Indoor model test device for simulating limited-width non-viscous filling behind wall

Abstract

The invention discloses an indoor model test device for simulating limited-width non-viscous filling behind a wall. A box body is provided with an accommodating space; the first blocking piece is slidably connected with the bottom of the containing space, and a first pressure sensor is arranged on the first blocking piece. The second blocking piece and the first blocking piece are oppositely arranged and connected with the box body through a driving mechanism, and a displacement sensor and a second pressure sensor are arranged on the second blocking piece; the data acquisition module is electrically connected with the data analysis module, and the data acquisition module is also electrically connected with the first pressure sensor, the displacement sensor and the second pressure sensor. According to the device, the soil pressure condition of limited-width non-viscous filling soil behind a wall is simulated through the first blocking piece and the second blocking piece, the second blocking piece is promoted to move towards the first blocking piece through the driving mechanism to promote sand extrusion, and then the pressure change is simulated; the soil pressure based on dynamic change can better reflect the pressure condition of a natural slope surface or an existing building outer wall structure in actual engineering.

Description

Technical Field

[0001] The invention relates to the technical field of fill test devices, in particular to an indoor model test device for simulating non-viscous fill with limited width behind a wall. Background Art

[0002] With the rapid development of infrastructure construction, the construction of new structures adjacent to existing structures is becoming more and more common, resulting in the frequent occurrence of limited width fill behind retaining walls. Whether it is a road or lock expansion project, an underground project adjacent to an existing structure, or a project with narrow construction space, the construction method and the stress of the retaining structure are often affected by factors such as existing structures, geological conditions, and environmental protection. Traditional theoretical methods and empirical formulas have been unable to accurately predict the stress and deformation characteristics of retaining structures and soil under complex conditions. How to build retaining structures in a limited space while meeting the requirements of durability and stability is an urgent problem to be solved. In order to deeply study the inducing mechanism and deformation evolution law of this problem, it is necessary to carry out indoor model tests scientifically in accordance with the requirements of similarity theory, so as to reproduce the actual failure mode and soil pressure distribution law of limited width fill behind the wall in a repeatable, systematic, and economical manner.

[0003] In existing studies, scholars have found that when the width of the backfill behind the wall is small enough, the soil body is subject to the boundary constraints of the walls on both sides and the friction at the wall-soil interface during the deformation and failure process, and the development trend of the failure sliding surface and the size of the soil pressure will be significantly smaller than the "semi-infinite" backfill behind the wall. The centrifuge model test of the existing technology records the active soil pressure and static soil pressure of the backfill with limited width behind the wall respectively, and fails to observe the deformation of the soil body. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is that the prior art can record the active earth pressure and static earth pressure of the limited width backfill behind the wall through a simulation test device, but cannot obtain the earth pressure change of the simulated earth wall in the test device.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: an indoor model test device for simulating non-viscous fill with limited width behind a wall, comprising a box body, wherein the box body has a containing space; A first stopper is disposed in the accommodating space and slidably connected to the bottom of the accommodating space, and a first pressure sensor is disposed on the first stopper; a second stopper, arranged opposite to the first stopper and connected to one side of the box body through a driving mechanism, wherein a displacement sensor and a second pressure sensor are arranged on the second stopper; The monitoring device comprises a data acquisition module and a data analysis module, wherein the data acquisition module is electrically connected to the data analysis module, and the data acquisition module is also electrically connected to the first pressure sensor, the displacement sensor and the second pressure sensor; Among them, the accommodating space in the box is used to fill sand and soil. After the sand and soil are stationary, the driving mechanism is controlled to displace the second stopper to squeeze the sand and soil. The monitoring device obtains the data collected by the first pressure sensor, the displacement sensor and the second pressure sensor through the data acquisition module to analyze and obtain the changes in sand and soil pressure acting on the first stopper and the second stopper.

[0008] As a preferred solution of the indoor model test device for simulating limited width non-cohesive fill behind a wall described in the present invention, the monitoring device also includes a camera module, which is used to take images at set intervals when the second stopper displaces and squeezes the sand and transmits them to the data analysis module.

[0009] As a preferred solution of the indoor model test device for simulating non-viscous fill with limited width behind a wall described in the present invention, a bearing platform is arranged at the bottom of the box.

[0010] As a preferred solution of the indoor model test device for simulating limited width non-viscous fill behind a wall described in the present invention, the first baffle includes a base plate and a rotating plate, the rotating plate is located at one end of the base plate and is rotatably connected to the base plate through a rotating bearing, and the base plate is slidably connected to the bottom of the box body.

[0011] As a preferred solution of the indoor model test device for simulating limited width non-viscous fill behind a wall described in the present invention, a first slide rail is arranged on the bottom plate, and the bottom plate is threadedly connected to the bottom of the box body by a first bolt passing through the first slide rail for fixation.

[0012] As a preferred solution of the indoor model test device for simulating limited width non-cohesive fill behind a wall according to the present invention, wherein: a second slide rail is arranged on the bottom plate, a third slide rail is arranged on the rotating plate, the second slide rail and the third slide rail are directly connected through a support plate, one end of the support plate is connected to the second slide rail through a second bolt, and the other end of the support plate is connected to the third slide rail through a third bolt; The angle between the rotating plate and the bottom plate is fixed by connection with the supporting plate.

[0013] As a preferred solution of the indoor model test device for simulating limited width non-viscous fill behind a wall described in the present invention, the second baffle comprises a movable plate, the movable plate is arranged opposite to the rotating plate, the side of the movable plate facing away from the rotating plate is connected to a driving mechanism, and the driving mechanism is used to drive the movable plate to approach or move away from the rotating plate.

[0014] As a preferred solution of the indoor model test device for simulating limited width non-viscous fill behind a wall described in the present invention, wherein: a plurality of displacement sensors are arranged along the height direction of the box body, and the displacement sensor is arranged in the box body through a support rod, and the support rod connects the top wall and the bottom wall of the box body, and the displacement sensor is installed on the support rod. The displacement sensor has a top rod, and the top rod is connected to the moving plate. The movement of the moving plate drives the top rod to move to detect the displacement of the moving plate.

[0015] As a preferred solution of the indoor model test device for simulating non-viscous fill with limited width behind a wall described in the present invention, a cushion block is arranged between the movable plate and the bottom of the box body.

[0016] As a preferred solution of the indoor model test device for simulating non-viscous fill with limited width behind a wall described in the present invention, the driving mechanism includes a motor and a push rod, and the start and stop of the motor are controlled by an electronic control device.

[0017] The beneficial effects of the present invention are as follows: the present invention fills sand in a box, simulates the soil pressure of the limited width non-cohesive fill behind the wall by means of the first baffle and the second baffle, and causes the second baffle to move toward the first baffle by means of a driving mechanism to cause the sand to be squeezed, thereby simulating the change in pressure, and effectively solves the problem that the traditional test system cannot accurately simulate the failure mode of the limited width non-cohesive fill behind the wall. The soil pressure based on dynamic changes can better reflect the pressure conditions of the natural slope in actual engineering or the exterior wall structure of an existing building. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 FIG. 4 is a front view of a test device in one embodiment.

[0019] Figure 2 A system structure diagram in one implementation manner.

[0020] Figure 3 1 is a top view of a test device in one embodiment.

[0021] Figure 4 Schematic diagram of various modes in which the second stopper is pushed in one embodiment. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "implementation method" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0025] like Figure 1~Figure 4 As shown, in one embodiment of the present invention, an indoor model test device for simulating limited width cohesiveless fill behind a wall is provided. It should be noted that "limited width" means that in the model test, the width of the fill area is limited to a certain range, and this range is determined comprehensively based on factors such as the test purpose, test conditions, and similarity ratio.

[0026] Finite width can affect the mechanical behavior and deformation characteristics of fill. Therefore, when designing and conducting tests, this factor needs to be fully considered and corresponding measures need to be taken to ensure the accuracy and reliability of the test results.

[0027] "Non-cohesion fill" means that the fill material itself is not cohesive, that is, there is no cohesion between the particles. This type of fill usually includes sand, gravel, etc. Their main feature is that the overall stability is maintained mainly through friction and embedding force between particles.

[0028] The density of cohesionless fill has an important influence on its engineering properties. The greater the density, the greater the strength of the soil and the more stable its deformation characteristics.

[0029] Based on the above disclosure, the indoor model test device for simulating the limited width of cohesive-free fill behind the wall provided in this embodiment refers to a test device for simulating the mechanical behavior and deformation characteristics of cohesive-free fill within a limited width behind the wall under indoor conditions. The device can simulate the fill scene in actual engineering, and study the deformation and failure characteristics of the fill when subjected to external forces by controlling parameters such as the density and loading method of the fill.

[0030] Specifically, the test device includes a box body 100 , a first stopper 200 , a second stopper 400 and a monitoring device 600 .

[0031] The limited width may be understood as the distance between the first stopper 200 and the second stopper 400 .

[0032] The box 100 has a storage space 101. The box 100 has six surfaces, including front and back surfaces, left and right surfaces, and upper and lower surfaces. The front of the box 100 is a plexiglass plate, the back of the box 100 is a stainless steel plate, and the bottom of the box 100 is also a stainless steel plate. The box 100 is connected as a whole by a frame structure.

[0033] The bottom surface of the box body 100 has a sand discharge valve port with an aperture of 0.05 m. The top surface of the box body 100 has a sand inlet valve port.

[0034] A bearing platform 102 is provided at the bottom of the box 100. The bearing platform 102 is a stainless steel plate structure with a height of 0.4 m.

[0035] The first stopper 200 is disposed in the accommodating space 101 and is slidably connected to the bottom of the accommodating space 101, and a first pressure sensor A is disposed on the first stopper 200; the sliding connection of the first stopper 200 means that the first stopper 200 is connected to the bottom of the accommodating space 101 by means of a slide rail, and it can slide close to one side of the second stopper 400 or slide away from one side of the second stopper 400. Specifically, when the first stopper 200 moves to a specified position, the slide rail is fixed so that the first stopper 200 is fixed at the position.

[0036] The second stopper 400 is arranged opposite to the first stopper 200 and is connected to one side of the box body 100 through a driving mechanism 500. A displacement sensor B and a second pressure sensor C are arranged on the second stopper 400. The driving mechanism 500 can drive the second stopper 400 to approach the first stopper 200 or move away from the first stopper 200. The displacement sensor B is used to detect the moving distance of the second stopper 400.

[0037] In actual operation, the driving mechanism 500 drives the second stopper 400 to move so as to squeeze the sand and simulate pressure changes.

[0038] The monitoring device 600 includes a data acquisition module 601 and a data analysis module 602. The data acquisition module 601 is electrically connected to the data analysis module 602, and the data acquisition module 601 is also electrically connected to the first pressure sensor A, the displacement sensor B and the second pressure sensor C; the data acquisition module 601 is used to obtain the data collected by the first pressure sensor A, the displacement sensor B and the second pressure sensor C, and the data analysis module 602 is used to analyze the data collected by the first pressure sensor A, the displacement sensor B and the second pressure sensor C.

[0039] Among them, the accommodating space 101 in the box body 100 is used to fill sand and soil. After the sand and soil are stationary, the driving mechanism 500 is controlled to displace the second stopper 400 to squeeze the sand and soil. The monitoring device 600 obtains the data collected by the first pressure sensor A, the displacement sensor B and the second pressure sensor C through the data acquisition module 601 to analyze and obtain the changes in the sand and soil pressure acting on the first stopper 200 and the second stopper 400.

[0040] The data analysis module 602 can calculate the change in pressure on the first stopper 200 and the second stopper 400. The monitoring device 600 includes a host computer for displaying the data collected by the first pressure sensor A, the displacement sensor B and the second pressure sensor C and the pressure change data.

[0041] Specifically, grooves are provided on the first stopper 200 and the second stopper 400 to facilitate installation of the first pressure sensor A and the second pressure sensor C. In one embodiment, the diameter of the first pressure sensor A is 36 mm, the range is 0-10 kPa, and the accuracy is 0.05%. The diameter of the second pressure sensor C is 24 mm, the range is 0-10 kPa, and the accuracy is 0.05%.

[0042] There are multiple displacement sensors B, which are located at heights of 0.45 m, 0.65 m, and 1 m respectively.

[0043] The monitoring device 600 further includes a camera module 603 , which is used to capture images at set intervals when the second stopper 400 moves to squeeze the sand and transmit the images to the data analysis module 602 .

[0044] The camera module 603 can be a high-precision digital camera. The camera module 603 is located in front of the box 100, and the position is fixed by fixing the tripod. During the test, a fixed time interval shooting mode is set to continuously shoot the deformation of the soil during the test. In order to ensure the uniformity and stability of the shooting light source during the test, two fog lights and two LED fill lights are symmetrically arranged in front of the box 100.

[0045] The camera module 603 can upload the captured photos or videos to the host computer through the data acquisition module 601. The whole process of the limited fill deformation and failure of the second stopper 400 in different displacement modes can be observed and recorded.

[0046] In one embodiment, the first stopper 200 includes a bottom plate 201 and a rotating plate 202 . The rotating plate 202 is located at one end of the bottom plate 201 and is rotatably connected to the bottom plate 201 via a rotating bearing 203 . The bottom plate 201 is slidably connected to the bottom of the box body 100 .

[0047] For example, when the bottom plate 201 and the rotating plate 202 are at an angle of 90 degrees, they are in an L shape. In other embodiments, different tilt angles can be set by rotating the bearing 203, so that the rotating plate 202 can simulate fixed walls and building structures at various angles.

[0048] Wool strips are arranged on both sides of the rotating plate 202 facing the front and back of the box body 100 to prevent sand from leaking out of the box body 100.

[0049] The bottom plate 201 is slidably connected to the bottom of the box body 100 , and specifically, a first slide rail 204 is provided on the bottom plate 201 , and the bottom plate 201 is threadedly connected to the bottom of the box body 100 by a first bolt 205 passing through the first slide rail 204 to be fixed.

[0050] The first bolt 205 passes through the first slide rail 204 and is fixedly connected to the box body 100 so as to press the bottom plate 201 inside the box body 100 to prevent the bottom plate 201 from further moving.

[0051] Wool strips are respectively pasted on both ends of the first bolt 205 to prevent soil leakage.

[0052] When the first bolt 205 is loosened, the bottom plate 201 can slide. The first bolt 205 is always connected to the box body 100, so that the bottom plate 201 can only move horizontally. The first bolt 205 is tightened to press the bottom plate 201, and the bottom plate 201 can move when it is loosened.

[0053] The base plate 201 is provided with a second slide rail 206, and the rotating plate 202 is provided with a third slide rail 207. The second slide rail 206 and the third slide rail 207 are directly connected through a support plate 208. One end of the support plate 208 is connected to the second slide rail 206 through a second bolt 208-1, and the other end of the support plate 208 is connected to the third slide rail 207 through a third bolt 208-2. The angle between the rotating plate 202 and the base plate 201 is fixed by the connection of the support plate 208.

[0054] The support plate 208 can support the rotating plate 202 so that the rotating plate 202 and the bottom plate 201 are fixed at a certain angle to prevent the rotating plate 202 from being crushed by sand and soil.

[0055] Both ends of the support plate 208 can slide on the second slide rail 206 and the third slide rail 207, so as to facilitate the adjustment of the angle, and then the support plate 208 is fixed by the second bolt 208-1 and the third bolt 208-2.

[0056] In one embodiment, the second stopper 400 includes a movable plate 401 , which is disposed opposite to the rotating plate 202 , and a side of the movable plate 401 facing away from the rotating plate 202 is connected to a driving mechanism 500 , and the driving mechanism 500 is used to drive the movable plate 401 to approach or move away from the rotating plate 202 .

[0057] Wool strips are also provided on one side of the movable plate 401 corresponding to the front and rear surfaces of the box body 100 .

[0058] Furthermore, multiple displacement sensors B are arranged along the height direction of the box body 100. The displacement sensors B are arranged in the box body 100 through a support rod B-1. The support rod B-1 connects the top wall and the bottom wall of the box body 100. The displacement sensor B is installed on the support rod B-1. The displacement sensor B has a top rod, which is connected to the movable plate 401. The movement of the movable plate 401 drives the top rod to move to detect the displacement of the movable plate 401.

[0059] The support rod B-1 is arranged vertically, and the displacement sensor B is arranged along the vertical direction of the support rod B-1.

[0060] In one embodiment, a cushion block 103 is disposed between the movable plate 401 and the bottom of the box 100 , so as to eliminate the boundary effect between the test fill and the bottom plate of the box 100 .

[0061] In one embodiment, the driving mechanism 500 includes a motor 501 and a push rod 502, and the start and stop of the motor 501 are controlled by an electronic control device.

[0062] Specifically, two groups of drive mechanisms 500 can be set at the upper and lower positions. The electric control device can control the forward and backward movement of the motor 501. The motor near the top of the box 100 is the first motor, and the motor near the bottom of the box is the second motor. The electric control box button has three modes, which can change the movement mode of the retaining wall, namely, the first motor drive, the second motor drive, and the first motor and the second motor drive together. Figure 4 As shown, the rotation frequency of the motor 501 (the first motor and the second motor) can be adjusted to simulate the combined motion mode. The electric control box button has three gears: forward, stop and backward. Backward is to deviate from the limited fill direction, simulating the active destruction state; forward is to approach the limited fill direction, simulating the passive destruction state.

[0063] The specific operation of the test device is as follows: (1) Push the first stopper 200 to the designated position in the box 100, adjust the bottom plate 201 and the rotating plate 202, and fix them with the second bolt 208-1 and the third bolt 208-2. A certain weight iron block may also be placed on the bottom plate 201 to prevent the stopper from moving.

[0064] (2) Align the bottom edge of the movable plate 401 with the edge of the pad 103, and use a level to measure the flatness of the movable plate 401 to ensure that the movable plate 401 is vertical. If a non-vertical retaining wall is tested, use a protractor to measure the inclination angle.

[0065] (3) Install the first pressure sensor A and the second pressure sensor C, fill the groove gap with glass glue, and finally insert the fixing pin.

[0066] (4) Lay out displacement sensor B, fix it with bolts, and keep the displacement rod horizontal.

[0067] (5) Lead out the data lines of the sensors, connect each sensor to the connection channel of the data acquisition module 601, the data acquisition module 601 is electrically connected to the data analysis module 602, and then connected to the host computer.

[0068] (6) Use artificial rain method to fill sand and soil with a filling height of 1 m. Level the soil surface and let it stand for one day to make the fill soil dense under its own weight.

[0069] (7) Build a tripod to place the camera module 603, adjust the shooting angle and screen size, set the interval shooting time and total shooting time. Place the camera module 603 at a fixed point and arrange the fill lights symmetrically on both sides, coordinate the light source and shooting effect, and ensure that the captured image meets the test effect.

[0070] (8) According to the displacement mode required by the test, the electronic control device is adjusted to set the working mode of the motor 501. In order to prevent interference from other light sources and thus affect the shooting effect, the test environment is selected to be indoors with an opaque umbrella shed.

[0071] (9) Turn on the power of the data acquisition card and the data acquisition software, and wait for the acquisition signal to remain stable before conducting the test.

[0072] (10) After turning on the camera to take a picture, the electronic control device is operated to make the motor 501 start working and the moving plate 401 moves slowly.

[0073] (11) After the moving plate 401 moves to the test displacement, the motor 501 is stopped, and then the camera is stopped from taking pictures. After the data signal is stable, the data acquisition module 601 is turned off.

[0074] (12) Place a sand bucket under the bottom bearing platform 102, loosen the bolts, return the first stopper 200 to its original position, and unscrew the sand unloading cover to unload the sand.

[0075] (13) Control the change of single variable and repeat the above operation.

[0076] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, changes in orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete element may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to an alternative embodiment. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0077] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention).

[0078] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An indoor model test device for simulating non-cohesive fill with limited width behind a wall, characterized by: include, A box body (100), wherein the box body (100) has a containing space (101); A first stopper (200) is arranged in the accommodating space (101) and is slidably connected to the bottom of the accommodating space (101), wherein a first pressure sensor (A) is arranged on the first stopper (200); a second stopper (400) arranged opposite to the first stopper (200) and connected to a side portion of the box body (100) via a driving mechanism (500), wherein a displacement sensor (B) and a second pressure sensor (C) are arranged on the second stopper (400); A monitoring device (600) comprising a data acquisition module (601) and a data analysis module (602), wherein the data acquisition module (601) is electrically connected to the data analysis module (602), and the data acquisition module (601) is also electrically connected to a first pressure sensor (A), a displacement sensor (B), and a second pressure sensor (C); The accommodating space (101) in the box (100) is used to fill sand and soil. After the sand and soil are left to stand, the driving mechanism (500) is controlled to displace the second stopper (400) to squeeze the sand and soil. The monitoring device (600) acquires data collected by the first pressure sensor (A), the displacement sensor (B) and the second pressure sensor (C) through the data acquisition module (601) to analyze and obtain the change in the sand and soil pressure acting on the first stopper (200) and the second stopper (400).

2. The indoor model test device for simulating non-cohesive fill with limited width behind a wall as claimed in claim 1, characterized in that: The monitoring device (600) further comprises a camera module (603), wherein the camera module (603) is used to capture images at set intervals when the second stopper (400) is displaced to squeeze the sand and soil, and transmit the images to the data analysis module (602).

3. The indoor model test device for simulating non-cohesive fill with limited width behind a wall as claimed in claim 1, characterized in that: A bearing platform (102) is provided at the bottom of the box body (100).

4. The indoor model test device for simulating non-cohesive fill with limited width behind a wall as claimed in claim 1, characterized in that: The first stopper (200) comprises a bottom plate (201) and a rotating plate (202); the rotating plate (202) is located at one end of the bottom plate (201) and is rotatably connected to the bottom plate (201) via a rotating bearing (203); and the bottom plate (201) is slidably connected to the bottom of the box body (100).

5. The indoor model test device for simulating non-cohesive fill with limited width behind a wall as claimed in claim 4, characterized in that: A first slide rail (204) is provided on the bottom plate (201), and the bottom plate (201) is threadedly connected to the bottom of the box body (100) by means of a first bolt (205) passing through the first slide rail (204) for fixation.

6. The indoor model test device for simulating non-cohesive fill with limited width behind a wall as claimed in claim 4, characterized in that: The bottom plate (201) is provided with a second slide rail (206), the rotating plate (202) is provided with a third slide rail (207), the second slide rail (206) and the third slide rail (207) are directly connected via a support plate (208), one end of the support plate (208) is connected to the second slide rail (206) via a second bolt (208-1), and the other end of the support plate (208) is connected to the third slide rail (207) via a third bolt (208-2); The angle between the rotating plate (202) and the bottom plate (201) is fixed by connection with the supporting plate (208).

7. The indoor model test device for simulating limited width non-cohesive fill behind a wall as claimed in claim 4, characterized in that: The second blocking member (400) comprises a movable plate (401), the movable plate (401) being arranged opposite to the rotating plate (202), and a side of the movable plate (401) facing away from the rotating plate (202) being connected to a driving mechanism (500), the driving mechanism (500) being used to drive the movable plate (401) to move closer to or away from the rotating plate (202).

8. The indoor model test device for simulating non-cohesive fill with limited width behind a wall as claimed in claim 7, characterized in that: A plurality of displacement sensors (B) are arranged along the height direction of the box body (100); the displacement sensors (B) are arranged in the box body (100) via a support rod (B-1); the support rod (B-1) is connected to the top wall and the bottom wall of the box body (100); the displacement sensor (B) is mounted on the support rod (B-1); the displacement sensor (B) has a top rod, the top rod is connected to the moving plate (401); the movement of the moving plate (401) drives the top rod to move, so as to detect the displacement of the moving plate (401).

9. The indoor model test device for simulating non-cohesive fill with limited width behind a wall as claimed in claim 7, characterized in that: A cushion block (103) is provided between the movable plate (401) and the bottom of the box body (100).

10. The indoor model test device for simulating non-cohesive fill with limited width behind a wall as claimed in claim 1, characterized in that: The driving mechanism (500) comprises a motor (501) and a push rod (502), and the start and stop of the motor (501) are controlled by an electric control device.

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