Identification method and structure of sliding surface stress concentration in scaled model test of interface-type landslide

Abstract

The present invention discloses a method and structure for identifying stress concentration on the sliding surface of an interface-type landslide scale model test, comprising bedrock; an overlying soil body disposed on the bedrock, wherein the contact surface between the overlying soil body and the bedrock forms a sliding interface; a roller disposed at the sliding interface, wherein a portion of the roller is located in the overlying soil body and the other portion is located in the bedrock; a protective shell disposed in the bedrock, wherein the roller is rotatably installed in the protective shell, and the protective shell isolates the roller from the bedrock; a monitoring component, which comprises a monitoring module, a controller, and a display module, wherein the monitoring module is used to monitor the rotation speed and rotation distance of the roller, and the controller is used to receive and process the monitoring information of the monitoring module and display it through the display module. The present application can observe the law of displacement development of the sliding interface existing inside the soil body, and observe the process of soil bodies at different positions in the sliding interface from being unstressed to emergency concentration and then to stress concentration destruction from a dynamic perspective, thereby discriminating the development of the sliding surface of the scale model test.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical engineering scale model tests, and in particular to a method and structure for identifying stress concentration on a sliding surface in an interface-type landslide scale model test. Background Art

[0002] Scaled model test is an important test method for studying landslide process. Its purpose is to use small-sized test components to control the test process. At present, most experts and scholars use artificial precipitation, artificial thrust, vibration of vibration table, and change of slope angle to make the scaled model slope start to slide, and then further study the movement development of the slope.

[0003] Due to the limitations of technical equipment, most experts and scholars currently focus on observing the surface of the landslide after the slope starts sliding, and are unable to observe the state of the soil in the sliding interface. How to dynamically observe the stress conditions of the soil in the sliding surface in a scaled model is the current problem. Summary of the Invention

[0004] The present invention provides a method and structure for identifying stress concentration on the sliding surface of a scaled model test of an interface-type landslide. The method can observe the law of displacement development of the sliding interface existing inside the soil body, and dynamically observe the process of soil bodies at different positions in the sliding interface from being unstressed to emergency concentration and then to stress concentration failure, thereby determining the development of the sliding surface in the scaled model test.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The sliding surface stress concentration identification structure of the interface type landslide scale model test of the present invention comprises:

[0007] bedrock;

[0008] An overlying soil body is provided on the bedrock, wherein a contact surface between the overlying soil body and the bedrock forms a sliding interface;

[0009] A roller is provided at the sliding interface, with a portion thereof located in the overlying soil and another portion located in the bedrock, and the roller is capable of rotating as the overlying soil slides;

[0010] A protective shell is provided in the bedrock, wherein the roller is rotatably mounted in the protective shell, and the protective shell isolates the roller from the bedrock;

[0011] The monitoring component includes a monitoring module, a controller and a display module. The monitoring module is used to monitor the rotation speed and rotation distance of the roller. The controller is used to receive and process the monitoring information of the monitoring module and display it through the display module.

[0012] The present invention provides an interface-type landslide scale model test sliding surface stress concentration identification structure. Further, the monitoring module includes a Hall sensor, which is arranged in a protective shell and is used to monitor the rotation speed and rotation distance of the roller.

[0013] The invention provides a sliding surface stress concentration identification structure for an interface-type landslide scale model test. Furthermore, the bedrock and the overlying soil are arranged in a test box.

[0014] The present invention provides a structure for identifying stress concentration on a sliding surface in a scaled model test of an interface-type landslide. Furthermore, a casing is installed on the protective shell, and the casing penetrates the bedrock and exits from the bottom of the test box; a counting wire is connected to the roller, and the counting wire can be wound around the roller when the roller rotates; the counting wire passes through the casing and is connected to a reel, and the monitoring module is used to monitor the rotation speed and rotation distance of the reel to determine the rotation speed and rotation distance of the roller.

[0015] The invention provides a sliding surface stress concentration identification structure for an interface-type landslide scale model test. Furthermore, the roller is a high-friction double-rubber wheel.

[0016] The invention provides an interface-type landslide scale model test sliding surface stress concentration identification structure. Further, a positioning steel rod is provided in the casing, one end of the positioning steel rod passes through the bottom of the test box and is provided with a fixing piece, and the fixing piece is hooked on the bottom of the test box.

[0017] The present invention provides a structure for identifying stress concentration on the sliding surface of a scaled model test of an interface-type landslide. Further, the display module includes a display and an indicator light. The display is used to display the rotation speed and rotation distance of the roller. The indicator lights correspond to the rollers one-to-one. When the monitoring module detects that the roller is rotating, the controller controls the corresponding indicator light to flash. The faster the rotation speed, the faster the flashing frequency of the indicator light.

[0018] The present invention provides a method for identifying stress concentration on a sliding surface of an interface-type landslide scale model test, comprising the following steps:

[0019] S1: Based on the position of the sliding interface in the scaled-down landslide model test, multiple rollers are deployed, and protective shells are pre-buried in the bedrock to isolate the rollers from the bedrock and subject them only to the friction of the overlying soil;

[0020] S2: Gradually apply external force to the landslide model to initiate the sliding of the overlying soil;

[0021] S3: The rotation speed and distance of the roller are monitored by the monitoring component to observe the process of the overburden at different positions in the sliding interface from no stress to stress concentration and then to stress concentration failure, thereby determining the development of the sliding surface in the scaled model test.

[0022] The present invention provides a method for identifying stress concentration on a sliding surface in a scaled model test of an interface-type landslide. Further, a counting wire is connected to the roller, a casing is connected to the protective shell, the casing and the protective shell are pre-buried in the bedrock, and one end of the casing extends from the bottom of the test box, and the counting wire extends from the casing to be connected to a reel outside the test box; the rotation speed and rotation distance of the reel are monitored by a monitoring component to determine the rotation speed and rotation distance of the roller.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The core of this application is to install numerous rollers in the sliding interface of a scaled model. Their primary purpose is to determine the state of the overlying soil in the sliding interface during the sliding process of the overlying soil based on the rolling length and rotation speed of the rollers at different locations. According to relevant theory, areas with greater sliding deformation and faster deformation speeds are less likely to experience stress concentration, while areas with shorter sliding distances or no sliding deformation are the primary areas for resisting slope downturn.

[0025] 2. The roller device of this application can passively record the deformation displacement length of the sliding surface, which can be converted into a theoretical evaluation of the dynamic development deformation of the soil in each area of ​​the sliding interface and dynamically analyze the area of ​​stress concentration in the sliding interface;

[0026] 3. This application can determine the nature of the sliding zone in the area where the roller is located based on the roller rotation distance. That is, the longer the sliding distance, the more likely it is that a sliding interface has formed. The area where no displacement occurs is a stress concentration area, which is the main factor in resisting slope sliding.

[0027] 4. This application can determine the speed of the sliding surface and the size of the sliding zone based on the flashing frequency and number of flashes of the signal light;

[0028] 5. This application can observe the displacement development patterns of the sliding interface within the soil. From a dynamic perspective, it can observe the process of soil at different locations on the sliding interface from no stress to emergency concentration and then to stress concentration failure. It can then determine the development of the sliding surface in the scaled model test. This solves the current problem of being unable to dynamically observe the stress conditions of the soil on the sliding surface in a scaled model. It can be used in conjunction with various types of interface-type landslide scaled model tests, expanding the scope of scaled model testing.

[0029] 6. By setting up a display device, the indicator light dynamically displays the status of each rubber wheel. When the deformation length is longer and the deformation rate is faster, the indicator light flashes faster and the number of flashes is greater, indicating that the stress concentration state is destroyed and the sliding surface is formed; when the indicator light does not flash or the flashing frequency is slow, stress concentration exists in the soil area where the rubber wheel is located.

[0030] The present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 Schematic diagram of the structure of the roller of the present invention;

[0033] Figure 3 Schematic diagram of the monitoring component of the present invention.

[0034] Reference numerals:

[0035] 1. Test chamber; 2. Bedrock; 3. Overlying soil; 4. Roller; 5. Protective shell; 6. Casing; 7. Counting wire; 8. Positioning steel rod; 9. Fixing parts; 10. Reel; 11. Controller; 12. Indicator light. DETAILED DESCRIPTION

[0036] like Figure 1-Figure 3 As shown, the present invention provides a method and structure for identifying stress concentration on the sliding surface of an interface-type landslide scale model test.

[0037] Example 1:

[0038] The structure includes a test box 1, a bedrock 2 located in the test box 1, and an overlying soil 3 located on the bedrock 2. The contact surface between the overlying soil 3 and the bedrock 2 forms a sliding interface, wherein in an interface-type landslide, it is assumed that the bedrock 2 does not deform.

[0039] A roller 4 is provided at the sliding interface, part of the roller 4 is located in the overlying soil 3, and the other part is located in the bedrock 2. The roller 4 can slide and rotate along with the overlying soil 3. In the embodiment of the present application, the roller 4 uses a high-friction double-rubber wheel.

[0040] A protective shell 5 is provided in the bedrock 2 , and the roller 4 is rotatably installed in the protective shell 5 . The protective shell 5 isolates the roller 4 from the bedrock 2 so that the roller 4 is only subjected to the friction force of the overlying soil 3 .

[0041] A sleeve 6 is installed on the protective shell 5, and the sleeve 6 passes through the bedrock 2 and comes out from the bottom of the test box 1. A counting line 7 is connected to the roller 4, and the counting line 7 can be wound around the roller 4 when the roller 4 rotates. The counting line 7 passes through the sleeve 6 and is connected to the reel 10; in addition, a positioning steel rod 8 is provided in the sleeve 6, and one end of the positioning steel rod 8 passes through the bottom of the test box 1 and is provided with a fixing part 9. The fixing part 9 is claw-shaped and hooked on the bottom of the test box 1.

[0042] In the embodiment of the present application, a monitoring component is further included. The monitoring component includes a monitoring module, a controller 11, and a display module. The monitoring module is used to monitor the rotation speed and rotation distance of the reel 10. The controller 11 receives monitoring information from the monitoring module and displays the rotation speed and rotation distance on the display module. In the embodiment of the present application, the monitoring module is a Hall sensor, but it can also be other types of sensors that monitor rotation speed and rotation distance.

[0043] The display module includes a display and an indicator light 12, both of which are electrically connected to the controller 11. The display is used to display the rotation speed and rotation distance of the roller 4; the number and position of the indicator lights 12 correspond one-to-one with the roller 4. When the monitoring module detects that the roller 4 is rotating, the controller 11 controls the corresponding indicator light 12 to flash. The faster the rotation speed, the faster the flashing frequency of the indicator light 12; at the same time, the range of the sliding area can be judged according to the number of flashing indicators 12.

[0044] Example 2:

[0045] The difference from the first embodiment is that the monitoring component directly monitors the rotation speed and rotation distance of the roller 4 , and the monitoring module includes a Hall sensor, which is arranged in the protective shell 5 and is used to monitor the rotation speed and rotation distance of the roller 4 .

[0046] Example 3:

[0047] S1: According to the position of the sliding interface in the scaled test of the landslide model, multiple rollers 4 are arranged, and the protective shell 5 is pre-buried in the bedrock 2, so that the roller 4 is isolated from the bedrock 2 and is only subjected to the friction of the overlying soil 3; a counting line 7 is connected to the roller 4, and a casing 6 is connected to the protective shell 5. The casing 6 and the protective shell 5 are pre-buried in the bedrock 2, and one end of the casing 6 passes through the bottom of the test box 1. The counting line 7 passes through the casing 6 and is connected to the reel 10 outside the test box 1.

[0048] S2: Gradually apply external force to the landslide model to cause the overlying soil 3 to start sliding.

[0049] S3: The rotation speed and rotation distance of the roller 4 are monitored by the monitoring component, and the process of the overburden 3 at different positions in the sliding interface from no stress to stress concentration and then to stress concentration failure is observed, thereby judging the development of the sliding surface in the scaled model test.

[0050] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. The structure of stress concentration identification on sliding surface of interface type landslide scale model test is characterized by: include: bedrock (2); An overlying soil body (3) is provided on the bedrock (2), wherein the contact surface between the overlying soil body (3) and the bedrock (2) forms a sliding interface; A roller (4) is provided at the sliding interface, a portion of which is located in the overlying soil (3) and another portion of which is located in the bedrock (2), and the roller (4) is capable of sliding and rotating along with the overlying soil (3); A protective shell (5) is provided in the bedrock (2), wherein the roller (4) is rotatably mounted in the protective shell (5), and the protective shell (5) isolates the roller (4) from the bedrock (2); A monitoring component comprising a monitoring module, a controller (11) and a display module, wherein the monitoring module is used to monitor the rotation speed and rotation distance of the roller (4), and the controller (11) is used to receive and process monitoring information from the monitoring module and display it through the display module; The bedrock (2) and the overlying soil (3) are arranged in a test box (1); a sleeve (6) is installed on the protective shell (5), and the sleeve (6) passes through the bedrock (2) and passes through the bottom of the test box (1); a counting line (7) is connected to the roller (4), and the counting line (7) can be wound around the roller (4) when the roller (4) rotates; the counting line (7) passes through the sleeve (6) and is connected to the reel (10), and the monitoring module is used to monitor the rotation speed and rotation distance of the reel (10) to determine the rotation speed and rotation distance of the roller (4).

2. The sliding surface stress concentration identification structure for interface-type landslide scale model test according to claim 1 is characterized in that: The monitoring module comprises a Hall sensor, which is arranged in a protective shell (5) and is used to monitor the rotation speed and rotation distance of the roller (4).

3. The sliding surface stress concentration identification structure for interface-type landslide scale model test according to claim 1 is characterized in that: The roller (4) is a high-friction double-rubber wheel.

4. The sliding surface stress concentration identification structure for interface-type landslide scale model test according to claim 1 is characterized in that: A positioning steel rod (8) is provided in the sleeve (6), one end of the positioning steel rod (8) passes through the bottom of the test box (1) and is provided with a fixing piece (9), and the fixing piece (9) is hooked on the bottom of the test box (1).

5. The sliding surface stress concentration identification structure for interface-type landslide scale model test according to claim 1 is characterized in that: The display module comprises a display and an indicator light (12), wherein the display is used to display the rotation speed and rotation distance of the roller (4), and the indicator light (12) corresponds to the roller (4) in a one-to-one manner. When the monitoring module detects that the roller (4) is rotating, the controller (11) controls the corresponding indicator light (12) to flash, and the faster the rotation speed, the faster the flashing frequency of the indicator light (12).

6. A method for identifying the stress concentration structure of a sliding surface by using a scaled model test of an interface-type landslide according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Based on the position of the sliding interface in the scaled-down landslide model test, multiple rollers (4) are arranged, and a protective shell (5) is pre-buried in the bedrock (2), so that the rollers (4) are isolated from the bedrock (2) and are only subjected to the friction force of the overlying soil (3); S2: Gradually apply external force to the landslide model to start the sliding of the overlying soil (3); S3: The rotation speed and rotation distance of the roller (4) are monitored by the monitoring component, and the process of the overburden (3) at different positions in the sliding interface from no stress to stress concentration and then to stress concentration failure is observed, thereby judging the development of the sliding surface in the scaled model test.

7. The method for identifying sliding surface stress concentration in a scaled model test of an interface-type landslide according to claim 6, characterized in that: The roller (4) is connected to a counting line (7), and the protective shell (5) is connected to a sleeve (6). The sleeve (6) and the protective shell (5) are pre-buried in the bedrock (2), and one end of the sleeve (6) passes through the bottom of the test box (1). The counting line (7) passes through the sleeve (6) and is connected to a reel (10) outside the test box (1). The rotation speed and rotation distance of the reel (10) are monitored by a monitoring component to determine the rotation speed and rotation distance of the roller (4).

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