A test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions

Abstract

The present invention discloses a test device for induced landslide by vibration liquefaction of compacted soil layer under long-term irrigation conditions, and relates to the technical field of landslide simulation test. The present invention comprises: an environmental simulation main box, a slope simulation system, and a compacted soil layer simulation system; the environmental simulation box comprises a model box, a slidable simulated irrigation water pipe, a sprinkler device on the top, an angle adjustment device controlled by a computer, an earthquake simulation device, and a refrigeration device arranged on the side. The present invention combines the slope model, the simulated preset sliding surface with the compacted soil layer simulation component, the irrigation factor, and the earthquake induction to achieve the simulation of the instability of the slope caused by the liquefaction of the compacted soil layer induced by low temperature, earthquake and other factors under long-term irrigation soil layer, and has a clear and intuitive analysis of the whole process of the landslide, so as to make the test results as objective and accurate as possible.

Description

Technical Field

[0001] The invention relates to the technical field of landslide simulation test, in particular to a test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions. Background Art

[0002] The related landslides that occur when compacting soil layers as retaining walls are an important engineering challenge facing my country's agricultural areas. Studying their sliding mechanisms and processes is an important prerequisite for ensuring the quality of cultivated land, ensuring the stability of projects in agricultural areas, and protecting the lives and property of farmers.

[0003] During long-term irrigation, landslides induced by the coupling of multiple factors such as temperature, especially when there is a compacted soil layer as a retaining wall, are caused by liquefaction. There is no effective device to explore the relevant landslide mechanism. The landslides under the influence of long-term irrigation, especially when there is a compacted soil layer as a retaining wall, are important engineering challenges facing my country's agricultural areas. Studying its sliding mechanism and sliding process is an important prerequisite for ensuring the quality of cultivated land, ensuring the stability of engineering in agricultural areas, and protecting the lives and property of farmers.

[0004] Most of the current slope test devices place the slope directly under laboratory conditions, without simulating the effects of long-term irrigation conditions and compacted soil layers in actual production and life, resulting in the inability to simulate relevant actual scenarios when the slope is affected by seepage, and the study of landslide mechanism fails to reflect the special environment of long-term irrigation and compacted soil layers, which is inconsistent with the actual application environment. In view of the above reasons, it is urgent to provide a test device for the full process observation of landslide induced by vibration liquefaction of compacted soil layers under long-term irrigation conditions. Summary of the invention

[0005] The purpose of the present invention is to provide a test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions, comprising an environment simulation main box, a slope simulation system, and a compacted soil layer simulation system:

[0007] The environmental simulation box includes a model main box, a slidable simulated irrigation water pipe, a sprinkler device on the top, an angle adjustment device controlled by a computer fixedly connected to the bottom of the model main box, an earthquake simulation device fixedly installed below the angle adjustment mechanism, a refrigeration device fixedly installed on the side inner wall of the model main box, a high-speed camera fixedly installed on one side of the top of the inner wall of the model main box, and a three-dimensional laser scanner adapted to the high-speed camera;

[0008] The slope simulation system includes a slope model, a curtain material for setting a preset sliding surface, and a ditch model for simulating irrigation;

[0009] The compacted soil layer simulation system includes soil materials, and a plurality of ditch-simulating water tanks are provided on the top of the soil materials and are evenly distributed, and a compacted soil layer model is provided in the water tanks;

[0010] The compacted soil layer model is divided into four layers from top to bottom. The first layer has a compacted soil layer top canal, and the three layers below are filled with compacted soil layer materials at equal distances.

[0011] The sprinkler device includes a water tank and a water sprayer. The water tank is connected to the irrigation device through a water pipe. The irrigation device includes an irrigation water pipe. The irrigation water pipe is located between the top parallel end of the soil material and the main pipe body, and a sliding sleeve is provided with a slide rail. The outer wall of the irrigation water pipe is located at the top and bottom of the slide rail and a limit plate is fixedly installed.

[0012] Preferably, a curtain material simulating a preset sliding surface is arranged inside the soil material.

[0013] Furthermore, the main box of the model is made of polyurethane material.

[0014] Furthermore, the top of the soil material is arranged to be inclined.

[0015] Furthermore, curtain materials are arranged between adjacent rammed soil layer materials.

[0016] Furthermore, a water valve, a flow rate sensor, a flow meter and a water flow monitor are arranged in the sprinkler device.

[0017] Furthermore, the refrigeration module includes a plurality of semiconductor chips fixedly installed and arranged in parallel inside the main box of the model, and fans are fixedly installed between adjacent semiconductor chips.

[0018] Furthermore, the angle adjustment device is composed of two angle adjustment connecting rods and a supporting platform, and each angle adjustment connecting rod is composed of a retractable rod, a limit bolt for limiting the sliding direction, and a rotating part connected to the upper model box.

[0019] Furthermore, the earthquake simulation module includes a fixed shell, an inner frame of which is provided with a seismic platform, a plurality of support rods equidistantly distributed and fixedly connected between an outer wall of the seismic platform and one side and one end of the inner frame of the fixed shell, and a spring matched with the support rods is fixedly installed between an outer wall of the seismic platform and the other side and the other end of the inner frame of the fixed shell.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] A test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions. The model box of the invention is fixed on an angle adjustment device, and a support rod and a seismic platform for simulating earthquake factors are provided below the angle adjustment device. The box is equipped with corresponding test devices, environmental simulation devices and monitoring equipment. The test device is based on a fixed compacted soil layer simulation model, and a "main channel" that conforms to the actual situation is provided on the top. The compacted soil layer is divided into four sections according to different laying materials. Different materials are separated by special curtain materials and can be connected to the simulated preset sliding surface. In the "main channel" on the top of the compacted soil layer, a Joint surfaces found during field investigations; monitoring devices such as strain gauges, seepage sensors, and pore water pressure sensors can be loaded on the curtain material of the proposed sliding surface; the environmental simulation device includes a sprinkler, a slidable simulated irrigation water pipe, and a refrigeration device. The sprinkler is arranged above the model box, and a ditch for irrigation is arranged above the soil material. The slidable simulated irrigation water pipe provides water for simulating a long-term irrigation environment. A refrigeration device consisting of a 12706 refrigeration sheet and a fan is arranged on the left side of the box to simulate different temperature environments; monitoring equipment such as a high-speed camera and a three-dimensional laser scanner are also arranged inside the box. The present invention can simulate and monitor the process of landslide induced by vibration liquefaction of compacted soil layers under long-term irrigation conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An overall diagram of a test device for landslide induced by vibration liquefaction of compacted soil layers under long-term irrigation conditions provided by the present invention;

[0023] Figure 2 A side view of a test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions provided by the present invention;

[0024] Figure 3 An overall diagram of a compacted soil layer model provided by the present invention;

[0025] Figure 4 A side view of a compacted soil layer model provided by the present invention;

[0026] Figure 5 An overall diagram of a slide rail device provided by the present invention;

[0027] Figure 6 An overall diagram of the sliding part of a slide rail provided by the present invention;

[0028] Figure 7 A side view of a sliding part of a slide rail provided by the present invention;

[0029] Figure 8 An overall diagram of an angle adjustment device provided by the present invention;

[0030] Fig. 9A side view of an angle adjustment device provided by the present invention;

[0031] Fig.10 A schematic diagram of an angle adjustment connecting rod provided by the present invention;

[0032] Fig.11 An overall diagram of an earthquake simulation module provided by the present invention;

[0033] Fig.12 A top view of an earthquake simulation module provided by the present invention;

[0034] Fig.13 This is a side view of an earthquake simulation module provided by the present invention.

[0035] In the figure: 1. Model main box; 2. Soil material; 3. Water trough simulating ditch; 4. Rammed soil layer model; 41. Water channel on the top of rammed soil layer; 42. Rammed soil layer layer material; 5. Curtain material simulating preset sliding surface; 6. Sprinkler; 7. High-speed camera; 8. Refrigeration device; 9. Slidable simulated irrigation water pipe; 91. Irrigation water pipe; 92. Slide rail; 93. Limiting piece; 10. Water tank; 11. Angle adjustment device; 111. Support platform; 112. Retractable rod; 113. Limiting bolt; 114. Rotating part; 12. Earthquake simulation module; 121. Spring; 122. Support rod; 123. Earthquake platform; 124. Fixed shell. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figure 1-Figure 4As shown, the main box body 1 of the model of the present invention is a rectangular container composed of a polyethylene shell and a polyurethane insulation layer, and a test device is arranged inside it. The top surface of the inner surface of the model box is loaded with a sprinkler 6 with built-in control and monitoring devices and a slidable simulated irrigation water pipe 9. The top surface and side surface of the inner surface of the model box are equipped with a high-speed camera and a three-dimensional laser scanner 7. The side of the model box is equipped with a related refrigeration device 8. The bottom plate of the model box is connected to an angle adjustment device 11, and its angle is adjusted by a computer. An earthquake simulation module 12 is also connected below. The model box is equipped with a compacted soil layer model 4 that is layered according to actual conditions. Its bottom end is fixed on the main box body 1 of the model, and its two sides are equipped with soil materials 2 that are consistent with the engineering situation. The soil material 2 is equipped with a water tank 3 designed to simulate a ditch according to a certain proportion. The soil material has a curtain material 5 that can be equipped with a corresponding monitoring device to simulate a preset sliding surface, and is connected to the layered material 42 of the compacted soil layer model 4 for drawing up a preset sliding surface.

[0038] like Figure 5-Figure 7 As shown, the present invention sets a sprinkler 6 on the top of the model box to provide rainfall conditions for the soil material 2; sets a slidable simulated irrigation water pipe 9 on the top of the model box to provide long-term irrigation conditions for the soil material 2; sets a refrigeration module 8 on the left side of the model box to provide relevant environmental temperature conditions for the main box of the model; a water tank 3 designed and assembled to simulate a ditch according to a certain proportion is assembled on the top of the soil material 2, and the water environment seeps around the soil material 2 and the water tank 3 of the simulated ditch, affecting the strength of the rock material near the curtain material 5 simulating the preset sliding surface and the layered material 42 of the compacted soil layer model, so as to simulate the landslide situation; the excess water will flow into the compacted soil layer model 4 and flow out of the device in a specific way;

[0039] like Figure 1 As shown, the three-dimensional laser scanner 7 is arranged above and on the right of the soil material 2. The three-dimensional laser scanner 7 can monitor and record the real-time status of the soil material 2, so as to simulate the situation in which the water conditions in the actual long-term irrigation scenario seepage from the soil material itself and the water tank used for irrigation affects the strength of the lower soil and causes the slope to become unstable, and can simulate and detect the stability changes of the slope induced by relevant conditions.

[0040] like Figure 8-Figure 13As shown, when in use, first assemble the compacted soil layer model 4 in the model box, arrange the corresponding soil material 2, the ditch simulating water tank 3, and the curtain material 5 simulating the preset sliding surface; adjust the relevant physical simulation parameters of the angle adjustment device 11 and the earthquake simulation module 13 in the computer; open the slidable simulated irrigation water pipe 9 to provide irrigation conditions for the ditch simulating water tank 3; open the refrigeration device 8 as needed, and adjust the parameters such as refrigeration capacity and air intake in the computer module; open the sprinkler 6 as needed, and adjust its flow rate, water volume and other parameters in the computer module. The monitoring system records and analyzes the stability of the landslide under different environmental parameters according to whether the soil material 2 monitored by the high-speed camera and the three-dimensional laser scanner 7 has relative sliding. If the curtain material 5 simulating the preset sliding surface is loaded with strain gauges, seepage sensors, and pore water pressure sensors, the monitoring system can synchronously output the data monitored by the strain gauges, seepage sensors, and pore water pressure sensors on the curtain material 5 simulating the preset sliding surface in real time as needed, and draw relevant curves. The above is one test work. If multiple vibration liquefaction-induced landslide tests of compacted soil layers under long-term irrigation conditions are carried out, the above operations can be repeated.

[0041] Working principle: A ditch for irrigation is arranged above the soil material 2, and a slidable simulated irrigation water pipe 9 provides water to simulate a long-term irrigation environment. A refrigeration device consisting of a 12706 refrigeration sheet and a fan is arranged on the left side of the box to simulate different temperature environments; a high-speed camera, a three-dimensional laser scanner and other monitoring equipment are also arranged inside the box. The present invention can simulate and monitor the process of landslide induced by vibration liquefaction of compacted soil layers under long-term irrigation conditions.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. A test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions, including an environmental simulation main box, a slope simulation system, and a compacted soil layer simulation system: The environmental simulation box comprises a model main box (1), a slidable simulated irrigation water pipe (9), a sprinkler device (6) on the top, an angle adjustment device (11) controlled by a computer fixedly connected to the bottom of the model main box (1), an earthquake simulation device (12) fixedly installed below the angle adjustment mechanism (11), a refrigeration device (8) fixedly installed on the side inner wall of the model main box (1), a high-speed camera (7) fixedly installed on one side of the top of the inner wall of the model main box (1), and a three-dimensional laser scanner adapted to the high-speed camera (7); The slope simulation system comprises a slope model, a curtain material (5) for setting a preset sliding surface, and a ditch model for simulating irrigation; The compacted soil layer simulation system comprises a soil material (2), a plurality of ditch-simulating water tanks (3) arranged at equal distances on the top of the soil material (2), and a compacted soil layer model (4) is arranged inside the water tanks; The compacted soil layer model (4) is divided into four layers from top to bottom, the first layer is provided with a compacted soil layer top water channel (41), and the three layers below are filled with compacted soil layering materials (42) at equal distances; The watering device (6) comprises a water tank (10) and a water spraying shower head. The water tank (10) and the irrigation device are connected to each other through a water pipe. The irrigation device comprises an irrigation water pipe (91). The irrigation water pipe (91) is located between the top parallel end of the soil material (2) and the main pipe body and is slidably sleeved with a slide rail (92). The outer wall of the irrigation water pipe (91) is located at the top and bottom of the slide rail (92) and fixedly installed with a limit plate (93). The angle adjustment device (11) is composed of two angle adjustment connecting rods and a support platform (111). Each angle adjustment connecting rod is composed of a retractable rod (112), a limit sliding rod (113), and a support platform (111). The invention relates to a seismic simulation module (12) comprising a fixed housing (124), an inner frame of which is provided with a seismic platform (123), a plurality of support rods (122) arranged at equal distances being fixedly connected between an outer wall of the seismic platform (123) and one side and one end of the inner frame of the fixed housing (124), and a spring (121) matched with the support rod (122) being fixedly installed between an outer wall of the seismic platform (123) and the other side and the other end of the inner frame of the fixed housing (124).

2. The test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions according to claim 1, characterized in that: A curtain material (5) simulating a preset sliding surface is arranged inside the soil material (2).

3. The test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions according to claim 1, characterized in that: The model main box (1) is made of polyurethane material.

4. The test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions according to claim 1, characterized in that: The top of the soil layer material (2) is arranged in an inclined manner.

5. The test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions according to claim 1, characterized in that: Curtain material is arranged between adjacent rammed soil layer materials (42).

6. The test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions according to claim 1, characterized in that: The watering device (6) is provided with a water valve, a flow rate sensor, a flow meter and a water flow monitor.

7. The test device for landslide induced by vibration liquefaction of compacted soil layer under long-term irrigation conditions according to claim 1, characterized in that: The refrigeration module comprises a plurality of 12706 semiconductor chips which are fixedly installed and arranged in parallel inside the model main box (1), and fans are fixedly installed between adjacent 12706 semiconductor chips.

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