions of subsea tunnels are poor and the maintenance cost of leakage water is high. The water pressure on the structure is large. The harsh service environment and the unlimited coverage of seawater effect are the main causes of the functional attenuation of the lining structure. The leakage problem and tunnel flooding of subsea tunnels are more serious than those of mountain tunnels. Therefore, the anti-seepage performance of the lining structure under high osmotic pressure conditions for a long time is an important indicator for durability evaluation.

[0003] The HS-4B concrete permeameter in the Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete (GB / T50082-2009) is widely used to determine the impermeability grade of ordinary concrete test blocks. However, this method cannot be used to test the pore water pressure inside the full-size composite lining structure and the impermeability of the lining structure.

[0004] Therefore, how to measure the internal pore water pressure of a sufficient-sized composite lining structure and the anti-seepage performance of the lining structure under high osmotic pressure conditions is a technical problem that urgently needs to be solved in this field. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a device and method for detecting the anti-seepage performance of a full-size composite lining structure, which provides a reliable device for detecting the pore water pressure inside the full-size lining structure under high osmotic pressure and the anti-seepage performance of the structure, provides a basis for the durability and safety evaluation of the lining structure, and provides technical support for the construction of submarine tunnels.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a full-size composite lining structure anti-seepage performance testing device, including an anti-seepage performance testing device, a seepage loading device, a seepage monitoring device and a numerical control platform; the anti-seepage performance testing device includes a sleeve assembly and a lower cover; the sleeve assembly includes a conical sleeve portion with a small upper diameter and a large lower diameter and a flange portion located at the bottom side of the sleeve portion; the lower cover is a blind flange; a seepage interface is provided in the middle area of ​​the lower cover; the sleeve assembly is fixedly connected to the lower cover by means of a flange portion through bolt fasteners; the sleeve assembly is used to load the ... monitoring device and a numerical control platform; the anti-seepage performance testing device includes a sleeve assembly and a lower cover; the sleeve assembly includes a conical sleeve portion with a small upper diameter and a large lower diameter and a flange portion located at the bottom side of the sleeve portion; the lower cover is a blind flange; a seepage interface is provided in the middle area of ​​the lower cover; the sleeve assembly is fixedly connected to the lower cover by means of a flange portion through bolt fasteners; the sleeve assembly is used to load the full-size composite lining structure anti-seepage performance testing device, including an anti-seepage performance testing device, a seepage monitoring device and a numerical control platform; the anti-seepage performance testing device includes a sleeve assembly and a lower cover; the sleeve assembly includes a conical sleeve portion and full-size composite lining; the bottom side of the full-size composite lining is the outer surface and the top side is the inner surface; the outer periphery of the full-size composite lining is sealed with the inner wall of the sleeve assembly; the seepage loading device is connected to the seepage interface through a pipeline, which is used to provide seepage water pressure to the outer surface of the full-size composite lining in the anti-seepage performance detection device; the seepage monitoring device includes a fiber grating seepage pressure sensor pre-buried in the full-size composite lining, which is used to obtain the pressure data of pore water at different depths inside the full-size composite lining; the CNC platform is connected to the seepage loading device and the seepage monitoring device.

[0007] Furthermore, the bottom side of the flange portion is provided with a first convex ring on the outside, a second convex ring on the inside, and a first ring groove formed between the first convex ring and the second convex ring; the lower cover is provided with a second ring groove at a position corresponding to the first convex ring, a third ring groove at a position corresponding to the second convex ring, and a third convex ring corresponding to the first ring groove formed between the second ring groove and the third ring groove; a first sealing ring is provided between the first convex ring and the second ring groove, a second sealing ring is provided between the second convex ring and the third ring groove, and a third sealing ring is provided between the first ring groove and the third convex ring.

[0008] Furthermore, a filler is provided between the sleeve assembly and the full-size composite lining for filling the gap therebetween; a sealing rubber ring is also wrapped around the outer circumference of the full-size composite lining for sealing between the inner wall of the sleeve assembly and the outer circumference of the full-size composite lining.

[0009] Furthermore, the detection equipment also includes an axial pressure loading device; the axial pressure loading device includes a gantry and a jack installed on the bottom side of the gantry beam, and the jack is used to press the inverted full-size composite lining into the inverted sleeve assembly; the axial pressure loading device also includes a pressure transmission seat installed on the bottom side of the working end of the jack; the pressure transmission seat is used to act on the top side of the sleeve assembly under the drive of the jack, so that the sleeve assembly is in close contact with the lower cover, and then the bolt fasteners between the sleeve assembly and the lower cover are tightened for the second time; the axial pressure loading device is connected to the CNC platform circuit.

[0010] Furthermore, the pressure transfer seat includes a cross beam and a transfer ring; the bottom side of the working end of the jack is fixedly connected to the central area of ​​the top side of the cross beam; and the transfer ring corresponds to the top side of the sleeve assembly.

[0011] Furthermore, the detection equipment also includes a dragging device; the dragging device includes a dragging base and a dragging support; a fixed rail is provided on the dragging base, and a movable rail cooperating with the fixed rail is fixed to the bottom side of the dragging support; the dragging device also includes a dragging actuator, and the working end of the dragging actuator is fixed to the dragging support; the pressure transfer seat of the axial pressure loading device is located above the dragging device; the dragging actuator is used to drive the dragging support to move along the fixed rail to the bottom of the jack or move out from the bottom of the jack; the dragging device is connected to the CNC platform circuit.

[0012] Furthermore, the dragging actuator and the jack are both driven by hydraulic oil; the detection equipment also includes a hydraulic oil supply mechanism; the hydraulic oil supply mechanism includes a hydraulic pump and an oil tank, and the hydraulic oil supply mechanism is connected to the dragging actuator and the jack through oil circuits respectively.

[0013] Furthermore, the seepage loading device includes a pneumatic booster pump, a pneumatic booster valve cabinet and an air compression mechanism; the pneumatic booster valve cabinet is provided with a water inlet, a driving gas inlet, a pressure relief drain outlet and a pressure test water outlet; the high-pressure gas outlet of the air compression mechanism is connected to the driving gas inlet of the pneumatic booster valve cabinet through an air circuit; the pressure test water outlet and the pressure relief drain outlet are connected to the seepage interface through a pipeline.

[0014] Furthermore, the seepage monitoring device includes a fiber grating demodulator and a fiber grating junction box; the fiber grating demodulator, the fiber grating junction box, and the fiber grating seepage pressure sensor are connected through lines; the fiber grating demodulator is connected to the CNC platform line.

[0015] A method for testing the anti-seepage performance of a full-size composite lining structure, using the testing equipment as described above, is specifically carried out in the following steps:

[0016] S1. Using a mold to make a full-size composite lining that matches the sleeve assembly, wherein the manufacturing process of the full-size composite lining is: pouring a primary lining layer, a composite anti-seepage layer, and a secondary lining layer in the mold from bottom to top, and pre-embedding a fiber grating osmotic pressure sensor during the pouring process. After the pouring is completed, a moisturizing film is laid, sprayed and cured to a specified age, and then the film is removed, a layer of filler is applied to the outer peripheral surface of the full-size composite lining, and a sealing rubber ring is wrapped around it;

[0017] S2, start the dragging device to move the dragging support of the dragging device out from directly below the jack, hoist the sleeve assembly upside down on the dragging support, and hoist the full-size composite lining in step S1 into the inner cavity of the sleeve assembly; start the dragging device to move the dragging support of the dragging device to directly below the jack; start the axial pressure loading device, and use the jack to press the full-size composite lining into the sleeve assembly; when the full-size composite lining is pressed into place, the axial pressure loading device is reset;

[0018] S3, start the dragging device to move the dragging support out from directly below the jack, insert the sealing ring into the first ring groove of the sleeve assembly, and insert the permeable pad above the full-size composite lining in the sleeve assembly; then, lift the sleeve assembly loaded with the full-size composite lining off the dragging support and place it upright;

[0019] S4. Install the corresponding pipe at the seepage interface at the bottom of the lower cover, hoist the lower cover on the dragging support, and place sealing rings in the second ring groove and the third ring groove of the lower cover respectively; then hoist the sleeve assembly loaded with a full-size composite lining on the lower cover, aligning the corresponding bolt holes; and then fasten the sleeve assembly and the lower cover once with bolt fasteners;

[0020] S5. Install a pressure transfer seat on the bottom side of the working end of the jack; start the dragging device to move the dragging support of the dragging device to the bottom of the pressure transfer seat, start the axial pressure loading device, use the jack and the pressure transfer seat to press down the sleeve assembly, and perform secondary tightening on the bolt fastener;

[0021] S6, connecting the pipeline connected to the lower cover to the seepage loading device, connecting the fiber Bragg grating seepage pressure sensor of the full-size composite lining to the fiber Bragg grating junction box, and connecting the fiber Bragg grating junction box to the fiber Bragg grating demodulator;

[0022] S7. Input high-pressure water into the anti-seepage performance testing device through the seepage loading device, and control the water pressure as needed; turn on the seepage monitoring device to obtain the pore water pressure data at different depths inside the full-size composite lining.

[0023] Advantages of the present invention: The device and method for detecting the anti-seepage performance of a full-size composite lining structure of the present invention provide a reliable device for detecting the pore water pressure inside the full-size lining structure and the anti-seepage performance of the structure under high osmotic pressure; the design of a fitting sealing mode, initial tightening of fasteners and secondary tightening of axial pressure loading, etc., provide a strictly sealed environment for the anti-seepage performance test of the full-size composite lining structure; the seepage loading device can accurately adjust to the target pressure gradient to reduce pressure fluctuations, and the anti-seepage performance of the full-size composite lining structure can be more accurately tested by recording the pressure gradient on the upper and lower surfaces of the test piece and the data fed back by the fiber grating osmotic pressure sensor inside the full-size lining structure; the present invention can be used to test the anti-seepage performance of the full-size composite lining structure under different pressure gradients under the high osmotic pressure service environment on the seabed, providing a basis for the durability and safety evaluation of the lining structure; accurately evaluate the anti-seepage performance of the full-size composite lining structure under different pressure gradients, and provide technical support for the construction of submarine tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of a full-size composite lining structure anti-seepage performance testing device of this embodiment;

[0025] Figure 2 It is a three-dimensional schematic diagram of an anti-seepage performance testing device of a full-size composite lining structure anti-seepage performance testing device of this embodiment;

[0026] Figure 3 It is an exploded schematic diagram of an anti-seepage performance testing device of a full-size composite lining structure anti-seepage performance testing device of this embodiment;

[0027] Figure 4 This is a three-dimensional schematic diagram of the lower cover of a full-size composite lining structure anti-seepage performance testing device of this embodiment;

[0028] Figure 5 It is a three-dimensional schematic diagram of a dragging device and an axial pressure loading device of a full-size composite lining structure anti-seepage performance testing device of this embodiment;

[0029] Figure 6 It is a three-dimensional schematic diagram of a pressure transmission seat of a full-size composite lining structure anti-seepage performance testing device of this embodiment;

[0030] Figure 7 It is a three-dimensional schematic diagram of another angle of a full-size composite lining structure anti-seepage performance testing device of this embodiment;

[0031] Figure 8 This is a schematic diagram of pipeline connection of a full-size composite lining structure anti-seepage performance testing device of this embodiment;

[0032] Among them, 1-anti-seepage performance detection device, 2-dragging device, 3-axial pressure loading device, 4-seepage loading device, 5-seepage monitoring device, 6-CNC platform, 7-hydraulic oil supply mechanism, 8-full-size composite lining, 9-permeable pad, 11-sleeve assembly, 12-lower cover, 13-bolt fastener, 14-first sealing ring, 15-second sealing ring, 16-third sealing ring, 111-sleeve part, 112-flange part, 113-first convex ring, 114-second convex ring, 115-first ring groove, 121-seepage Interface, 122-second annular groove, 123-third annular groove, 124-third convex ring, 21-drag base, 22-drag support, 23-drag actuator, 211-fixed rail, 221-movable rail, 31-gantry, 32-jack, 33-pressure transfer seat, 331-cross beam, 332-transfer ring, 41-air compressor mechanism, 51-fiber grating demodulator, 52-fiber grating junction box, 53-fiber grating seepage pressure sensor, 81-primary lining layer, 82-composite anti-seepage layer, 83-secondary lining layer. DETAILED DESCRIPTION

[0033] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0034] Example

[0035] Please refer to Figures 1 to 8 As shown, this embodiment provides a full-size composite lining structure anti-seepage performance testing device, including an anti-seepage performance testing device 1, a seepage loading device 4, a seepage monitoring device 5 and a numerical control platform 6; the anti-seepage performance testing device 1 includes a sleeve assembly 11 and a lower cover 12; the sleeve assembly 11 includes a conical sleeve portion 111 with a small upper diameter and a large lower diameter and a flange portion 112 located at the bottom side of the sleeve portion; the lower cover 12 is a blind flange; a seepage interface 121 is provided in the middle area of ​​the lower cover 12; the sleeve assembly 11 is fixedly connected to the lower cover 12 by means of the flange portion 112 through bolt fasteners 13; the sleeve assembly 11 is used A full-size composite lining 8 is loaded; the bottom side of the full-size composite lining 8 is the outer surface, and the top side is the inner surface; the outer periphery of the full-size composite lining 8 is sealed with the inner wall of the sleeve assembly 11; the seepage loading device 4 is connected to the seepage interface 121 through a pipeline, which is used to provide seepage water pressure to the outer surface of the full-size composite lining 8 in the anti-seepage performance detection device 1; the seepage monitoring device 5 includes a fiber grating seepage pressure sensor 53 pre-buried in the full-size composite lining 8, which is used to obtain the pressure data of pore water at different depths inside the full-size composite lining; the CNC platform 6 is connected to the seepage loading device 4 and the seepage monitoring device 5.

[0036] Refer to Figure 3 and Figure 4 As shown, the bottom side of the flange portion 112 is provided with an outer first convex ring 113, an inner second convex ring 114, and a first annular groove 115 formed between the first convex ring 113 and the second convex ring 114; the lower cover 12 is provided with a second annular groove 122 at a position corresponding to the first convex ring 113, a third annular groove 123 at a position corresponding to the second convex ring 114, and a third convex ring 124 corresponding to the first annular groove 115 formed between the second annular groove 122 and the third annular groove 123; a first sealing ring 14 is provided between the first convex ring 113 and the second annular groove 122, a second sealing ring 15 is provided between the second convex ring 114 and the third annular groove 123, and a third sealing ring 16 is provided between the first annular groove 115 and the third convex ring 124. In this embodiment, the first sealing ring and the second sealing ring between the first convex ring 113 and the second annular groove 122 and between the second convex ring 114 and the third annular groove 123 are both made of graphite metal wound gaskets; a polyurethane rubber sealing ring is used between the first annular groove 115 and the third convex ring 124.

[0037] In the full-size composite lining structure anti-seepage performance testing equipment of the present embodiment, a filler for filling the gap between the sleeve assembly 11 and the full-size composite lining 8 is also provided; a sealing rubber ring is also wrapped around the outer peripheral side of the full-size composite lining 8 for sealing between the inner wall of the sleeve assembly 11 and the outer peripheral side of the full-size composite lining 8.

[0038] Refer to Figure 1 , Figure 5 and Figure 8 As shown, the detection equipment also includes an axial pressure loading device 3; the axial pressure loading device 3 includes a gantry 31 and a jack 32 installed on the bottom side of the crossbeam of the gantry 31, and the jack 32 is used to press the inverted full-size composite lining 8 into the inverted sleeve assembly 11; the axial pressure loading device 3 also includes a pressure transmission seat 33 installed on the bottom side of the working end of the jack; the pressure transmission seat 33 is used to act on the top side of the sleeve assembly 11 under the drive of the jack, so that the sleeve assembly 11 is in close contact with the lower cover 12, and then the bolt fasteners between the sleeve assembly 11 and the lower cover 12 are tightened for the second time; the axial pressure loading device 3 is connected to the CNC platform 6 line.

[0039] Refer to Figure 6 As shown, the pressure transfer seat 33 includes a cross beam 331 and a transfer ring 332; the bottom side of the working end of the jack 32 is fixedly connected to the central area of ​​the top side of the cross beam 331; and the transfer ring 332 corresponds to the top side of the sleeve assembly 11.

[0040] Refer to Figure 1 , Figure 5 and Figure 8As shown, the detection device also includes a drag device 2; the drag device 2 includes a drag base 21 and a drag support 22; a fixed rail 211 is provided on the drag base 21, and a movable rail 221 cooperating with the fixed rail is fixed to the bottom side of the drag support 22; the drag device 2 also includes a drag actuator 23, and the working end of the drag actuator 23 is fixed to the drag support 22; the pressure transfer seat 33 of the axial pressure loading device 3 is located above the drag device 2; the drag actuator 23 is used to drive the drag support 22 to move along the fixed rail to the bottom of the jack 32 or move out from the bottom of the jack 32; the drag device 2 is connected to the CNC platform 6 line;

[0041] Refer to Figure 1 and Figure 8 As shown, the dragging actuator 23 and the jack 32 are both driven by hydraulic oil; the detection equipment also includes a hydraulic oil supply mechanism 7; the hydraulic oil supply mechanism 7 includes a hydraulic pump and an oil tank, and the hydraulic oil supply mechanism 7 is connected to the dragging actuator 23 and the jack 32 through oil circuits respectively.

[0042] Refer to Figure 7 and Figure 8 As shown, the seepage loading device 4 includes a pneumatic booster pump, a pneumatic booster valve cabinet and an air compression mechanism 41; the pneumatic booster valve cabinet is provided with a water inlet, a driving gas inlet, a pressure relief drain outlet and a pressure test outlet; the high-pressure gas outlet of the air compression mechanism 41 is connected to the driving gas inlet of the pneumatic booster valve cabinet through an air circuit; the pressure test outlet and the pressure relief drain outlet are connected to the seepage interface 121 through a pipeline. In this embodiment, a pressure sensor is also provided on the pipeline between the pressure test outlet and the seepage interface, and a pressure sensor is also provided on the air circuit between the high-pressure gas outlet and the driving gas inlet, and the two pressure sensors are respectively connected to the numerical control platform 6 through lines.

[0043] Refer to Figure 7 and Figure 8 As shown, the seepage monitoring device 5 includes a fiber Bragg grating demodulator 51 and a fiber Bragg grating assembly box 52; the fiber Bragg grating demodulator 51, the fiber Bragg grating assembly box 52, and the fiber Bragg grating seepage pressure sensor 53 are connected through lines; the fiber Bragg grating demodulator 51 is connected to the numerical control platform 6 through lines. In this embodiment, the fiber Bragg grating assembly box 52 is arranged on the pressure transmission seat 33.

[0044] This embodiment also provides a method for testing the anti-seepage performance of a full-size composite lining structure, using the above-mentioned testing equipment, and specifically performing the following steps:

[0045] S1. Use a mold to make a full-size composite lining that matches the sleeve assembly, wherein the manufacturing process of the full-size composite lining is: pouring the primary lining layer 81, the composite anti-seepage layer 82, and the secondary lining layer 83 in the mold from bottom to top, and pre-embedding the fiber grating osmotic pressure sensor during the pouring process. After the pouring is completed, lay a moisturizing film, spray and maintain it to a specified age, then remove the film, apply a layer of filler on the outer peripheral surface of the full-size composite lining, and wrap it with a sealing rubber ring; wherein the filler can be rosin, and the sealing rubber ring is three layers;

[0046] S2, start the dragging device to move the dragging support of the dragging device out from directly below the jack, hoist the sleeve assembly upside down on the dragging support, and hoist the full-size composite lining in step S1 into the inner cavity of the sleeve assembly; start the dragging device to move the dragging support of the dragging device to directly below the jack; start the axial pressure loading device, and use the jack to press the full-size composite lining into the sleeve assembly; when the full-size composite lining is pressed into place, the axial pressure loading device is reset;

[0047] S3, start the dragging device to move the dragging support out from directly below the jack, insert the sealing ring into the first ring groove of the sleeve assembly, and insert the permeable pad 9 above the full-size composite lining in the sleeve assembly; then, lift the sleeve assembly loaded with the full-size composite lining off the dragging support and put it upright;

[0048] S4. Install the corresponding pipe at the seepage interface at the bottom of the lower cover, hoist the lower cover on the dragging support, and place sealing rings in the second ring groove and the third ring groove of the lower cover respectively; then hoist the sleeve assembly loaded with a full-size composite lining on the lower cover, aligning the corresponding bolt holes; and then fasten the sleeve assembly and the lower cover once with bolt fasteners;

[0049] S5. Install a pressure transfer seat on the bottom side of the working end of the jack; start the dragging device to move the dragging support of the dragging device to the bottom of the pressure transfer seat, start the axial pressure loading device, use the jack and the pressure transfer seat to press down the sleeve assembly, and perform secondary tightening on the bolt fastener;

[0050] S6, connecting the pipeline connected to the lower cover to the seepage loading device, connecting the fiber Bragg grating seepage pressure sensor of the full-size composite lining to the fiber Bragg grating junction box, and connecting the fiber Bragg grating junction box to the fiber Bragg grating demodulator;

[0051] S7. Input high-pressure water into the anti-seepage performance testing device through the seepage loading device, and control the water pressure as needed; turn on the seepage monitoring device to obtain the pore water pressure data at different depths inside the full-size composite lining.

[0052] In this embodiment, after completing the anti-seepage performance test, the bolt fasteners are removed, the axial pressure loading device is reset, the dragging device is started to move the dragging support out from directly below the pressure transfer seat, the sleeve assembly loaded with the full-size composite lining is lifted off, and the permeable pad is taken out; then the sleeve assembly loaded with the full-size composite lining is lifted back onto the lower cover, the pressure transfer seat is removed, the dragging device is started to move the dragging support of the dragging device to directly below the jack, the axial pressure loading device is started to push the full-size composite lining off the sleeve assembly, and then the sleeve assembly, the full-size composite lining and the lower cover are lifted off.

[0053] The above embodiments should not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent conversion shall fall within the protection scope of the present invention.

Claims

1. A full-size composite lining structure anti-seepage performance testing device, characterized by: It includes an anti-seepage performance detection device, a seepage loading device, a seepage monitoring device and a numerical control platform; the anti-seepage performance detection device includes a sleeve assembly and a lower cover; the sleeve assembly includes a conical sleeve portion with a small upper diameter and a large lower diameter and a flange portion located at the bottom side of the sleeve portion; the lower cover is a blind flange; a seepage interface is arranged in the middle area of ​​the lower cover; the sleeve assembly is fixedly connected to the lower cover by means of a flange portion through bolt fasteners; the sleeve assembly is used to load a full-size composite lining; the bottom side of the full-size composite lining is the outer surface and the top side is the inner surface; the outer periphery of the full-size composite lining is sealed with the inner wall of the sleeve assembly; the seepage loading device is connected to the seepage interface through a pipeline, and is used to provide seepage water pressure to the outer surface of the full-size composite lining in the anti-seepage performance detection device; the seepage monitoring device includes a fiber Bragg grating seepage pressure sensor pre-buried in the full-size composite lining, and is used to obtain the pressure data of pore water at different depths inside the full-size composite lining; the numerical control platform is connected to the seepage loading device and the seepage monitoring device.

2. According to claim 1, a full-scale composite lining structure anti-seepage performance testing device is characterized by: The bottom side of the flange portion is provided with a first convex ring closer to the outside, a second convex ring closer to the inside, and a first ring groove formed between the first convex ring and the second convex ring; the lower cover is provided with a second ring groove at a position corresponding to the first convex ring, a third ring groove at a position corresponding to the second convex ring, and a third convex ring corresponding to the first ring groove formed between the second ring groove and the third ring groove; a first sealing ring is provided between the first convex ring and the second ring groove, a second sealing ring is provided between the second convex ring and the third ring groove, and a third sealing ring is provided between the first ring groove and the third convex ring.

3. The full-scale composite lining structure anti-seepage performance testing device according to claim 2 is characterized by: A filler is also provided between the sleeve assembly and the full-size composite lining for filling the gap therebetween; a sealing rubber ring is also wrapped around the outer circumference of the full-size composite lining for sealing between the inner wall of the sleeve assembly and the outer circumference of the full-size composite lining.

4. The full-scale composite lining structure anti-seepage performance testing device according to claim 3 is characterized by: The detection equipment also includes an axial pressure loading device; the axial pressure loading device includes a gantry and a jack installed on the bottom side of the gantry beam, and the jack is used to press the inverted full-size composite lining into the inverted sleeve assembly; the axial pressure loading device also includes a pressure transmission seat installed on the bottom side of the working end of the jack; the pressure transmission seat is used to act on the top side of the sleeve assembly under the drive of the jack, so that the sleeve assembly is in close contact with the lower cover, and then the bolt fasteners between the sleeve assembly and the lower cover are tightened for the second time; the axial pressure loading device is connected to the CNC platform circuit.

5. The full-scale composite lining structure anti-seepage performance testing device according to claim 4 is characterized by: The pressure transfer seat includes a cross beam and a transfer ring; the bottom side of the working end of the jack is fixedly connected to the central area of ​​the top side of the cross beam; and the transfer ring corresponds to the top side of the sleeve assembly.

6. The full-scale composite lining structure anti-seepage performance testing device according to claim 5 is characterized by: The detection equipment also includes a dragging device; the dragging device includes a dragging base and a dragging support; a fixed rail is arranged on the dragging base, and a movable rail cooperating with the fixed rail is fixed on the bottom side of the dragging support; the dragging device also includes a dragging actuator, and the working end of the dragging actuator is fixed to the dragging support; the pressure transfer seat of the axial pressure loading device is located above the dragging device; the dragging actuator is used to drive the dragging support to move along the fixed rail to the bottom of the jack or move out from the bottom of the jack; the dragging device is connected to the CNC platform circuit.

7. The full-scale composite lining structure anti-seepage performance testing device according to claim 6 is characterized by: The dragging actuator and the jack are both driven by hydraulic oil; the detection equipment also includes a hydraulic oil supply mechanism; the hydraulic oil supply mechanism includes a hydraulic pump and an oil tank, and the hydraulic oil supply mechanism is connected to the dragging actuator and the jack through oil circuits respectively.

8. The full-scale composite lining structure anti-seepage performance testing device according to claim 6 is characterized by: The seepage loading device includes a pneumatic booster pump, a pneumatic booster valve cabinet and an air compression mechanism; the pneumatic booster valve cabinet is provided with a water inlet, a driving gas inlet, a pressure relief drain outlet and a pressure test water outlet; the high-pressure gas outlet of the air compression mechanism is connected to the driving gas inlet of the pneumatic booster valve cabinet through an air circuit; the pressure test water outlet and the pressure relief drain outlet are connected to the seepage interface through a pipeline.

9. The full-scale composite lining structure anti-seepage performance testing device according to claim 6, characterized in that: The seepage monitoring device comprises a fiber grating demodulator and a fiber grating junction box; the fiber grating demodulator, the fiber grating junction box and the fiber grating seepage pressure sensor are connected through lines; the fiber grating demodulator is connected to the numerical control platform line.

10. A method for testing the anti-seepage performance of a full-size composite lining structure, using the testing equipment as described in any one of claims 6 to 9, specifically following the steps below: S1. Use a mold to make a composite lining of sufficient size to match the sleeve assembly, wherein: The manufacturing process of the full-size composite lining is as follows: pouring the primary lining layer, the composite anti-seepage layer, and the secondary lining layer in the mold from bottom to top in sequence, and pre-embedding the fiber grating osmotic pressure sensor during the pouring process, after the pouring is completed, laying a moisturizing film, spraying and curing to a specified age, then removing the film, brushing a layer of filler on the outer peripheral surface of the full-size composite lining, and wrapping a sealing rubber ring; S2, start the dragging device to move the dragging support of the dragging device out from directly below the jack, lift the sleeve assembly upside down on the dragging support, and lift the full-size composite lining in step S1 into the inner cavity of the sleeve assembly; Start the dragging device to move the dragging support of the dragging device to the position directly below the jack; start the axial pressure loading device and use the jack to press the full-size composite lining into the sleeve assembly; when the full-size composite lining is pressed into place, the axial pressure loading device is reset; S3, start the dragging device to move the dragging support out from directly below the jack, insert the sealing ring into the first ring groove of the sleeve assembly, and insert the permeable pad above the full-size composite lining in the sleeve assembly; then, lift the sleeve assembly loaded with the full-size composite lining off the dragging support and place it upright; S4. Install the corresponding pipe at the seepage interface at the bottom of the lower cover, hoist the lower cover on the dragging support, and place sealing rings in the second ring groove and the third ring groove of the lower cover respectively; then hoist the sleeve assembly loaded with a full-size composite lining on the lower cover, aligning the corresponding bolt holes; and then fasten the sleeve assembly and the lower cover once with bolt fasteners; S5. Install a pressure transfer seat on the bottom side of the working end of the jack; start the dragging device to move the dragging support of the dragging device to the bottom of the pressure transfer seat, start the axial pressure loading device, use the jack and the pressure transfer seat to press down the sleeve assembly, and perform secondary tightening on the bolt fastener; S6, connecting the pipeline connected to the lower cover to the seepage loading device, and connecting the fiber grating seepage pressure sensor of the composite lining of sufficient size to the seepage monitoring device; S7. Input high-pressure water into the anti-seepage performance testing device through the seepage loading device, and control the water pressure as needed; turn on the seepage monitoring device to obtain the pore water pressure data at different depths inside the full-size composite lining.

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