CN216527722U - An experimental device for simulating rainfall and groundwater bidirectional infiltration-induced landslides - Google Patents

Abstract

The utility model discloses an experimental device for simulating rainfall and underground water bidirectional seepage induced landslide. The rainfall device comprises a bearing frame, wherein the bearing frame is hinged with the right end of the bottom of a model device box through a hinge device, the left end of the bottom of the model device box is connected with a hoist device, the hoist device is connected with an integral frame, the top of the model device box is arranged in an opening manner, and a rainfall device is arranged above the model device box; an experimental slope model is stacked in the model device box, and a groundwater infiltration device is arranged at the bottom of the experimental slope model; and a data monitoring sensor is embedded in the experiment slope model. The utility model can simulate the underground water infiltration and rainfall infiltration bidirectional infiltration conditions, can adjust the angle of the model device and the like, and can realize the landslide physical model experiment under the influence of multiple factors.

Description

An experimental device for simulating rainfall and groundwater bidirectional infiltration-induced landslides

technical field

The utility model relates to the technical field of evolution of hydrological parameters and mechanical strength indexes of slope rock and soil, in particular to the research on the evolution process and mechanism of slope failure under the condition of bidirectional infiltration of groundwater seepage and rainfall infiltration in karst areas; It is a device to study the characteristics of the hydrological response of the slope under the influence of different factors, specifically an experimental device for simulating the landslide induced by rainfall and bidirectional infiltration of groundwater.

Background technique

In recent years, in the karst area of southwest China, due to its complex engineering geological conditions and abundant annual rainfall, large and small landslide disasters have occurred every year, such as the Guanling landslide on June 28 in 2010, the huge landslide in Shuicheng on July 23 in 2019, and the landslide in 2020. 8.3 The Songtao Ganlong landslide seriously endangered the life and property of the local residents. However, landslide disasters in karst mountainous areas have the characteristics of complex disaster-pregnancy mechanism, wide disaster-causing scope, difficulty in early identification, and strong suddenness. At present, there are few studies on this type of landslide by domestic and foreign scholars, mainly focusing on the reservoir bank landslide caused by the rise and fall of the reservoir water level. However, the research on the potential groundwater level in karst areas to induce landslides under heavy rainfall is somewhat immature.

Landslide disasters are one of the most prone and destructive natural disasters. Therefore, it is extremely important to understand the inducing mechanism and evolution process of such disasters for the evaluation of landslide-prone areas. The experimental device of the landslide has practical significance for the study of this type of landslide.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide an experimental device for simulating the landslide induced by the bidirectional infiltration of rainfall and groundwater. The utility model can simulate the two-way infiltration conditions of groundwater infiltration and rainfall infiltration, can adjust the angle of the model device, etc., so as to realize the physical model experiment of landslide under the influence of multiple factors.

The technical scheme of the utility model is an experimental device for simulating the landslide induced by rainfall and groundwater bidirectional infiltration, which is characterized in that it comprises a bearing frame, the bearing frame is hinged with the bottom right end of the model device box through a hinge device, and the bottom left end of the model device box is connected The hoist device, the hoist device is connected to the overall frame, the top of the model device box is provided with an opening, and the top of the model device box is provided with a rainfall device; the model device box is provided with an experimental slope model, and the bottom of the experimental slope model is provided with groundwater intake Infiltration device; the experimental slope model is provided with a data monitoring system.

In the aforementioned experimental device for simulating rainfall and groundwater bidirectional infiltration-induced landslide, the rainfall device includes a rainfall sprinkler set above the model device box, connected to a flow meter through a water pipe, and a water pump connected to a simulated rainfall water supply tank.

In the above-mentioned experimental device for simulating rainfall and groundwater bidirectional infiltration-induced landslide, the groundwater infiltration device includes a bedrock fissure water supply device on the bottom plate of the model box of the experimental slope model, and the bedrock fissure water supply device is arranged in the experiment. It consists of PVC pipes at the bottom of the slope model with holes provided on the PVC pipes.

In the aforementioned experimental device for simulating rainfall and groundwater bidirectional infiltration-induced landslide, the model device box is provided with a groundwater inlet hole; the bedrock fissure water supply device is connected to the groundwater inlet hole, and the groundwater inlet hole is connected to a water pipe , the water pipe connects the groundwater to the water tank.

In the above-mentioned experimental device for simulating rainfall and groundwater bidirectional infiltration-induced landslide, one side of the groundwater supply tank is provided with water overflow ports of different heights and equal intervals, and the water overflow ports are connected to water pipes, and the water pipes are connected to water valves.

In the aforementioned experimental device for simulating a landslide induced by rainfall and groundwater bidirectional infiltration, the model device box is provided with a piezometric pipe hole; the data monitoring system includes a pressure measuring pipe connected to the piezometric pipe hole in the experimental slope model. The tube, the pressure measuring tube is connected to the sensor, the sensor is connected to the data collector, and the data collector is connected to the display.

In the aforementioned experimental device for simulating a landslide induced by rainfall and bidirectional infiltration of groundwater, the sensor includes a group of sensors embedded in the experimental slope model at different heights.

Compared with the prior art, the utility model has the following beneficial effects:

1. The overall structure of the utility model is relatively simple, there is no complicated parallel relationship between the structures, the installation of the units does not affect each other, and the raw materials are conventional materials, which are easy to obtain and the price is considerable.

2. One end of the model device box of the present utility model is hinged and the other end uses a chain hoist, which facilitates changing the angle of the model device box and has better stability.

3. The device for simulating groundwater water supply uses PVC pipes to open holes and attach nylon filters to control the scope and size of groundwater water supply, and prevent the slope structure from being damaged due to the impact of water flow, which more truly reflects the bedrock fissures. The way water penetrates.

4. The utility model can realize the two-way infiltration conditions of groundwater infiltration and rainfall infiltration, and can be used to study the evolution characteristics of the landslide body, the movement process of the slope body and the hydrological response characteristics under such conditions.

5. The utility model can realize the research on the influence of different hydraulic gradient infiltration on the change of the hydrological parameters in the slope body through the different water flow overflow ports designed by the groundwater water supply device.

Description of drawings

Fig. 1 is the structural representation of the present utility model;

2 is a schematic diagram of the arrangement of the pressure measuring tube holes of the present invention;

Fig. 3 is the structural representation of the pressure measuring tube of the present utility model;

4 is a schematic structural diagram of a simulated bedrock fissure water supply device of the present invention;

5 is a schematic structural diagram of the hoist device and the overall frame of the present invention;

Fig. 6 is the structural schematic diagram of the model device box of the present invention, the bearing frame and the hinge device;

Figure 7 is a schematic diagram of the structure of the groundwater supply tank.

The symbols in the drawings are: 1-model device box, 2-bearing frame, 3-integral frame, 4-groundwater supply tank, 5-data collector, 6-display, 7-simulated rainfall supply tank, 8-water pump, 9 - Flow meter, 10- Model box bottom plate, 11- Bedrock fissure water supply device, 12- Groundwater inlet hole, 13- Piezometric pipe hole, 14- Sensor, 15- Experimental slope model, 16- Pressure measuring pipe, 17 - Hinged device, 18- hoist device, 19- rainfall sprinkler, 20- water valve.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation , are constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

Example. An experimental device for simulating a landslide induced by rainfall and groundwater two-way infiltration, as shown in Figure 1-6, includes a bearing frame 2, the bearing frame is hinged with the bottom right end of the model device box 1 through a hinge device 17, and the bottom of the model device box 1 is hinged. The left end is connected with a hoist device 18, and the hoist device 18 is connected with the overall frame 3. The top of the model device box 1 is provided with an opening, and a rainfall device is arranged above the model device box 1; the left part of the model device box 1 is provided with an experimental slope Model 15, the bottom of the experimental slope model 15 is provided with a groundwater infiltration device; the experimental slope model 15 is provided with a data monitoring system.

In addition to the frame for installing the hoist device 18, the overall frame 3 also includes other necessary frames, such as: an auxiliary frame for installing a rainfall device, a frame for installing a groundwater supply tank, etc. The material of the frame is preferably stainless steel. .

The bearing frame 2 is constructed of several steel pieces, and one end is connected with the two corners of one side of the model box by means of hinges.

The hoist device 18 is preferably a manual hoist. The left end of the bottom of the model device box 1 is connected to the hoist device 18 through an iron chain. slope.

Preferably, the left, right and rear sides of the model device box 1 are made of acrylic material; the bottom surface is made of steel plate, and is provided with a water inlet hole; the front side and the top surface are provided with openings, and the acrylic plate and the steel plate Use enough glass glue to seal the model box to ensure that the model box does not leak. The model device box 1 can be rotated on the carrier frame 2 by means of a hinge device 17 .

The rainfall device includes a rainfall sprinkler 19 arranged above the model device box 1 , and is connected to a flow meter 9 through a water pipe, and a water pump 8 is connected to a simulated rainfall water supply tank 7 . The simulated rainfall water supply tank 7 that provides rainfall is pumped through a water pump 8, and then connected to a flow meter 9. The function of the water pump 8 is to maintain the stability of the water supply pressure; the function of the flow meter 9 is to cooperate with the rainfall sprinkler 19, thereby realizing control rainfall intensity.

The groundwater infiltration device includes a bedrock fissure water supply device 11 on the bottom plate 10 of the model box of the experimental slope model 15. The bedrock fissure water supply device 11 is composed of PVC pipes arranged at the bottom of the experimental slope model 15. There are holes. The bedrock fissure water supply device 11 is made of PVC material, and the elbow is connected by a PVC elbow and a tee pipe, and a plurality of holes are arranged in the PVC pipe, and each pipe is glued with a nylon filter screen with a diameter of 0.075mm.

The model device box 1 is provided with a groundwater inlet hole 12 ; the bedrock fissure water supply device 11 is connected to the groundwater inlet hole 12 , the groundwater inlet hole 12 is connected to a water pipe, and the water pipe is connected to the groundwater water supply tank 4 . There is a water valve on the water pipe.

The groundwater supply water tank 4 is made of acrylic material. There are multiple water overflow outlets at different heights on one side of the box body at equal intervals, and water pipes and water valves are installed to control the head height of the simulated groundwater and realize the adjustment of groundwater. strength and different hydraulic gradients.

Preferably, the size of the groundwater inlet hole 12 of the groundwater water supply tank 4 is the same as the diameter of the PVC pipe of the aforementioned bedrock fissure water supply device 11, and the tee pipe passes through this hole and is sealed with glass glue.

The model device box 1 is provided with a pressure measuring pipe hole 13 ; the data monitoring system includes a sensor 14 embedded in the experimental slope model 15 for monitoring slope hydrological parameters. The pressure measuring tube 16 connected to the pressure measuring tube hole 13, the sensor 14 is embedded through a prefabricated hole with a diameter slightly larger than that of the pressure measuring tube 13, the sensor 14 is connected to the data collector 5, and the data collector 5 is connected to the display 6. The display 6 is connected to the data acquisition system (data acquisition device 5 ) for viewing and storing experimental data.

Preferably, the sensors 14 include the volume water content sensor is ECH2OEC-5 from METER, the substrate suction sensor is TEROS21 from METER, and the pore water pressure sensor is HC-25 from Beijing Ruiheng Changtai Technology Co., Ltd. During the experiment, due to the increase of water content in the slope body, the sensor 14 responds, and the volumetric water content and pore water pressure tend to increase with the increase of water content. According to the principle of effective stress, the matrix suction tends to decrease. . From the analysis of the data collected from the experiment, the changes of the data monitored by the sensor basically conform to the change trend of the theoretical analysis.

Preferably, the data collector 5 is a Campbell product with a model of CR1000X. The advantages are: high-resolution measurements (24-bit Adc) that can distinguish even small changes in data values; includes a microSD card drive for extended storage requirements. The collector 5 is connected to the sensor 14 and connected to a display for acquiring the data collected by the sensor 14 . The collection frequencies of the collectors in this embodiment are 1 Hz and 20 Hz, and the collection frequency of 1 Hz is adopted in this embodiment.

The display 6 can directly use a notebook computer to meet the experimental requirements, and the real-time query and storage of the collected data can be realized through the relevant software, and the data transmission can be completed by using the external storage.

Preferably, the pressure measuring tube 16 is made of acrylic material, and is installed on one side of the model device box 1. The pressure measuring tube holes 13 are arranged at equal intervals, and multiple rows of pressure measuring tube holes 13 are preset at the elbow of the pressure measuring tube 16. It is connected by PVC elbows to ensure the stability of the joints and the seepage of the later experiments without any resistance.

The sensors 14 include a set of sensors arranged at different heights in the experimental slope model 15 .

The implementation process of the present utility model is:

First, place the model device box 1 flat on the bearing frame 2, place the bedrock fissure water supply device 11 at the bottom of the model device box 1, and then fill the pile with the prepared soil samples in layers. The layer is leveled, and the experimental slope model 15 is gradually formed. Note that when filling to the pre-embedded position of the sensor 14, place the sensor lightly on this level to prevent damage to the sensor. When the experimental slope model 15 is filled, it is connected to the model device box 1 through the hoist device 18, and its inclination angle is changed to achieve the experimental design slope and fix it. Secondly, the forming experiment slope model 15 is protected from rain, the water pump 8 and the flow meter 9 are turned on, the number of rain sprinklers 19 is adjusted to achieve the designed rainfall intensity, and the relationship between the rainfall intensity and the flow meter 9 and the rain sprinkler 19 is well established. , which is convenient for later experiments; inject water into the groundwater supply tank 4 to make it reach the preset head position, open the water valve at the bottom of the groundwater supply tank 4, adjust the relationship between the supply water and the water outlet, and keep the head position at a constant head; Camera equipment is set up at reasonable positions on the side and slope to record the experimental process and provide image data for later analysis of experimental results; after the completion of the preparatory work for the current phase, check the data collection status through the display 6, and after confirming that the data collection is normal, turn on the water pump 8 and flowmeter 9 to make the simulated rainfall equipment supply normal water, open the water valve at the bottom of the groundwater supply tank 4 to make the groundwater supply normal, and remove the rain shelter equipment on the slope surface, and the experiment officially begins. When the shape of the slope body is changed to a certain shape and the slope surface has stable seepage and remains stable for a long time, the experiment can be considered to be over, and the rainfall equipment and groundwater supply water are turned off, and different parts of the slope are sampled for particle analysis. External storage to download experimental data.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (7)

1. The utility model provides an experimental apparatus of landslide is induced in two-way infiltration of rainfall simulation and groundwater which characterized in that: the device comprises a bearing frame (2), wherein the bearing frame is hinged with the right end of the bottom of a model device box (1) through a hinge device (17), the left end of the bottom of the model device box (1) is connected with a hoist device (18), the hoist device (18) is connected with an integral frame (3), the top of the model device box (1) is provided with an opening, and a rainfall device is arranged above the model device box (1); an experimental slope model (15) is arranged at the left part of the model device box (1), and a groundwater infiltration device is arranged at the bottom of the experimental slope model (15); and a data monitoring system is arranged in the experiment slope model (15).

2. The experimental device for simulating rainfall and groundwater bidirectional infiltration induced landslide of claim 1, wherein: the rainfall device comprises a rainfall spray head (19) arranged above the model device box (1), a flowmeter (9) is connected through a water pipe, and a rainfall simulation water supply tank (7) is connected behind a water pump (8).

3. The experimental device for simulating rainfall and groundwater bidirectional infiltration induced landslide of claim 1, wherein: the underground water infiltration device comprises a bedrock fracture water supply device (11) on a model box bottom plate (10) of an experimental slope model (15), wherein the bedrock fracture water supply device (11) is composed of PVC pipes arranged at the bottom of the experimental slope model (15), and holes are formed in the PVC pipes.

4. The experimental facility for simulating rainfall and groundwater bidirectional infiltration induced landslide of claim 3, wherein: an underground water inlet hole (12) is formed in the model device box (1); the bedrock fracture water supply device (11) is connected with the underground water inlet hole (12), the underground water inlet hole (12) is connected with the water pipe, and the water pipe is connected with the underground water supply tank (4).

5. The experimental facility for simulating rainfall and groundwater bidirectional infiltration induced landslide of claim 4, wherein: one side of the underground water supply tank (4) is provided with water overflow outlets with different heights and equal spacing distances, the water overflow outlets are connected with water pipes, and the water pipes are connected with water valves (20).

6. The experimental device for simulating rainfall and groundwater bidirectional infiltration induced landslide of claim 1, wherein: the model device box (1) is provided with a pressure tube hole (13); the data monitoring system comprises a pressure measuring pipe (16) which is arranged in an experimental slope model (15) and connected with a pressure measuring pipe hole (13), the pressure measuring pipe (16) is connected with a sensor (14), the sensor (14) is connected with a data acquisition unit (5), and the data acquisition unit (5) is connected with a display (6).

7. The experimental facility for simulating rainfall and groundwater bidirectional infiltration induced landslide of claim 6, wherein: the sensors (14) comprise a group of sensors embedded in the experimental slope model (15) at different heights.

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