A test device and method for simulating the cracking process of surrounding rock lining combined structure

Abstract

The present invention discloses a test device and method for simulating the cracking process of a surrounding rock-lining combined structure, which belongs to the technical field of water conservancy engineering and can solve the problem that the existing test device cannot accurately simulate the cracking process and leakage of a reinforced concrete lining structure under a surrounding rock-lining combined stress structure. The device comprises: a test box having an opening on one side; a sample module arranged in the test box, which comprises a simulated lining and a top plate and a bottom plate for sealing two ports of the simulated lining; a water supply module for providing test water to the simulated lining, wherein the test water contains a plurality of magnetic particles of different particle sizes; a support module, which is cylindrically sleeved on the outer wall of the simulated lining and is used to support the simulated lining; a sensing module, which is arranged on the bottom wall of the test box outside the simulated lining and is located on the inner side of the outer wall surface of the support module, and is used to sense the magnetic particles flowing out from the gap of the simulated lining crack. The present invention is used for a simulation test of the cracking process of a surrounding rock-lining combined structure.

Description

Technical Field

[0001] The invention relates to a test device and a method for simulating the cracking process of a surrounding rock lining combined structure, belonging to the technical field of water conservancy engineering. Background Art

[0002] With the sustained and rapid development of the economy, my country's demand for energy is also increasing. As a clean energy, hydropower energy has been increasingly developed and utilized. As one of the most common water diversion structures in water conservancy and hydropower projects, the safe and reasonable operation of hydraulic pressure tunnels is of great significance.

[0003] The use of reinforced concrete lining is one of the main structural types of hydraulic pressure tunnels. The buried hydraulic tunnels need to be designed in combination with the surrounding rock conditions, giving full play to the bearing capacity of the surrounding rock and reducing the stress on the reinforced concrete lining, further controlling the formation of cracks in the concrete lining structure, and ensuring the long-term operation of the project. At present, the cracking research of reinforced concrete lining structures is basically based on simulation analysis or the use of preset cracks. Neither of them can accurately reflect the cracking process. Lining cracking is related to the bearing capacity of the surrounding rock, water filling speed, time, and pressure. In addition, clarifying the leakage process is also crucial for the use of reinforced concrete lining structures. At present, there is no relevant experimental device that can simulate the cracking process and leakage of reinforced concrete lining structures under the surrounding rock-concrete combined stress structure. Summary of the invention

[0004] The present invention provides a test device and method for simulating the cracking process of a surrounding rock-lining combined structure, which can solve the problem that the existing test device cannot accurately simulate the cracking process and leakage of a reinforced concrete lining structure under a surrounding rock-lining combined stress structure.

[0005] In one aspect, the present invention provides a test device for simulating the cracking process of a surrounding rock lining combined structure, the device comprising:

[0006] A test chamber having an opening on one side;

[0007] A sample module is arranged in the test box, and comprises a simulated lining and a top plate and a bottom plate for sealing two ports of the simulated lining; a water inlet is arranged on the top plate, and a water outlet is arranged on the bottom plate;

[0008] A water supply module, whose water inlet pipe passes through the top wall of the test box and is connected to the water inlet, and whose water outlet pipe passes through the bottom wall of the test box and is connected to the water outlet, and is used to provide test water into the simulated lining, wherein the test water contains magnetic particles of various sizes;

[0009] A support module is sleeved on the outer wall of the simulated lining in a cylindrical shape, and its outer wall surface is sealed and connected to the top wall and the bottom wall of the test box, and is used to support the simulated lining;

[0010] The sensing module is arranged on the bottom wall of the test box outside the simulated lining and located inside the outer wall surface of the support module, and is used to sense the magnetic particles flowing out from the cracks of the simulated lining.

[0011] Optionally, the device further comprises:

[0012] The force applying module is arranged on the outer wall surface of the supporting module and is used for applying radial supporting force to the supporting module.

[0013] Optionally, the force-applying module includes a plurality of force-transmitting members, which are distributed around an outer wall surface of the supporting module and are used to apply radial supporting force to the supporting module.

[0014] Optionally, the support module includes multiple support tubes with different cross-sectional sizes, and the multiple support tubes are sequentially mounted on the outside of the simulated lining in order from small to large cross-sectional sizes, and the two ends of the support tubes are respectively connected to the top wall and the bottom wall of the test box; adjacent support tubes are tightly fitted and snap-connected.

[0015] Optionally, the outermost support tube is a water-impermeable rigid structure; the remaining support tubes are water-permeable rigid structures.

[0016] Optionally, each support tube is assembled from a plurality of standard curved plates.

[0017] Optionally, magnetic particles of different particle sizes are coated with different colors.

[0018] Optionally, a water collecting box is provided on the bottom wall of the test box, and the water collecting box is connected with the interior of the support module through a water collecting pipe; a pressurizing device is provided on the water collecting pipe; and a flow monitoring device is provided on the water collecting box.

[0019] Optionally, a first gravity sensor is provided in the inner area of ​​the simulated lining; a second gravity sensor is provided on the bottom wall of the test box at a position corresponding to the support module; and a third gravity sensor is provided at the bottom of the water collecting tank.

[0020] Optionally, the induction module is an induction magnetic coil.

[0021] Optionally, the inner wall surface of the support module is coated with a composite adhesive layer.

[0022] Optionally, a telescopic tube is provided on both the top wall and the bottom wall of the test box, the telescopic tube on the top wall of the test box is connected to the water inlet, and the telescopic tube on the bottom wall of the test box is connected to the water outlet.

[0023] Optionally, the water supply module includes:

[0024] A water tank containing test water;

[0025] A water inlet pipe, one end of which is connected to the water tank outlet, and the other end of which is connected to the telescopic pipe on the top wall of the test box through a connector; a pressurizing device is provided on the water inlet pipe, and the pressurizing device is used to pressurize the water flow in the water inlet pipe;

[0026] A water outlet pipe has one end connected to the water tank inlet and the other end connected to the telescopic pipe on the bottom wall of the test box through a connector; a pressure relief device is provided on the water outlet pipe, and the pressure relief device is used to relieve the pressure of the water flow in the water outlet pipe.

[0027] On the other hand, the present invention provides a test method for a test device for simulating the cracking process of a surrounding rock lining combined structure based on any one of the above-mentioned test devices, the method comprising:

[0028] S1. Control the water supply module to inject test water into the sample module;

[0029] S2. Turn on the sensing module to sense the magnetic particles flowing out of the gaps simulating the cracks in the lining, and obtain the gravity values ​​sensed by the second gravity sensor and the third gravity sensor.

[0030] The beneficial effects that the present invention can produce include:

[0031] The test device for simulating the cracking process of the surrounding rock lining combined structure provided by the present invention simulates the cracking and generating gaps of the hydraulic tunnel during the filling, operation and drainage process through the water supply module and the sample module, and simulates the surrounding rock to support the simulated lining through the support module, and finally determines the cracking of the simulated lining through the magnetic particle size sensed by the sensing module. The device can be recycled and reused, saves costs, and is simple to operate. At the same time, it takes into account the bearing capacity of the surrounding rock and the external water pressure, and can truly simulate the different processes of filling, operation and drainage of the hydraulic tunnel. It has high practicality and great promotion value. Because the device can simulate the influence of the crack expansion process of the concrete structure under different geological environments and different operation stages, and intuitively reflects the crack width and leakage under different influencing factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the elevation structure of a test device provided in an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the planar structure of a test device provided in an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the structure of a sample module provided in an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of the elevation structure of a support module and a force application module provided in an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of the planar structure of a support module and a force-applying module provided in an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of a standard curved plate facade structure provided by an embodiment of the present invention;

[0038] Figure 7 A schematic diagram of a plane structure of a standard curved plate provided in an embodiment of the present invention;

[0039] Figure 8 A schematic diagram of the elevation structure of a test box provided in an embodiment of the present invention;

[0040] Fig. 9 A schematic diagram of the planar structure of a test box provided in an embodiment of the present invention.

[0041] Reference numerals:

[0042] 10. Test box; 11. First side plate; 12. Second side plate; 13. Third side plate; 14. Top wall; 15. Bottom wall; 16. Water inlet; 17. Water outlet; 20. Sample module; 21. Simulated lining; 22. Top plate; 23. Bottom plate; 24. Water inlet; 25. Water outlet; 26. Water stop; 31. Water tank; 32. Water inlet pipe; 33. Pressurizing equipment; 34. Connectors; 35. Water outlet pipe; 36. Pressure relief equipment; 40. Support module; 41. Support cylinder; 411. Standard arc plate; 412. Annular connecting groove; 413. Annular connecting protrusion; 414. Radial connecting groove; 415. Radial connecting protrusion; 42. Top fixing structure; 43. Bottom fixing structure; 51. Induction magnetic ring; 61. First gravity sensor; 62. Second gravity sensor; 63. Third gravity sensor; 71. Water collecting trough; 72. Water collecting box; 73. Sealing cover plate; 74. Pressurizing unit; 81. Force transmission member. DETAILED DESCRIPTION

[0043] The present invention is described in detail below in conjunction with embodiments, but the present invention is not limited to these embodiments.

[0044] The embodiment of the present invention provides a test device for simulating the cracking process of the surrounding rock lining combined structure, such as Figures 1 to 9 As shown, the device comprises:

[0045] The test box 10 has an opening on one side.

[0046] Specifically, the test box 10 is an open rigid structure formed by a bottom wall 15, a top wall 14, a first side panel 11, a second side panel 12 and a third side panel 13, and its material and size are not limited, but it can be recycled and reused to accommodate samples of various sizes.

[0047] The sample module 20 is arranged in the test box 10, and includes a simulated lining 21 and a top plate 22 and a bottom plate 23 for sealing two ports of the simulated lining 21; a water inlet 24 is arranged on the top plate 22, and a water outlet 25 is arranged on the bottom plate 23.

[0048] Specifically, the sample module 20 is composed of a simulated lining 21 (reinforced concrete lining), an anti-seepage bottom plate 23, and an anti-seepage top plate 22. The anti-seepage bottom plate 23 and the anti-seepage top plate 22 are consistent with the cross-sectional size and shape of the simulated lining 21, and have a certain anti-seepage ability. For example, a steel lining + concrete composite structure can be adopted, and a water stop 26 is provided on the contact surface with the simulated lining 21. For example, two continuous copper water stop sheets can be arranged on the contact surface with the simulated lining 21 for sealing.

[0049] The water supply module, whose water inlet pipe 32 passes through the top wall 14 of the test box and is connected to the water inlet 24, and whose water outlet pipe 35 passes through the bottom wall 15 of the test box and is connected to the water outlet 25, is used to provide test water to the simulated lining 21, and the test water contains magnetic particles of various particle sizes. Among them, the magnetic particles of different particle sizes are coated with different colors. The embodiment of the present invention does not limit the particle content in the test water.

[0050] In the embodiment of the present invention, telescopic tubes are provided on both the top wall 14 and the bottom wall 15 of the test box. The telescopic tube on the top wall 14 of the test box is connected to the water inlet 24 , and the telescopic tube on the bottom wall 15 of the test box is connected to the water outlet 25 .

[0051] Specifically, the water supply module includes: a water tank 31, which contains test water; a water inlet pipe 32, one end of which is connected to the outlet of the water tank 31, and the other end is connected to the telescopic tube on the top wall 14 of the test box through a connecting piece 34; a pressurizing device 33 is provided on the water inlet pipe 32, and the pressurizing device 33 is used to pressurize the water flow in the water inlet pipe 32; a water outlet pipe 35, one end of which is connected to the inlet of the water tank 31, and the other end is connected to the telescopic tube on the bottom wall 15 of the test box through a connecting piece 34; a pressure relief device 36 is provided on the water outlet pipe 35, and the pressure relief device 36 is used to relieve the pressure of the water flow in the water outlet pipe 35.

[0052] In actual application, water inlet holes 16 and water outlet holes 17 are reserved at the centerline positions of the top wall 14 and the bottom wall 15 of the test box respectively; the telescopic tube at the top is penetrated at the water inlet 24 of the impermeable top plate 22, and is integrally formed with the impermeable top plate 22 to achieve sealing at the connection, and the other end of the telescopic tube is penetrated on the water inlet hole 16 of the top wall 14 of the test box; the telescopic tube at the bottom is penetrated at the water outlet 25 of the impermeable bottom plate 23, and is integrally formed with the impermeable bottom plate 23 to achieve sealing at the connection, and the other end of the telescopic tube is penetrated on the water outlet hole 17 of the bottom wall 15 of the test box. The telescopic tube is provided to facilitate the sample module 20 to enter the test box 10 from the side thereof, so as to facilitate the installation of the sample module 20; the water inlet pipe 32 of the pressurizing device 33 and the water outlet pipe 35 of the pressure relief device are respectively connected to the telescopic tubes on the impermeable top plate 22 and the impermeable bottom plate 23 through the connector 34. The telescopic tube can be a steel water pipe. The water supply module can control the speed, time, pressure, flow rate, etc. of the pressurized water delivered to the sample module 20, thereby being able to simulate the water dynamic process well.

[0053] The support module 40 is cylindrically sleeved on the outer wall of the simulated lining 21 , and its outer wall surface is sealedly connected to the top wall 14 and the bottom wall 15 of the test box, so as to support the simulated lining 21 .

[0054] Specifically, the support module 40 includes a plurality of support tubes 41 with different cross-sectional sizes. The plurality of support tubes 41 are sequentially sleeved on the outside of the simulated lining 21 according to the cross-sectional size from small to large, and the two ends thereof are respectively connected to the top wall 14 and the bottom wall 15 of the test box; adjacent support tubes 41 are tightly fitted and snap-connected.

[0055] The outermost support tube 41 is a water-impermeable rigid structure, and the remaining support tubes 41 are water-permeable rigid structures. The inner wall surface of the innermost support tube 41 is coated with a composite adhesive layer, which can be used to simulate the bonding force between the sample concrete and the surrounding rock.

[0056] The above-mentioned support module 40 is composed of a plurality of support tubes 41. By adjusting the number of layers of the support tubes 41, different sizes of the simulated lining 21 can be adapted. The support tubes 41 are reusable. Each support tube 41 is a rigid structure with the same height and a hollow circular ring cross section. The cross section radius increases outward along the cross section of the simulated lining 21. The thickness of each layer of the support tube 41 is not limited and can be the same or different. It can be flexibly adjusted according to the size of the simulated lining 21 applicable to the device.

[0057] Preferably, each support tube 41 is assembled from a plurality of standard arc-shaped plates 411 .

[0058] Specifically, each support tube 41 is assembled into a whole by four identical standard arc plates 411 in the circumferential direction, and the adjacent standard arc plates 411 in the circumferential direction are connected by the circumferential connection groove 412 and the circumferential connection protrusion 413 to form the support tube 41. The adjacent support tubes 41 in the radial direction are connected and assembled into a whole by the radial connection groove 414 and the radial connection protrusion 415, i.e., the support module 40. The position of the vertical fixing structure of the support tube 41 is reserved on the top wall 14 and the bottom wall 15 of the test box, and each support tube 41 is connected to the test box 10 through the top fixing structure 42 and the bottom fixing structure 43, and the support tube 41 is fixed between the top wall 14 and the bottom wall 15 of the test box.

[0059] The outermost support tube 41 is a water-impermeable rigid structure, for example, it can be a steel plate + concrete structure, and during the test, sealing measures are required for the connection seam surface between the top of its outer wall surface and the top wall 14 of the test box. The installation position of the outermost support tube 41 is fixed and unique, so the diameter size of the simulated lining 21 can be adapted to the size change by installing different numbers of inner support tubes 41. The remaining inner support tubes 41 are all water-permeable rigid structures, for example, the remaining inner support tubes 41 can adopt a steel plate + concrete combination structure with reserved water holes, and no sealing measures are required for each connection seam surface.

[0060] Furthermore, the device further comprises: a force applying module, which is arranged on the outer wall surface of the supporting module 40 and is used to apply radial supporting force to the supporting module 40 .

[0061] Specifically, the force-applying module includes a plurality of force-transmitting members 81 , which are distributed around the outer wall surface of the support module 40 and are used to apply radial supporting force to the support module 40 .

[0062] The specific structure of the force transmission member 81 is not limited, as long as it can provide a set supporting force and monitor the specific value of the supporting force. For example, the force transmission member 81 can be a jack.

[0063] The sensing module is disposed on the bottom wall 15 of the test box outside the simulated lining 21 and located inside the outer wall surface of the support module 40 , and is used to sense the magnetic particles flowing out from the cracks of the simulated lining 21 .

[0064] In practical applications, the induction module may be an induction magnetic coil 51 .

[0065] A plurality of induction magnetic coils 51 with image capturing function or color distinguishing function and independently controllable magnetic force can be evenly installed on the bottom wall 15 of the test box to capture magnetic particles flowing out of the cracks during the cracking process and obtain the particle status in time.

[0066] In the embodiment of the present invention, a water collecting box 72 is provided on the bottom wall 15 of the test box, and the water collecting box 72 is connected to the inside of the support module 40 through a water collecting pipe; a pressurizing unit 74 is provided on the water collecting pipe; and a flow monitoring device is provided on the water collecting box 72. Specifically, the water collecting pipe is composed of a water collecting tank 71 and a sealing cover plate 73 provided on the water collecting tank 71.

[0067] A water collecting trough 71 is provided on the outside of the test box 10 near the outermost support tube 41, and a sealing cover plate 73 capable of bearing internal pressure is installed on the water collecting trough 71. The water collecting trough 71 is connected to a water collecting box 72, and a pressurizing unit 74 is provided on the water collecting trough 71 to simulate the external water pressure of the lining 21; a flow monitoring device is provided on the water collecting box 72 to measure the amount of water seepage.

[0068] Furthermore, a first gravity sensor 61 is provided in the inner area of ​​the simulated lining 21 ; a second gravity sensor 62 is provided on the bottom wall 15 of the test box at a position corresponding to the support module 40 ; and a third gravity sensor 63 is provided at the bottom of the water collecting box 72 .

[0069] Gravity sensors are installed near the center of the bottom wall 15 of the test box, at the position corresponding to the support module 40, and at the bottom of the water collecting box 72 to collect the gravity conditions in the corresponding area in real time and evaluate the leakage situation.

[0070] In practical applications, the device can also be connected to an external processor such as a computer to display, record and process data from devices such as pressure-increasing / relieving equipment, induction magnetic coils, and gravity sensors.

[0071] Before conducting a test to simulate the cracking process of the surrounding rock lining combined structure, it is necessary to prepare the test device and test the device.

[0072] (1) Test preparation:

[0073] 1) Check the sealing performance of the manufactured sample module 20.

[0074] Specifically, the sample module 20 is slowly filled with non-pressurized water and left to stand for 30 minutes to observe whether there is water seepage on the contact surface between the sample and the anti-seepage top plate 22 and the anti-seepage bottom plate 23. If there is no water seepage, it means that the sample module 20 has good sealing performance.

[0075] 2) Install the sample module 20 to the designated position, and take certain sealing measures at the connection between the outer ring and the test box 10. For example, a high-pressure sealing strip may be installed at the connection.

[0076] 3) According to the design requirements, select the support tube 41, and install it in the test box 10 in order from the inside to the outside according to the size of the support tube 41; and apply a layer of composite glue on the inner wall surface of the innermost support tube 41 to simulate the cohesion between the surrounding rock and the concrete. The composite glue can be mortar glue.

[0077] 4) The outer ring of the outermost support tube 41 adopts certain sealing measures at the inner connection seam surface of the ring and the connection with the top wall 14 of the test box, and is connected to the force transmission member 81. At the same time, according to the bearing capacity of the surrounding rock, the force transmission member 81 is adjusted to provide a preset resistance to the support tube 41, and the supporting force provided by each force transmission member 81 is the same.

[0078] 5) Prepare magnetic particles of different sizes, with the same number of each type of particles, and paint them with different colors respectively, add them into the water tank 31 according to a certain proportion, and then turn on the induction magnetic circle 51 close to the outer circle of the simulated lining 21.

[0079] For example, five sizes of magnetic particles (particle diameter d) can be prepared, 0.4mm≤d≤1mm (red), 0.3mm≤d<0.4mm (yellow), 0.2mm≤d<0.3mm (blue), 0.1mm≤d<0.2mm (green), d<0.1mm (purple), among which the particle content per m³ of water is 10%.

[0080] (2) Test device test:

[0081] 1) Debug the first gravity sensor 61 in the sample box to 0.

[0082] 2) Through the water collecting tank 72 and the pressurizing unit 74, a certain amount of water is slowly added to the water collecting tank 71 (the amount of water is the volume of water that can be stored inside the installed support tube 41 * 1.05), and the space between the support tube 41 and the simulated lining 21 is filled with water.

[0083] 3) After observing for 30 minutes, if there is no change in the first gravity sensor 61 and there is no water seepage in the outer ring of the outermost support tube 41, it means that the test device is well sealed. If the first gravity sensor 61 increases, it means that there is a problem with the sealing measures on the outside of the sample module 20; if water seepage is seen in the outer ring of the outermost support tube 41, it means that there is a problem with the outer sealing of the outermost support tube 41.

[0084] 4) Drain the water between the support tube 41 and the simulated lining 21; and drain the water in the water collecting tank 71 and the water collecting box 72.

[0085] 5) Adjust the first gravity sensor 61, the second gravity sensor 62 and the third gravity sensor 63 to 0.

[0086] Another embodiment of the present invention provides a test method based on any one of the above test devices for simulating the cracking process of a surrounding rock-lining combined structure, the method comprising:

[0087] S1. Control the water supply module to inject test water into the sample module 20.

[0088] The prepared test water containing magnetic particles is injected into the sample module 20 through the water inlet pipe 32 of the pressure device 33. According to the design requirements, the water injection speed and pressure can be controlled by the pressure adding / reducing device to simulate the water filling process of the hydraulic tunnel. The test water returns to the water tank 31 after passing through the pressure relief device 36, and the water is recycled.

[0089] S2 . Turn on the sensing module to sense the magnetic particles flowing out of the cracks in the simulated lining 21 , and obtain the gravity values ​​sensed by the second gravity sensor 62 and the third gravity sensor 63 .

[0090] As the water pressure increases, the simulated lining 21 gradually cracks, and the crack width of the hydraulic tunnel in operation can be determined by the particles attached to the induction magnetic ring 51 on the bottom wall 15 of the test box. For example, the induction magnetic ring 51 only obtains purple particles under the pressure P at time t, indicating that the simulated lining 21 under the pressure P has cracked, and the crack width is within 0.1mm. As the crack continues to open, multiple color particles can be obtained, and each color particle corresponds to a crack width.

[0091] The leakage situation can be grasped by the second gravity sensor 62 and the third gravity sensor 63; specifically, volume = gravity / density / gravitational acceleration. If the combined value of the second gravity sensor 62 and the third gravity sensor 63 is 12g, the leakage volume is about 12cm³.

[0092] In addition, according to the design conditions and the actual surrounding rock conditions of the project, when external water pressure needs to be considered, a certain external water pressure can be provided to the simulated lining 21 through the water collecting tank 71 in cooperation with the pressurizing unit 74 to observe the crack width. It is also possible to simulate the external water saturation state of the surrounding rock in combination with the actual situation, that is, the leakage reaches a specified value, and a certain external water pressure is provided to the simulated lining 21 by controlling the water collecting tank 71 in cooperation with the pressurizing unit 74 to observe the crack width.

[0093] In practical applications, according to test requirements, the water outlet speed and water outlet pressure can also be controlled by the pressure relief device 36 to simulate the water discharge process of the hydraulic tunnel and obtain the crack process.

[0094] The present invention simulates the cracking and gaps of hydraulic tunnels during water filling, operation and water discharge through the water supply module and the sample module 20, and simulates the surrounding rock to support the simulated lining 21 through the support module 40, and finally determines the cracking of the simulated lining 21 through the magnetic particle size sensed by the sensing module. The device can be recycled and reused, saving costs, and is simple to operate. At the same time, it takes into account the bearing capacity of the surrounding rock and the external water pressure, and can truly simulate the different processes of water filling, operation and water discharge of hydraulic tunnels. It has high practicality and great promotion value. Because the device can simulate the influence of the crack expansion process of concrete structures under different geological environments and different operation stages, and intuitively reflects the crack width and leakage under different influencing factors.

[0095] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A test device for simulating the cracking process of a surrounding rock lining joint structure, characterized in that: include: A test chamber having an opening on one side; A sample module is arranged in the test box, and comprises a simulated lining and a top plate and a bottom plate for sealing two ports of the simulated lining; a water inlet is arranged on the top plate, and a water outlet is arranged on the bottom plate; A water supply module, whose water inlet pipe passes through the top wall of the test box and is connected to the water inlet, and whose water outlet pipe passes through the bottom wall of the test box and is connected to the water outlet, and is used to provide test water to the simulated lining, wherein the test water contains magnetic particles of various different particle sizes; and the magnetic particles of different particle sizes are coated with different colors; A support module is sleeved on the outer wall of the simulated lining in a cylindrical shape, and its outer wall surface is sealed and connected to the top wall and the bottom wall of the test box, and is used to support the simulated lining; The sensing module is arranged on the bottom wall of the test box outside the simulated lining and is located inside the outer wall surface of the support module, and is used to sense the magnetic particles flowing out from the cracks of the simulated lining; The support module comprises a plurality of support tubes with different cross-sectional sizes, which are sequentially sleeved on the outside of the simulated lining according to the cross-sectional sizes from small to large, and the two ends of which are respectively connected to the top wall and the bottom wall of the test box; the adjacent support tubes are tightly fitted and connected by a snap-fit; each support tube is assembled from a plurality of standard arc plates; The device also includes: The force applying module is arranged on the outer wall surface of the supporting module and is used for applying radial supporting force to the supporting module.

2. The test device for simulating the cracking process of surrounding rock lining combined structure according to claim 1 is characterized in that: The force-applying module includes a plurality of force-transmitting members, which are distributed around the outer wall surface of the supporting module and are used to apply radial supporting force to the supporting module.

3. The test device for simulating the cracking process of surrounding rock lining combined structure according to claim 1 is characterized in that: The outermost support tube is a watertight rigid structure; the remaining support tubes are watertight rigid structures.

4. The test device for simulating the cracking process of surrounding rock lining combined structure according to claim 1 is characterized in that: A water collecting box is arranged on the bottom wall of the test box, and the water collecting box is connected with the interior of the support module through a water collecting pipe; a pressurizing device is arranged on the water collecting pipe; and a flow monitoring device is arranged on the water collecting box.

5. The test device for simulating the cracking process of surrounding rock lining combined structure according to claim 4 is characterized in that: A first gravity sensor is provided in the inner area of ​​the simulated lining; a second gravity sensor is provided on the bottom wall of the test box at a position corresponding to the support module; and a third gravity sensor is provided at the bottom of the water collecting tank.

6. A test method for simulating the cracking process of a surrounding rock lining combined structure based on the test device for simulating the cracking process of a surrounding rock lining combined structure according to any one of claims 1 to 5, characterized in that: include: S1. Control the water supply module to inject test water into the sample module; S2. Turn on the sensing module to sense the magnetic particles flowing out of the gaps simulating the cracks in the lining, and obtain the gravity values ​​sensed by the second gravity sensor and the third gravity sensor.

Images