A test device for simulating the erosion process of a base material void

Abstract

The application discloses a kind of test devices simulating base material void body erosion process, including main test box, test piece body and camera, the front side end of the main test box is fixed with the visual panel of organic glass material, the middle part of the visual panel is fixed with water-aggregate loss pipe, the end of water-aggregate loss pipe away from the position of main test box is fixed with hydraulic supply pipe, the top of the hydraulic supply pipe is fixed with water supply pipe for conveying water source, and the end of the main test box is provided with water outlet for discharging seepage water.The application provides a kind of intuitive, controllable, easy-to-operate test equipment for studying the water-base material coupling scouring erosion effect of airport pavement or urban pavement slab bottom void area, which is conducive to improving the test research level of pavement base material deterioration regional state evolution, thereby providing a theoretical basis for pavement slab bottom void early warning and prevention.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road engineering test, in particular to a test device for simulating the erosion process of base material void. BACKGROUND

[0002] With the continuous improvement of people's living standards, the number of cars in China is rising, and the demand for air travel is also growing. The highway, airport and other transportation infrastructure are facing great traffic pressure.

[0003] Cement concrete has the characteristics of large pavement stiffness and high temperature resistance. Many airports in China use it as a construction material for pavement panels, with a design life of 30 years. However, many airports were built a long time ago, and the construction standards and specifications used at that time cannot meet the needs of today's large traffic volume. With the advent of heavy aircraft such as Boeing 747 and Airbus A380, the stress on the pavement is constantly approaching the design bending stress, and the remaining life of the pavement slab is often shortened. It manifests itself in a variety of structural diseases that cannot be repaired, such as pavement cracking, corner cracking, pavement misalignment, and runway potholes, etc. The main cause of the above diseases is the coupling of water and base material, which leads to slab bottom void disease.

[0004] At present, due to the widespread attention to pavement structural diseases, airport pavement maintenance personnel mostly focus on the repair process after the disease occurs, and fail to accurately predict and timely manage the development process. The fundamental reason is that the development process and nature evolution law of the disease have not been revealed in essence, and the control of pavement diseases is mostly based on engineering experience, lacking scientific indicators for quantitative description. At present, there is a lack of corresponding test equipment for systematic research and testing of the development law of pavement slab bottom void.

[0005] In the field of road engineering design in China, various test equipment for water-base material coupling has been developed, which can study the erosion resistance of base material under different influencing factors. The representative devices are divided into two categories: pump suction type erosion test device based on MTS platform and dynamic water erosion type test device that directly applies high pressure water flow to the surface of the test piece.

[0006] However, the above test devices focus on the erosion resistance of the test piece, and there is no specific test device to study the nature evolution law of the internal void of the base material under the repeated erosion and erosion of water flow. The nature development process and quantitative description method have not been revealed.

[0007] The existing two types of test devices have the following obvious shortcomings:

[0008] First, the MTS platform has the disadvantages of high cost, large scale of instrument, easy to be damaged, etc., and the scouring head of the test device manufactured based on the platform often directly acts on the surface of the test piece, which is easy to cause impact damage to the test piece and cause large test error;

[0009] Second, the dynamic water scouring type test device can accurately control the dynamic water pressure acting on the surface of the test piece, but it does not consider the pumping effect in the void under the actual traffic load, and it is difficult to simulate the evolution process of the void under the actual pavement slab. Although pavement structure diseases occur frequently, a series of detection methods are proposed for pavement slab void, and various devices for pavement base material scouring test are also developed, but the existing test devices cannot simulate the evolution process of the void under the water-base material coupling of the pavement slab, and the evaluation method for quantitative prediction still needs further research.

[0010] Therefore, it is urgent to develop a test device that can simulate the evolution process of the void of the base material, and to carry out systematic research on the void disease problem caused by the water-base material coupling of the slab. SUMMARY

[0011] The purpose of the present application is to provide a test device for simulating the erosion process of the void of the base material, so as to solve the problem that the evolution process of the void under the water-base material coupling of the pavement slab cannot be simulated.

[0012] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a main test box, a test piece body and a camera, the front side of the main test box is fixedly provided with a visual panel made of organic glass, the middle part of the visual panel is fixedly provided with a water-collector loss pipe, the end of the water-collector loss pipe away from the main test box is fixedly provided with a water supply pipe, the top of the water supply pipe is fixedly provided with a water supply pipe for conveying water source, and one end of the main test box is provided with a water outlet for discharging seepage water.

[0013] The rear side of the main test box is movably provided with a back fixed pillar, and the back fixed pillar movably penetrates and extends into the interior of the main test box, one end of the back fixed pillar corresponding to the position in the interior of the main test box is closely attached with a test piece restraining baffle, so that the test piece restraining baffle closely attaches the test piece body to the surface of the visual panel.

[0014] The top of the main test box is movably connected with a detachable cover plate, so that the test piece body and the parts inside the main test box are convenient to take and place, the middle of the detachable cover plate is fixedly provided with a piston sleeve, the inner wall of the piston sleeve is movably connected with a piston, the top of the piston is fixedly connected with a piston rod, and the piston rod movably penetrates and extends to the top of the piston sleeve, the top of the piston rod is fixedly provided with a cylinder, the bottom of the piston sleeve is fixedly connected with a waterproof cover plate, and the waterproof cover plate is closely attached to the top of the test piece body, the inside of the test piece body is provided with a hollow body, the front side of the waterproof cover plate is provided with a water flow channel for communicating the inside of the piston sleeve and the hollow body, and the inside of the water aggregate loss pipe is communicated with the inside of the hollow body, the top of the main test box is fixedly provided with a controller, a first air guide pipe is fixedly connected between the air inlet end of the cylinder and the output end of the controller, the input end of the controller is fixedly connected with a second air guide pipe, and the end of the second air guide pipe away from the controller is fixedly connected with an air compressor for providing air pressure.

[0015] Preferably, the main test box is an open-top box structure, and the main test box is a component of organic glass material, the middle of the visible panel and the side wall of the hollow body are respectively provided with sensor reserved holes for laying dynamic water pressure sensor leads.

[0016] Preferably, the middle of the visible panel is provided with a aggregate loss hole for providing a position for the water aggregate loss pipe installed in the middle of the visible panel, and the aggregate loss hole is a circular structure, both ends of the water aggregate loss pipe are provided with threads, so that both ends of the water aggregate loss pipe are respectively threadedly connected with the input end of the main test box and the output end of the water supply pipe.

[0017] Preferably, the water supply pipe is fixedly installed at the front side of the visible panel through a screw rod, the bottom of the water supply pipe is threadedly connected with a aggregate guide cover, and the top of the water supply pipe is threadedly connected with a detachable cylindrical top cover, the water supply pipe fixedly penetrates and extends to both ends of the detachable cylindrical top cover, and the end of the water supply pipe away from the water supply pipe is fixedly connected with an external water source.

[0018] Preferably, the main test box is provided with a first circular hole at one end of the corresponding back fixed support position, which provides a position for the back fixed support to be installed on the back of the main test box, the surface of the back fixed support is threadedly connected with a nut, and the nut is fixedly connected to the rear side of the main test box, so that the nut cooperates with the first circular hole to fix the back fixed support on the rear side of the main test box.

[0019] Preferably, the middle of the detachable cover plate is provided with a square hole, so as to provide an installation space for the piston sleeve to be installed in the middle of the detachable cover plate, and the piston sleeve is fixedly connected to the inner wall of the square hole.

[0020] Preferably, the top of the piston sleeve is fixedly connected with fixed columns, the number of the fixed columns is four, and the four fixed columns are fixedly connected with the bottom of the cylinder, the bottom of the cylinder output shaft is fixedly connected with a driving rod, and the piston rod is screwedly connected with the bottom of the driving rod.

[0021] Preferably, the top of the detachable cover plate is fixedly connected with a fixed cover plate, rubber gaskets are fixedly connected with the opposite end positions of the four corners of the detachable cover plate and the fixed cover plate, the controller is fixedly connected with the top of the fixed cover plate, the two ends of the fixed cover plate are respectively provided with second circular hole positions, test box fixed support rods are movably inserted into the inner walls of the second circular hole positions, and test device bases are screwedly connected with the bottom of the test box fixed support rods.

[0022] Compared with the prior art, the test device has the following beneficial effects:

[0023] 1. The air compressor is used for applying air pressure to control the up-down reciprocating movement of the cylinder driving piston, and the water flow is used for continuously washing and eroding the preset void deterioration area of the test piece, so that the deterioration state evolution of the deterioration area caused by water damage of the base material can be studied. 2. The water supply pipe is connected with the main test box through the detachable aggregate loss pipe, the top cover is connected with the external water source through the water supply pipe, and the water supply pipe is used for providing water supply for the test. 3. The main test box body is provided with a visible panel, the state evolution process of the deterioration area of the base material under the dynamic water washing can be directly obtained through image processing. 4. The fixed cover plate is flexibly connected between the main test box and the test device fixed base, the fixed cover plate can be relatively fixed through nuts, the grounding area of the main test box is increased in a relatively simple mode, the stability of the main test box is improved, the main test box is prevented from being disorderedly vibrated or even tilted or a large test error is caused due to the application of external load during the test, the test device provides an intuitive, controllable and convenient test equipment for studying the water-base material coupling washing and erosion of the void area of the airport pavement or the urban pavement slab, and the test research level of the state evolution of the deterioration area of the pavement base material is improved, so that a theoretical basis is provided for the early warning and prevention of the void of the pavement slab. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a whole structure schematic view of the test device for simulating the erosion process of the void body of the base material.

[0025] Figure 2 It is a main test box structure partial front view of the test device for simulating the erosion process of the void body of the base material.

[0026] Figure 3It is a whole structure side view of the test device for simulating the erosion process of the base material void body according to the present application;

[0027] Figure 4 It is a whole structure plan view of the test device for simulating the erosion process of the base material void body according to the present application;

[0028] Figure 5 It is a whole structure back view of the test device for simulating the erosion process of the base material void body according to the present application;

[0029] Figure 6 It is a void body structure sectional view of the test device for simulating the erosion process of the base material void body according to the present application.

[0030] In the figure: 1, main test box; 2, visible panel; 3, sensor reserved hole; 4, aggregate loss hole; 5, water-aggregate loss pipe; 6, water supply pipe; 7, aggregate guide cover; 8, detachable cylindrical top cover; 9, water supply pipe; 10, external water source; 11, water outlet; 12, back fixing pillar; 13, first circular hole; 14, nut; 15, test piece restraining baffle; 16, detachable cover plate; 17, test piece body; 18, square hole; 19, piston sleeve; 20, waterproof cover plate; 21, piston; 22, void body; 23, piston rod; 24, air cylinder; 25, driving rod; 26, fixing column; 27, controller; 28, first air guide pipe; 29, second air guide pipe; 30, air compressor; 31, fixed cover plate; 32, rubber gasket; 33, second circular hole; 34, test box fixing pillar; 35, test device base; 36, test device fixing bolt; 37, camera. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] Please refer to Figures 1-6 The present application provides a technical solution: including main test box 1, test piece body 17 and camera 37, the front side end of main test box 1 is fixedly provided with visible panel 2 made of organic glass, the middle part of visible panel 2 is fixedly provided with water-aggregate loss pipe 5, the end of water-aggregate loss pipe 5 away from main test box 1 is fixedly provided with water supply pipe 6, the top of water supply pipe 6 is fixedly provided with water supply pipe 9 for conveying water source, one end of main test box 1 is provided with water outlet 11 for discharging seepage water, which can timely discharge the water seeping from the edge during the test process;

[0033] The rear side end of the main test box 1 is movably provided with a back fixing support 12, and the back fixing support 12 movably penetrates and extends to the inside of the main test box 1, and one end of the back fixing support 12 closely abuts with a test piece restraining baffle 15 corresponding to the position of the inside of the main test box 1, so that the test piece restraining baffle 15 closely abuts the test piece body 17 to the surface of the visual panel 2;

[0034] The top of the main test box 1 is movably connected with a detachable cover plate 16, so as to facilitate the taking and placing operation of the test piece body 17 and the parts inside the main test box 1, and the middle of the detachable cover plate 16 is fixedly provided with a piston sleeve 19, the inner wall of the piston sleeve 19 is movably connected with a piston 21, the top of the piston 21 is fixedly installed with a piston rod 23, and the piston rod 23 movably penetrates and extends to the top of the piston sleeve 19, the top of the piston rod 23 is fixedly provided with an air cylinder 24, the bottom of the piston sleeve 19 is fixedly installed with a waterproof cover plate 20, and the waterproof cover plate 20 closely abuts the top of the test piece body 17, the inside of the test piece body 17 is provided with a hollow body 22, the front side end of the waterproof cover plate 20 is provided with a water flow channel for communicating the inside of the piston sleeve 19 and the hollow body 22, and the inside of the water aggregate loss pipe 5 is communicated with the inside of the hollow body 22, so that the water flow is repeatedly flowed in the water power supply pipe 6 and the preset quarter spherical hollow body 22 of the test piece body 17 by the up and down traction of the piston 21, so as to achieve the purpose of repeatedly eroding the test piece, the top of the main test box 1 is fixedly provided with a controller 27, and the air inlet end of the air cylinder 24 and the output end of the controller 27 are fixedly installed with a first air guide pipe 28, the input end of the controller 27 is fixedly installed with a second air guide pipe 29, and one end of the second air guide pipe 29 away from the controller 27 is fixedly installed with an air compressor 30 for providing air pressure.

[0035] The main test box 1 is a top opening box structure, and the main test box 1 is an organic glass material component, the middle of the visual panel 2 and the side wall of the hollow body 22 are respectively provided with sensor reserved holes 3 for laying dynamic water pressure sensor lead wires, and the front view of the main test box 1 is the visual panel 2, so that the test personnel can record the whole process of the test by using image capture technology, and can make targeted theoretical analysis on the behavior evolution of the test piece.

[0036] The middle of the visual panel 2 is provided with an aggregate loss hole 4 for providing a position for installing the water aggregate loss pipe 5 in the middle of the visual panel 2, and the aggregate loss hole 4 is a circular structure, and the two ends of the water aggregate loss pipe 5 are provided with threads, so that the two ends of the water aggregate loss pipe 5 are respectively threadedly connected with the input end of the main test box 1 and the output end of the water power supply pipe 6.

[0037] The hydraulic supply pipe 6 is fixedly installed at the front side end of the visible panel 2 by a screw rod, the bottom of the hydraulic supply pipe 6 is threadedly connected with a aggregate guide-out cover 7 which can be detached from the hydraulic supply pipe 6 by rotating, and the top of the hydraulic supply pipe 6 is threadedly connected with a detachable cylindrical top cover 8, a water supply pipe 9 is fixedly penetrated and extends to the upper and lower ends of the detachable cylindrical top cover 8, and an external water source 10 is fixedly installed at the end of the water supply pipe 9 away from the hydraulic supply pipe 6 to continuously supplement water for the test process, and the hydraulic supply pipe 6 is stably connected with the visible panel 2 of the main test box 1 by a screw rod; the main body part is a hollow cylinder with open ends, the side hole is screw-connected with the water-aggregate loss pipe 5 for stable connection between the main test box 1; the lower aggregate guide-out cover 7 is flexibly installed on the hydraulic supply pipe 6 by rotating to timely take out the aggregate washed away from the test piece body 17 after the test is carried out and weigh the mass; the detachable cylindrical top cover 8 at the top of the hydraulic supply pipe 6 is flexibly installed and detached, the top is connected with the external water source through the water supply pipe to timely provide water supply for the test.

[0038] The main test box 1 is provided with a first circular hole position 13 at one end corresponding to the position of the back fixed support 12 to provide a position for installing the back fixed support 12 at the back of the main test box 1, the surface of the back fixed support 12 is threadedly connected with a nut 14, and the nut 14 is fixedly installed at the rear side end of the main test box 1 to fix the back fixed support 12 at the rear side end of the main test box 1 by cooperation of the nut 14 and the first circular hole position 13, the test piece restraining baffle 15, the back fixed support 12 and the main test box 1 are flexibly installed, and the back fixed support 12 is rigidly connected with the test piece restraining baffle 15, which can fix the test piece body 17 on the visible panel 2 of the main test box 1 by the nut 14 to keep the form of the test piece body 17 fixed.

[0039] The detachable cover plate 16 is provided with a square hole position 18 in the middle to provide an installation space for installing the middle part of the piston sleeve 19, and the piston sleeve 19 is fixedly installed on the inner wall of the square hole position 18.

[0040] The piston sleeve 19 is fixedly installed with four fixed columns 26 at the top, and the four fixed columns 26 are fixedly installed at the bottom of the air cylinder 24, the bottom of the output shaft of the air cylinder 24 is fixedly installed with a driving rod 25, and the piston rod 23 is threadedly connected at the bottom of the driving rod 25.

[0041] The top of the detachable cover plate 16 is fixedly provided with a fixed cover plate 31, and rubber pads 32 are fixedly arranged at the opposite ends of the faces of the detachable cover plate 16 and the fixed cover plate 31; the controller 27 is fixedly arranged on the top of the fixed cover plate 31; the two ends of the fixed cover plate 31 are respectively provided with second circular holes 33; the test box fixing column 34 is movably inserted into the inner wall of the second circular hole 33; the test device base 35 is threadedly connected to the bottom of the test box fixing column 34; the test device fixing bolt 36 is arranged on the top of the test device base 35 corresponding to the position of the main test box 1, so that the main test box 1 is fixedly arranged on the top of the test device base 35; the test device fixing bolt 36 stably connects the main test box 1 and the test device base 35; the connecting mode between the fixed cover plate 31, the main test box 1, the test box fixing column 34 and the test device base 35 is flexible, and the test device fixing bolt 36 can be freely removed and arranged; the test box fixing column 34 is screwedly arranged below the test device base 35; the four rubber pads 32 are bonded to the bottom of the fixed cover plate 31, so that the relative stability between the fixed cover plate 31 and the main test box 1 is maintained, and the abnormal sound generated by the vibration of the two after the test is started can be eliminated.

[0042] The erosion test of the cement stabilized gravel base layer by using the device is taken as an example to illustrate the use process of the test device for simulating the erosion process of the base layer material void 22, and the specific implementation method is as follows:

[0043] (1) The test equipment is cleaned to ensure that there is no foreign matter in the main test box 1, and is placed at the specified position on the test device base 35; the test box fixing column 34 is screw-fixed on the test device base 35; the test specimen restraining baffle 15 in the main test box 1 is moved to the edge of the main test box 1; the water-collector loss pipe is arranged on the water supply pipe and connected with the main test box 1; the dynamic water pressure sensor is pulled out from the sensor reserved hole of the visual panel 2 and inserted into the test area in advance, and is fixed on the visual panel 2;

[0044] (2) The test specimen body 17 is made according to the static pressure method, and the test specimen body 17 is a cube; the deterioration area is preset on the cube in advance according to the need to simulate the slab bottom void area of the pavement base layer in the actual situation;

[0045] (3) The test specimen is cured. The test object is mainly the cement stabilized base layer material, the curing period is 28 days, the temperature is controlled at 20±2℃, and the humidity is controlled at more than 90%;

[0046] (4) The cured test specimen is completely immersed in pure water for 24 hours to make it in a saturated state, so as to avoid the test error caused by water absorption during the test;

[0047] (5) After the test piece is saturated with water, wipe the water off the surface of the test piece with a dry cloth and weigh it;

[0048] (6) Place the test piece body 17 at a predetermined position of the main test box 1, fix the test piece restraining baffle 15 on the visual panel 2, tighten the nut 14 to make it relatively stable, cover the combination device of the piston sleeve 19 and the waterproof cover plate to the designated position;

[0049] (7) Cover the detachable cover plate 16 to the top of the main test box and cover the fixed cover plate 31 to the detachable cover plate 16, tighten the test device fixing bolt 36 on the test box fixing column 34 to make the whole relatively stable. Connect the air cylinder 24 with the piston rod 23 and fix it firmly on the piston sleeve 19.

[0050] (8) Turn on the power of the air compressor 30, set the required air pressure, connect the external water source to keep the test area saturated with water, start the test after setting the required number of reciprocating movements of the piston 21 through the controller 27, and record the changes of the dynamic water pressure through the dynamic water pressure sensor;

[0051] (9) When the test reaches the preset number of times, stop the test, take out the test piece, wipe it dry with a dry towel, and weigh it;

[0052] (10) The entire test process is recorded by the high-definition camera 37, and image processing is performed based on this in the later stage;

[0053] (11) Change the test loading times and the test loading air pressure, and repeat the above test process.

[0054] It should be noted that the relational terms such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0055] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An experimental device for simulating the erosion process of hollowed-out base materials, comprising a main test chamber (1), a specimen body (17), and a camera (37), characterized in that: The front end of the main test chamber (1) is fixed with a visible panel (2) made of plexiglass. A water-collecting material leakage pipe (5) is fixed in the middle of the visible panel (2). A water supply pipe (6) is fixed at one end of the water-collecting material leakage pipe (5) away from the main test chamber (1). A water supply pipe (9) for conveying water source is fixed at the top of the water supply pipe (6). An outlet (11) for draining leaked water is opened at one end of the main test chamber (1). The rear end of the main test chamber (1) is provided with a back fixing support (12), and the back fixing support (12) extends through and into the interior of the main test chamber (1). One end of the back fixing support (12) corresponding to the position inside the main test chamber (1) is tightly fitted with a specimen constraint baffle (15) so that the specimen constraint baffle (15) tightly fits the specimen body (17) against the surface of the visible panel (2). The top of the main test chamber (1) is movably connected to a detachable cover plate (16) to facilitate the handling of the specimen body (17) and the parts inside the main test chamber (1). A piston sleeve (19) is fixedly provided in the middle of the detachable cover plate (16). A piston (21) is movably connected to the inner wall of the piston sleeve (19). A piston rod (23) is fixedly connected to the top of the piston (21), and the piston rod (23) movably passes through and extends to the top of the piston sleeve (19). A cylinder (24) is fixedly provided at the top of the piston rod (23). A waterproof cover plate (20) is fixedly connected to the bottom of the piston sleeve (19), and the waterproof cover plate (20) is tightly fitted to the specimen body (17). At the top, the specimen body (17) has a hollow body (22) inside. The front end of the waterproof cover (20) has a water flow channel for connecting the piston sleeve (19) and the hollow body (22). The interior of the water-aggregate drain pipe (5) is connected to the interior of the hollow body (22). The top of the main test chamber (1) is fixedly equipped with a controller (27). The air inlet of the cylinder (24) is fixedly connected to the output of the controller (27) with a first air guide pipe (28). The input end of the controller (27) is fixedly connected with a second air guide pipe (29). The end of the second air guide pipe (29) away from the controller (27) is fixedly connected to an air compressor (30) for providing air pressure.

2. The experimental apparatus for simulating the erosion process of voided base materials according to claim 1, characterized in that: The main test chamber (1) is a box structure with an open top, and the main test chamber (1) is made of organic glass material. The middle part of the visible panel (2) and the side wall of the hollow body (22) are respectively provided with sensor reserved holes (3) for laying the leads of the dynamic water pressure sensor.

3. The experimental apparatus for simulating the erosion process of voided base materials according to claim 2, characterized in that: The center of the visible panel (2) is provided with a material discharge hole (4) for providing a position for the water-material discharge pipe (5) to be installed in the center of the visible panel (2), and the material discharge hole (4) is circular. Both ends of the water-material discharge pipe (5) are threaded so that the two ends of the water-material discharge pipe (5) are threaded to the input end of the main test chamber (1) and the output end of the hydraulic supply pipe (6) respectively.

4. The experimental apparatus for simulating the erosion process of voided base materials according to claim 3, characterized in that: The hydraulic supply pipe (6) is fixedly installed on the front end of the visible panel (2) by a screw. The bottom of the hydraulic supply pipe (6) is threaded with a material discharge cover (7), and the top of the hydraulic supply pipe (6) is threaded with a detachable cylindrical top cover (8). The water supply pipe (9) is fixedly inserted through and extends to the upper and lower ends of the detachable cylindrical top cover (8). The end of the water supply pipe (9) away from the hydraulic supply pipe (6) is fixedly connected to an external water source (10).

5. The experimental apparatus for simulating the erosion process of voided base materials according to claim 4, characterized in that: The main test chamber (1) has a first circular hole (13) at one end corresponding to the position of the back fixed support (12) for providing a position for the back fixed support (12) to be installed on the back of the main test chamber (1). The back fixed support (12) is threaded with a nut (14), and the nut (14) is fixedly connected to the rear end of the main test chamber (1) so that the nut (14) cooperates with the first circular hole (13) to fix the back fixed support (12) to the rear end of the main test chamber (1).

6. The experimental apparatus for simulating the erosion process of voided base materials according to claim 5, characterized in that: The removable cover plate (16) has a square hole (18) in the middle to provide installation space for the piston sleeve (19) to install the removable cover plate (16) in the middle. The piston sleeve (19) is fixedly connected to the inner wall of the square hole (18).

7. The experimental apparatus for simulating the erosion process of voided base materials according to claim 6, characterized in that: The top of the piston sleeve (19) is fixedly connected to a fixing post (26), and there are four fixing posts (26). All four fixing posts (26) are fixedly connected to the bottom of the cylinder (24). The bottom of the output shaft of the cylinder (24) is fixedly connected to a drive rod (25), and the piston rod (23) is threadedly connected to the bottom of the drive rod (25).

8. The experimental apparatus for simulating the erosion process of voided base materials according to claim 7, characterized in that: The top of the detachable cover plate (16) is fixedly connected to a fixed cover plate (31), and rubber gaskets (32) are fixedly connected to the four corners of the opposite side of the detachable cover plate (16) and the fixed cover plate (31). The controller (27) is fixedly connected to the top of the fixed cover plate (31). The two ends of the fixed cover plate (31) are respectively provided with second circular holes (33). The inner wall of the second circular holes (33) is movably inserted with a test chamber fixing support (34). The bottom of the test chamber fixing support (34) is threadedly connected to a test device base (35). The test device base (35) is provided with a test device fixing bolt (36) at the top of the position corresponding to the main test chamber (1) so as to fix the main test chamber (1) on the top of the test device base (35).

Images