Coastal karst structure disaster-causing and treatment stability simulation test device and test method

Abstract

The invention relates to the technical field of karst geological disaster prevention and control, and provides a coastal karst structure disaster-causing and treatment stability simulation test device and method, the device comprises a tidal water tank, a rock-soil simulation box body, a karst structure module and a grouting module, the rock-soil simulation box body is arranged on one side of the tidal water tank, and a seepage hole is formed between the rock-soil simulation box body and the tidal water tank; one end of the karst structure module is connected with the tide water tank, and the other end is connected with the rock-soil simulation box body or the grouting module; the tide water tank is used for injecting seawater and can adjust the water level, the water pressure and the water temperature; the rock-soil simulation box body is used for laying a rock-soil body; the karst structure module comprises different types of structure combinations, and can realize mutual combination between a multi-aperture pipeline and a multi-aperture fracture and simulation of fractures with different dip angles; and the grouting module is used for pumping different grouting materials to the rock-soil simulation box body or the karst structure module. The device has the advantages of multiple functions and simple operation.

Description

Technical Field

[0001] The present invention relates to the technical field of karst geological disaster prevention and control, and particularly to a simulation test device and test method for disaster-causing and governance stability of coastal karst structures. Background Technique

[0002] The statements in this part only provide background techniques related to the present invention and do not necessarily constitute prior art.

[0003] The coastal karst area is severely affected by tidal action, with intense groundwater activity. Karst water inrush shows the characteristics of "variable flow rate, large flow velocity, and strong erosion". Geological disasters occur more frequently and on a larger scale. Traditional grouting plugging techniques are difficult to apply to the tidal dynamic water environment, and the effect of strata grouting reinforcement in the tidal seepage environment is also unsatisfactory, and the long-term service performance is difficult to meet expectations.

[0004] Currently, relevant karst disaster-causing and governance test devices are difficult to guide the governance of coastal karst disasters. For example, the seawater tidal environment is not considered, and tidal fluctuations and wave splash erosion cannot be effectively characterized, resulting in the difficulty of clarifying the slurry diffusion law in the tidal environment; the karst structure types do not conform to the actual situation, and often only pipes or flat fissures are used for simulation, and the combined research of multiple types of structures cannot be carried out, resulting in the unclear occurrence mechanism of geological disasters under the influence of complex karst structures; in terms of grouting reinforcement and durability, the environmental water tank often relies on its own static head pressure and cannot achieve lateral different water pressure replenishment, resulting in the difficulty of effectively simulating the grouting reinforcement process under the influence of tidal seepage, and the influence of water pressure during service at different depths is not considered, and the influence of overlying load is ignored, resulting in the lack of durability evaluation factors. Summary of the Invention

[0005] In order to solve the deficiencies of the prior art, the present invention provides a simulation test device and test method for disaster-causing and governance stability of coastal karst structures, which can realize the full-process simulation of dynamic water grouting plugging of complex karst structures in the tidal environment, the simulation of the disaster-causing process of karst structures, the grouting reinforcement of rock and soil bodies, and the long-term stability simulation of governance effects, guiding the prevention and control of coastal karst disasters, and having the advantages of diverse functions and simple operation.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The first aspect of the present invention provides a simulation test device for disaster-causing and governance stability of coastal karst structures.

[0007] A simulation test device for disaster-causing and governance stability of coastal karst structures includes a tidal water tank, a rock and soil simulation box body, a karst structure module, and a grouting module. The rock and soil simulation box body is arranged on one side of the tidal water tank, and there are seepage holes between the two; one end of the karst structure module is used to connect the tidal water tank, and the other end is used to connect the rock and soil simulation box body or the grouting module; The tidal water tank is used to inject seawater and can adjust the water level, water pressure and water temperature; The geotechnical simulation box is used to lay geotechnical materials; The karst structure module includes different types of structure combinations, which can realize the combination of multi-aperture pipelines and multi-opening fissures and the simulation of fissures with different dip angles; The grouting module is used to pump different grouting materials into the geotechnical simulation box or the karst structure module.

[0008] Furthermore, it also includes a wave-making board; The wave-making board is detachably arranged in the tidal water tank.

[0009] Furthermore, it also includes a multi-dimensional loading module; The multi-dimensional loading module includes a loading frame, a movable truss and a loading head. The movable truss moves left and right through the slide rail on the loading frame, and the loading head moves back and forth on the movable truss, so as to apply overlying loads with different positions and different magnitudes to the geotechnical materials in the geotechnical simulation box.

[0010] Furthermore, the grouting module includes a slurry bucket, an air tank and an air compressor connected in sequence.

[0011] Furthermore, the bottom side plate of the tidal water tank and the bottom plate of the geotechnical simulation box are both detachable to adapt to the connection of different types of structures.

[0012] Furthermore, the geotechnical simulation box is provided with seepage holes on the side away from the tidal water tank.

[0013] The second aspect of the present invention provides a test method based on a simulation test device for the disaster-causing and treatment stability of a coastal karst structure.

[0014] The test method based on the simulation test device for the disaster-causing and treatment stability of a coastal karst structure described in the first aspect includes the following steps: Connect the karst structure module to the tidal water tank, and connect the grouting module and the karst structure module; inject seawater into the tidal water tank and seal it, and adjust the water level, water pressure and water temperature; start the grouting module, and pump the slurry into the karst structure module to realize the full-process simulation of dynamic water grouting plugging of complex karst structures in a tidal environment.

[0015] Furthermore, it also includes: Connect the karst structure module to the tidal water tank and the geotechnical simulation box, and lay geotechnical materials in the geotechnical simulation box; place the wave-making board in the tidal water tank and inject seawater, and adjust the wave height and frequency; seawater under different hydraulic conditions will contact the geotechnical materials in the karst structure module and the geotechnical simulation box, and the dynamic water migration will hollow out the geotechnical materials, thereby causing the settlement and deformation of the geotechnical materials, and realizing the simulation of the disaster-causing process of the coastal karst structure.

[0016] Further, it also includes: Connect the karst structure module to the tidal water tank and the geotechnical simulation box body. Lay the geotechnical body in the geotechnical simulation box body and connect the grouting module and the geotechnical simulation box body. Inject seawater into the tidal water tank and seal it, and adjust the water pressure and water temperature. Start the grouting module, pump the slurry into the geotechnical body. As the slurry is injected, the stability of the geotechnical body is enhanced, and the ability to resist seawater seepage and hydrodynamic erosion of the structure is improved, realizing the simulation of grouting reinforcement of coastal karst structures.

[0017] Further, it also includes: After the simulation of grouting reinforcement of the coastal karst structure is completed, maintain the seepage water pressure and water temperature in the tidal water tank, and start the multi-dimensional loading module to apply overlying loads of different positions and different magnitudes to the grouted and reinforced geotechnical body, realizing the simulation of the stability of the grouting reinforcement effect of the coastal karst structure.

[0018] Compared with the prior art, the beneficial effects of the present invention are: The simulation test device for the disaster-causing and treatment stability of coastal karst structures according to the present invention can truly simulate different tidal environments (such as scouring, fluctuation frequency and height, etc.) through the tidal water tank, and simulate the actual development of karst structures through different types of structure combinations in the karst structure module. It can realize the true restoration of different tidal environments and karst structures, and can simultaneously realize the whole-process simulation of dynamic water grouting plugging of complex karst structures under tidal environments and the simulation of grouting reinforcement of geotechnical bodies.

[0019] The simulation test device for the disaster-causing and treatment stability of coastal karst structures according to the present invention can apply forces of different positions and different magnitudes through the multi-dimensional loading module, truly simulate the external loads in the service environment, such as applying building loads (static loads) or vehicle loads (dynamic loads). The stress environment is more real, and it can realize the long-term stability simulation of the treatment effect, guiding the prevention and control of coastal karst disasters.

[0020] The simulation test device for the disaster-causing and treatment stability of coastal karst structures according to the present invention can freely adjust the wave-making position through the wave-making board, set the wave-making time and frequency, realize the true simulation of different tidal environments, and can realize the simulation of the disaster-causing process of karst structures.

[0021] The simulation test device for the disaster-causing and treatment stability of coastal karst structures according to the present invention can realize the whole-process simulation of dynamic water grouting plugging of complex karst structures under tidal environments, the simulation of the disaster-causing process of karst structures, the grouting reinforcement of geotechnical bodies and the long-term stability simulation of the treatment effect, guiding the prevention and control of coastal karst disasters, and has the advantages of diverse functions and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The attached drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0023] Figure 1 It is a structural diagram of the simulation test device for disaster-causing and governance stability of coastal karst structures provided by the present invention; Figure 2 It is a schematic diagram of a pipe-type karst structure module provided by the present invention; Figure 3 It is a schematic diagram of a fissure-type karst structure module provided by the present invention; Figure 4 It is a schematic diagram of a pipe-fissure combined karst structure module provided by the present invention; Figure 5 It is a structural diagram of a wave-making board provided by the present invention. Detailed implementation manners

[0024] The present invention will be further described below in conjunction with the attached drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are all exemplary and are intended to provide a further description of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0026] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached drawings. They are only relationship terms determined for the convenience of describing the structural relationship of each component or element of the present invention and do not specifically refer to any component or element in the present invention and should not be construed as a limitation of the present invention.

[0028] In the present invention, terms such as "fixed connection", "connected", "connected" should be understood in a broad sense, indicating that it can be a fixed connection, an integral connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium. For those related scientific research or technical personnel in the field, the specific meanings of the above terms in the present invention can be determined according to specific circumstances and should not be construed as a limitation of the present invention.

[0029] Without conflict, the embodiments and features in the embodiments of the present invention may be combined with each other.

[0030] Embodiment 1 Embodiment 1 of the present invention provides a simulation test device for disaster-causing and treatment stability of coastal karst structures.

[0031] The simulation test device for disaster-causing and treatment stability of coastal karst structures provided in this embodiment can realize the whole-process simulation of dynamic water grouting plugging of complex karst structures under tidal environment, the simulation of the disaster-causing process of karst structures, the grouting reinforcement of rock and soil bodies, and the long-term stability simulation of treatment effects, so as to guide the prevention and control of coastal karst disasters.

[0032] The simulation test device for disaster-causing and treatment stability of coastal karst structures provided in this embodiment, as Figure 1 shown, includes a tidal water tank 1, a rock and soil simulation box body 6, a multi-dimensional loading module, a karst structure module 4, and a grouting module.

[0033] Among them, as Figure 5 shown, a wave-making board 14 can be arranged in the tidal water tank 1, and the wave-making position can be freely adjusted, and the wave-making time and frequency can be set. Among them, the wave-making board 14 is inclined in the tidal water tank 1, with the left side higher and the right side lower. The change of the wave-making position can be realized by increasing or decreasing the length of the wave-making board 14 and the water level in the tidal water tank 1. By controlling the angle, frequency, and duration of the gear rotating back and forth through the controller, the transmission shaft is driven. The transmission shaft is connected to the wave-making board 14 through bolts, so as to realize the control of the wave-making time and frequency of the wave-making board 14.

[0034] As an implementation manner, the wave-making board 14 is detachable. Among them, by removing the bolts, the separation of the wave-making board from the transmission shaft can be realized, and then the transmission shaft and the gear of the controller are also detachable.

[0035] In this embodiment, the water temperature in the tidal water tank 1 can be adjusted from 0 to 60 °C, and the water level can be adjusted from 0 to 3 m. The tidal water tank 1 is internally equipped with a heating rod, which can be heated and insulated according to the preset temperature; the water level is controlled by a water level sensor in the tidal water tank 1 to automatically supplement and discharge water to control the water level.

[0036] In this embodiment, after the wave-making board 14 is removed, the tidal water tank 1 can be sealed and pressurized, and the water pressure can be controlled within 0 to 2 MPa. Because when making waves, the upper part of the tidal water tank 1 is not covered and sealed, that is, an open environment; when not studying the tidal scouring environment but instead studying the influence of water pressure, the tidal water tank 1 is first filled with seawater, and then the upper cover is tightly sealed with bolts, and an external air compressor is turned on to achieve different water pressures to simulate different water pressure environments.

[0037] In this embodiment, the bottom side plate 3 of the tidal tank is detachable (the detachable connection is achieved through bolts), which is applicable to the connection of different karst structure modules 4.

[0038] Among them, the geotechnical simulation box 6 is arranged at the upper part of one side of the tidal tank 1, and seepage holes 2 are arranged on the side plate where the two are connected. The geotechnical simulation box 6 is connected to the tidal tank 1 through the seepage holes 2. The geotechnical simulation box 6 can lay relevant rock and soil masses according to the actual environment, and seepage holes 2 are also arranged on the other side of the geotechnical simulation box 6 (the side far from the tidal tank) to achieve a stable seepage environment.

[0039] In this embodiment, the bottom plate 5 of the geotechnical simulation box is detachable (the detachable connection is achieved through bolts) to adapt to the connection of different karst structure modules 4. Since the bottom plate 5 of the geotechnical simulation box has connection ports with different shapes to meet the connection requirements of different karst structures, the bottom plate 5 is designed to be detachable to meet the experimental needs.

[0040] Among them, the multi-dimensional loading module includes a loading frame 9, a movable truss 8 and a loading head 7. The loading frame 9 includes two U-shaped frames, which are symmetrically arranged on both sides of the geotechnical simulation box 6. The movable truss 8 is horizontally arranged above the two U-shaped frames, and the loading head 7 is slidably arranged on the movable truss 8 so that the loading head is located above the geotechnical simulation box 6. The movable truss 8 moves left and right through the slide rails on the loading frame 9, and the loading head 7 moves back and forth on the movable truss 8, so as to apply overlying loads with different positions and sizes to the rock and soil masses in the geotechnical simulation box, preset the load application path, and realize the application of multi-condition loads. It can not only simulate static loads such as buildings, but also realize cyclic dynamic loads and simulate the process of vehicle loads.

[0041] Among them, through holes are provided on both the bottom plate 5 of the geotechnical simulation box and the bottom side plate 3 of the tidal tank for connecting the karst structure module 4. The karst structure module 4 includes different types of structure combinations, such as Figure 2 and Figure 3 As shown, it can realize the mutual combination of multi-aperture pipes and multi-aperture fissures, and can also realize the combination simulation of fissures with different inclinations and pipes.

[0042] Specifically, the karst structure module 4 has three types of structures: 1. Pipe-type karst structure, which can be connected with different pipe diameters through flanges to simulate karst pipe-type structures and realize the simulation of the disaster-causing and treatment processes of coastal karst structures, such as Figure 2As shown in the figure, the pipe-type karst structure module 4 includes pipes with different diameters: it can be composed of several pipes with diameters decreasing in order from large to small. The pipe with the largest diameter is connected to the through-hole of the bottom side plate 3 of the tidal water tank to communicate with the tidal water tank 1. Each pipe with a certain diameter is also connected to the through-hole of the bottom plate 5 of the geotechnical simulation box to communicate with the inside of the geotechnical simulation box 6. One end of the pipe with the smallest diameter is the discharge port and is not connected to other components; it can be composed of several pipes with diameters decreasing in order and arranged in parallel. One end of each pipe with a certain diameter is connected to the through-hole of the bottom side plate 3 of the tidal water tank to communicate with the tidal water tank 1. The other end of each pipe with a certain diameter is the discharge port and is not connected to other components. Multiple connection ports are opened in the middle of each pipe with a certain diameter, and each connection port is connected to the through-hole of the bottom plate 5 of the geotechnical simulation box to communicate with the inside of the geotechnical simulation box 6; it can be a tree-like structure composed of several pipes with different diameters. One end of the main pipe is connected to the through-hole of the bottom side plate 3 of the tidal water tank to communicate with the tidal water tank 1. The other ends of the main pipe and each branch pipe are discharge ports and are not connected to other components. Multiple connection ports are opened in the middle of the main pipe and each branch pipe, and each connection port is connected to the through-hole of the bottom plate 5 of the geotechnical simulation box to communicate with the inside of the geotechnical simulation box 6; 2. Fissure-type karst structure, which can simulate different fissure areas, apertures, etc., such as Figure 3 As shown in the figure, the fissure-type karst structure module 4 includes several small flat plates, which are hermetically connected by flanges between the small flat plates. According to the experimental requirements, different numbers of small flat plates are assembled to form a large flat plate fissure with the final size; the same as the pipe-type karst structure module 4, one end is connected to the tidal water tank 1, and the other end is the discharge port and is not connected to other components; and scale lines are provided on each small flat plate to observe the process of slurry diffusion; according to the experimental requirements, connection ports with different shapes, sizes and numbers can be opened on the flat plate fissure, and this connection port can be connected to the through-hole of the bottom plate 5 of the geotechnical simulation box to communicate with the inside of the geotechnical simulation box 6; 3. Fissure-pipe type karst structure, where fissures with different diameters and apertures are connected at different angles to simulate the situation of complex structural combinations, such as Figure 4As shown in the figure; pipes with different diameters and large flat plates with cracks of different openings are connected at different angles. Openings need to be made at the connection points between the pipes and the flat plate cracks. Since the material is acrylic board, the pipes and the large flat plate with cracks are connected by hot melting. Because the flat plate crack is formed by combining two plates, by adjusting the opening between the plates, the internal space also changes accordingly. At this time, a through space is formed between the pipe and the flat plate crack. The front, back, and bottom sides of the flat plate crack are sealed, while the upper side is in a normal open form and can be connected to the through hole of the bottom plate 5 of the geotechnical simulation box to achieve internal connection with the geotechnical simulation box 6; according to the test requirements, different combination forms are made; similar to the pipe-type karst structure module 4, one end is connected to the tidal water tank 1, and the other end is the discharge port, not connected to other components.

[0043] Among them, the grouting module includes a slurry bucket 10, an air tank 11, and an air compressor 12 connected in sequence. The combined grouting pipe 13 can realize the pumping of different grouting materials. The inlet of the grouting pipe 13 is connected to the slurry bucket 10, and the outlet is arranged inside the geotechnical simulation box 6 or connected to the karst structure module 4.

[0044] A simulation test device for the disaster-causing and governance stability of coastal karst structures provided by this embodiment. The tidal water tank can realize the adjustment of different water pressures, water temperatures, and water levels, and can also freely adjust the wave-making position through the wave-making board, set the wave-making time and frequency, and realize the true simulation of different tidal environments.

[0045] A simulation test device for the disaster-causing and governance stability of coastal karst structures provided by this embodiment. The karst structure module can realize the mutual combination between pipes with multiple apertures and cracks with multiple openings, and can also realize the simulation of cracks with different inclination angles, conforming to the actual development situation of karst structures.

[0046] A simulation test device for the disaster-causing and governance stability of coastal karst structures provided by this embodiment. The multi-dimensional loading module can apply forces of different positions and sizes to truly simulate the external loads in the service environment.

[0047] A simulation test device for the disaster-causing and governance stability of coastal karst structures provided by this embodiment can truly restore different tidal environments, karst structures, and external loads. It can realize the whole-process simulation of dynamic water grouting and plugging of complex karst structures under tidal environments, the simulation of the disaster-causing process of karst structures, the grouting reinforcement of geotechnical bodies, and the long-term stability simulation of governance effects, guiding the prevention and control of coastal karst disasters, and having the advantages of diverse functions and simple operation.

[0048] Embodiment 2 This embodiment provides a test method based on the simulation test device for the disaster-causing and governance stability of coastal karst structures described in Embodiment 1, including the following steps: Step 1, simulation of the entire process of dynamic water grouting and plugging of complex karst structures under tidal environment: connect the karst structure module 4 to the bottom side plate 3 of the tidal water tank, and connect the grouting pipe 13 to the karst structure module 4 through the geotechnical simulation box 6, at this time the grouting pipe 13 is in a closed state; then inject seawater into the tidal water tank 1 and seal it, adjust the water level, water pressure, and water temperature, at this time the karst structure module 4 is in a tidal dynamic water environment; then open the grouting pipe 13, start the grouting module (slurry barrel 10, air tank 11, air compressor 12), and the slurry will be pumped into the karst structure module 4 through the grouting pipe 13, realizing the dynamic water grouting simulation of complex structures in tidal environment.

[0049] It should be noted that in step 1, due to experimental requirements, there is no need to lay rock and soil in the geotechnical simulation box, that is, there is space inside. At this time, the grouting pipe 13 is connected to the karst structure module 4 in this space; the karst structure module is connected to the bottom plate connection port of the geotechnical simulation box, and at this time the grouting pipe is also connected to this connection port, that is, the connection between the grouting pipe and the structure module is realized.

[0050] Step 2: Simulate the disaster-causing process of coastal karst structures: Connect the karst structure module 4 to the bottom side plate 3 of the tidal water tank and the bottom plate 5 of the geotechnical simulation box, and lay the geotechnical body in the geotechnical simulation box according to the actual working conditions; then place the wave-making board 14 in the tidal water tank 1 and inject seawater, and adjust the wave-making height and frequency; at this time, seawater under different hydraulic conditions will contact the geotechnical body in the geotechnical simulation box 6 through the karst structure module 4, and the dynamic water movement will hollow out the geotechnical body, thereby causing the geotechnical body to sink and deform, realizing the simulation of the disaster-causing process of coastal karst structures.

[0051] Step 3, coastal karst structure grouting reinforcement simulation: the karst structure module 4 is connected to the bottom side plate 3 of the tidal water tank and the bottom plate 5 of the geotechnical simulation box, and the geotechnical simulation box 6 is laid according to the actual working conditions. The grouting pipe 13 is pre-buried above the connection position between the karst structure module 4 and the geotechnical simulation box 6. At this time, the grouting pipe is in a closed state; then seawater is injected into the tidal water tank 1 and the water pressure and water temperature are adjusted. At this time, the karst structure module 4 is in a tidal dynamic water environment and the geotechnical simulation box is in a tidal seepage environment; then, the grouting pipe 13 is opened, and the grouting module (slurry barrel 10, air tank 11, air compressor 12) is started. The slurry will be pumped into the geotechnical simulation box through the grouting pipe 13. As the slurry is injected, the stability of the geotechnical simulation box is enhanced, and the ability to resist seawater seepage and structural dynamic water erosion is improved, thereby realizing the coastal karst structure grouting reinforcement simulation.

[0052] It should be noted that the embedded position, depth and distance of the grouting pipe 13 need to be designed according to the experimental requirements. This involves the influence of different grouting technical schemes on the grouting reinforcement effect. The influence of different grouting layers, the relationship between grouting position and structural position and other factors on the grouting reinforcement effect can be studied.

[0053] In addition, the grouting outlet of the grouting pipe 13 faces downward.

[0054] Step 4: Simulation of the stability of the grouting reinforcement effect for the coastal karst structure: After the grouting reinforcement in Step 3 is completed, continue to maintain the seepage water pressure and water temperature in the tidal water tank 1, and start the multi-dimensional loading module (loading frame 9, movable truss 8, loading head 7) to apply overburden loads of different positions and different magnitudes to the grouted and reinforced rock and soil mass, simulate the action of external forces such as building and traffic loads, and realize the simulation of the stability of the grouting reinforcement effect under the combined action of the water environment and external loads.

[0055] In the above steps, the karst structure module is not limited to a certain specific pipeline, crack or pipeline-crack. Instead, according to the experimental requirements, such as studying the disaster-causing or treatment process of pipeline-type structures, the structure is replaced with a pipeline. The reason for dividing the karst structure module into several types is due to the types of structures in the karst area.

[0056] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A simulation test device for disaster-causing and governance stability of coastal karst structures, characterized in that: It includes a tidal water tank, a geotechnical simulation box, a karst structure module and a grouting module. The geotechnical simulation box is arranged on one side of the tidal water tank, and there are seepage holes between them. One end of the karst structure module is used to connect to the tidal water tank, and the other end is used to connect to the geotechnical simulation box or the grouting module. The tidal water tank is used to inject seawater and can adjust the water level, water pressure and water temperature. The geotechnical simulation box is used to lay geotechnical materials. The karst structure module contains different types of structure combinations, and can realize the mutual combination between multi-aperture pipelines and multi-opening fissures and the simulation of fissures with different dip angles. The grouting module is used to pump different grouting materials into the geotechnical simulation box or the karst structure module.

2. The simulation test device for disaster-causing and governance stability of coastal karst structures according to claim 1, wherein: It also includes a wave-making board. The wave-making board is detachably arranged in the tidal water tank.

3. The simulation test device for disaster causing and governance stability of coastal karst structures according to claim 1, characterized in that: It also includes a multi-dimensional loading module. The multi-dimensional loading module includes a loading frame, a movable truss and a loading head. The movable truss moves left and right through the slide rails on the loading frame, and the loading head moves back and forth on the movable truss, so as to apply overlying loads with different positions and different magnitudes to the geotechnical materials in the geotechnical simulation box.

4. A simulation test device for disaster-causing and governance stability of coastal karst structures according to claim 1, characterized in that: The grouting module includes a slurry bucket, an air tank and an air compressor connected in sequence.

5. The simulation test device for disaster-causing and governance stability of coastal karst structures according to claim 1, characterized in that: The bottom side plates of the tidal water tank and the bottom plate of the geotechnical simulation box are both detachable to adapt to the connection of different types of structures.

6. The simulation test device for disaster-causing and governance stability of coastal karst structures according to claim 1, characterized in that: The geotechnical simulation box is provided with seepage holes on the side far from the tidal water tank.

7. The test method of a simulation test device for disaster-causing and governance stability of coastal karst structures according to any one of claims 1-6, characterized in that: It includes the following steps: Connect the karst structure module to the tidal water tank, and connect the grouting module and the karst structure module; inject seawater into the tidal water tank and seal it, and adjust the water level, water pressure and water temperature. Start the grouting module, pump the slurry into the karst structure module, and realize the full-process simulation of dynamic water grouting plugging of complex karst structures in a tidal environment.

8. A test method according to claim 7, characterized in that: It also includes: Connect the karst structure module to the tidal water tank and the geotechnical simulation box, and lay geotechnical materials in the geotechnical simulation box. Place the wave-making board in the tidal water tank and inject seawater, and adjust the wave height and frequency; seawater under different hydraulic conditions will contact the geotechnical materials in the karst structure module and the geotechnical simulation box, and the dynamic water migration will hollow out the geotechnical materials, thereby causing the settlement and deformation of the geotechnical materials, and realizing the simulation of the disaster-causing process of coastal karst structures.

9. A test method according to claim 7, characterized in that: It also includes: Connect the karst structure module to the tidal water tank and the geotechnical simulation box, lay geotechnical materials in the geotechnical simulation box, and connect the grouting module and the geotechnical simulation box; inject seawater into the tidal water tank and seal it, and adjust the water pressure and water temperature; start the grouting module, pump the slurry into the geotechnical materials, and as the slurry is injected, the stability of the geotechnical materials is enhanced, and the ability to resist seawater seepage and dynamic water erosion of the structure is improved, realizing the simulation of coastal karst structure grouting reinforcement.

10. A test method according to claim 7, characterized in that: It also includes: After the simulation of coastal karst structure grouting reinforcement is completed, maintain the seepage water pressure and water temperature in the tidal water tank, and start the multi-dimensional loading module to apply overlying loads with different positions and different magnitudes to the grouted and reinforced geotechnical materials, realizing the simulation of the stability of the coastal karst structure grouting reinforcement effect.

Images