Testing device for limited-width sandy soil model close to rear part of wall body

Abstract

The utility model relates to the technical field of geotechnical engineering, in particular to a limited-width sand model test device close to the rear of a wall body, which comprises a model box, a movable baffle is movably connected in the model box, and a driving unit for driving the movable baffle to linearly move is mounted in the model box; a movable baffle is arranged on the inner side of the model box, a fixed baffle is further arranged on the inner side of the model box, the fixed baffle and the movable baffle are oppositely arranged, a support is installed in the model box, and an adjusting mechanism is installed on the support. The fixed baffle is used for simulating a natural slope surface in actual engineering or an existing building outer wall structure, the inclination angle of the fixed baffle can be adaptively adjusted according to a to-be-simulated actual environment, so that the applicability of the whole device is guaranteed, meanwhile, the movable baffle adopts a linear movement adjusting mode, and the adjustment is convenient. In this way, adaptive change control over the width is completed, and the sandy soil pressure conditions of different limited widths are simulated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a geotechnical engineering technical field especially close to a kind of limited width sand model test device of wall back. BACKGROUND

[0002] With the rapid development of infrastructure construction, the construction of new structures adjacent to existing structures is increasing, leading to the frequent occurrence of limited width fill behind retaining walls. In the case of limited width fill, the soil is subjected to the combined action of the constraints of the two side boundaries and the friction of the wall-soil interface, and its failure mode and stress state are different from the traditional semi-infinite soil theory. Existing research shows that when the width of the fill behind the wall is insufficient, the soil is significantly affected by the boundary constraints and friction of the two side interfaces during deformation and failure, resulting in a significantly different development trend of the failure sliding surface and soil pressure than the case of "semi-infinite" fill behind the wall.

[0003] However, the existing retaining wall test device cannot effectively simulate different retaining wall displacement modes and various working conditions, resulting in limited application range. In actual engineering applications, this limitation makes it difficult for engineers to accurately predict the deformation and failure mode of limited width fill and the distribution characteristics of soil pressure, thereby affecting the safety and stability of the structure.

[0004] Therefore, in order to solve this problem, we propose a limited width sand model test device adjacent to the back of the wall. SUMMARY

[0005] The utility model aims at solving the shortcomings of the prior art that the existing retaining wall test device cannot effectively simulate different retaining wall displacement modes and various working conditions, and proposes a limited width sand model test device adjacent to the back of the wall.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] A limited width sand model test device adjacent to the back of the wall is designed, which includes a model box, a movable baffle is movably connected inside the model box, and a driving unit is installed to drive the linear movement of the movable baffle.

[0008] A fixed baffle is also provided on the inside of the model box, the fixed baffle is oppositely arranged with the movable baffle, a bracket is installed inside the model box, an adjusting mechanism is installed on the bracket, and the adjusting mechanism is used to adjust the inclination angle of the fixed baffle.

[0009] Further, the driving unit includes a lead screw motor fixed inside the model box through a bracket, and the shaft end of the lead screw motor is rotatably connected with the movable baffle.

[0010] Two are arranged at intervals on the screw motor.

[0011] Further, a displacement sensor is fixedly installed on the support, and a rod end of the displacement sensor is connected with the movable baffle.

[0012] Further, a pressure sensor is arranged on opposite surfaces of the movable baffle and the fixed baffle, and the displacement sensor and the pressure sensor are connected with an external control unit.

[0013] Further, the adjusting mechanism comprises a first connecting rod rotatably connected to the support, a second connecting rod coaxially rotatable on the first connecting rod, and a third connecting rod rotatably connected to a tail end of the second connecting rod.

[0014] Further, the first connecting rod and the third connecting rod are both pin-connected to the support.

[0015] Further, a rotating shaft is rotatably connected to the support, the rotating shaft is rotatably connected to the first connecting rod and fixedly connected to the second connecting rod, an end of the rotating shaft is fixedly connected with a gear, and a plug rod is movably inserted into a side surface of the support through a spring, and a bottom end of the plug rod is clamped with the gear.

[0016] Further, a pad plate is arranged at the bottom of the movable baffle, and sealing strips are arranged at two sides of the fixed baffle.

[0017] Further, a transparent panel is arranged at the front end of the model box, and a steel plate is arranged at the back end of the model box.

[0018] The sand soil model test device with limited width behind the adjacent wall has the beneficial effects that: in the embodiment, the fixed baffle with adjustable inclination angle is adopted, the fixed baffle is used for simulating natural slope surfaces or outer wall structures of existing buildings in actual engineering, the inclination angle of the fixed baffle can be adaptively adjusted according to the actual environment to be simulated, so as to ensure the applicability of the whole device, and the movable baffle adopts a linear moving adjusting mode, so as to adaptively change and control the width to simulate the sand soil pressure conditions of different limited widths. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a structural schematic view of the utility model;

[0020] Fig. 2 It is a structural schematic view of the adjusting mechanism of the utility model;

[0021] Fig. 3 It is a structural schematic view of the rotating shaft of the utility model.

[0022] In the figure: 1, model box; 11, sand valve; 2, moving baffle; 21, pressure sensor; 22, backing plate; 3, driving unit; 31, screw motor; 32, displacement sensor; 4, fixed baffle; 41, sealing strip; 5, support; 51, rotating shaft; 52, gear; 53, spring; 54, plug rod; 6, adjusting mechanism; 61, first connecting rod; 62, second connecting rod; 63, third connecting rod. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0024] Reference Figs. 1-3 For an embodiment of the utility model, it discloses a kind of adjacent wall body rear limited width sand model test device, specifically the test device includes model box 1, the model box 1 is overall rectangular structure, moving baffle 2 is movably connected in the inside of the model box 1, and driving unit 3 is installed to drive the linear movement of the moving baffle 2;

[0025] Fixed baffle 4 is also provided in the inside of the model box 1, the fixed baffle 4 is oppositely arranged with the moving baffle 2, and support 5 is installed in the inside of the model box 1, it needs to be explained that the support 5 in the embodiment is fixed in the inside of the model box 1 by bolt, in addition, a plurality of threaded holes can be provided in the inside of model box 1, to realize the lateral position adjustment of support 5, to meet the simulation test demand of different positions, adjusting mechanism 6 is installed on the support 5, and the adjusting mechanism 6 is used to adjust the inclination angle of the fixed baffle 4.

[0026] Of course, in order to avoid the test sand in the interior to be discharged, sand valve 11 is also provided in the interior of the model box 1 in the embodiment, so as to discharge the sand in the interior of the model box 1 after test, as preferred, the sand in the embodiment is Fujian Pingtan standard sand, which is filled between the moving baffle 2 and the fixed baffle 4.

[0027] That is to say, the fixed baffle 4 of inclination angle adjustment is used in the embodiment, and the fixed baffle 4 is used to simulate natural slope or existing building outer wall structure in actual engineering, and the inclination angle of the fixed baffle 4 can be adjusted adaptively according to the actual environment to be simulated, so as to ensure the applicability of the whole device.

[0028] In some embodiments, the driving unit 3 in the utility model includes screw motor 31 fixed in the interior of the model box 1 by support, and the shaft end of the screw motor 31 is rotatably connected with the moving baffle 2.

[0029] Two of the screw rod motors 31 are arranged at intervals, that is, two screw rod motors 31 are used to control the linear movement of the whole movable baffle 2 in the embodiment, so as to complete the adaptive control of the width and simulate the sand pressure in different limited widths.

[0030] It should be noted that the displacement sensor 32 is also fixedly installed on the support in the embodiment, the rod end of the displacement sensor 32 is connected with the movable baffle 2, and the displacement sensor 32 arranged is used to detect the moving distance of the movable baffle 2, so as to improve the accuracy of the test data.

[0031] In addition, the opposite surfaces of the movable baffle 2 and the fixed baffle 4 are provided with pressure sensors 21 in the embodiment, the displacement sensor 32 and the pressure sensor 21 are connected with an external control unit, specifically, the control unit in the embodiment can be set as a data acquisition instrument, the transmission lines of the pressure sensor 21 and the displacement sensor 32 are connected with the data acquisition instrument and a direct current stabilized power supply, and the data acquisition instrument is connected to a computer through wires for data acquisition; a fixed tripod is arranged in front of the glass plate of the model box 1 to fix a high-precision digital camera, a fixed time interval shooting mode is set during the test process, the deformation of the soil body during the test process is continuously shot, two fog lamps and two LED fill light lamps are arranged in front of the model box 1 to ensure the uniformity and stability of the shooting light source during the test process.

[0032] On the basis of the above embodiment, the adjusting mechanism 6 in the embodiment comprises a first connecting rod 61 rotatably connected to the support 5, a second connecting rod 62 coaxially rotatable on the first connecting rod 61, and a third connecting rod 63 rotatably connected to the tail end of the second connecting rod 62.

[0033] The other end of the first connecting rod 61 and the third connecting rod 63 is both pinned to the.

[0034] That is, the first connecting rod 61, the second connecting rod 62, the third connecting rod 63 and the fixed baffle 4 form a parallelogram structure in the embodiment, and the rotation of the second connecting rod 62 can realize the adjustment of the angle of the whole fixed baffle 4 to meet the slope requirement in different simulated environments.

[0035] On the basis of the above embodiment, in order to fix the angle of the second connecting rod 62 after rotation, a rotating shaft 51 is rotatably connected to the support 5 in the embodiment, the rotating shaft 51 is rotatably connected with the first connecting rod 61 and fixedly connected with the second connecting rod 62, the end of the rotating shaft 51 is fixedly connected with a gear 52, the side surface of the support 5 is movably inserted with a plug rod 54 through a spring 53, and the bottom end of the plug rod 54 is clamped with the gear 52.

[0036] Specifically, in the embodiment, a sliding seat is fixedly installed at the side of the support 5, the inserting rod 54 is movably inserted with the sliding seat, the spring 53 is fixedly connected between the sliding seat and the inserting rod 54, when the second connecting rod 62 rotates, the second connecting rod 62 drives the rotating shaft 51 to rotate, the inserting rod 54 and the gear 52 are mutually clamped to fix the position of the second connecting rod 62, and then the current angle of the fixed baffle 4 is locked and fixed.

[0037] Specifically, in the embodiment, in order to eliminate the boundary effect of the test filling and the bottom plate of the model box, the bottom of the movable baffle 2 is provided with a pad plate 22, the pad plate 22 can be a rubber pad, the both sides of the fixed baffle 4 are provided with sealing strips 41, the sealing strips 41 are used to prevent the sand from leaking out when the angle is adjusted, and of course, the bottom of the fixed baffle 4 can also be provided with a sealing structure, which is a routine means for the person skilled in the art, and will not be described here.

[0038] It should be noted that in the embodiment, the front end of the model box 1 is provided with a transparent panel, the transparent panel is provided as a organic glass plate, and the back end is provided as a steel plate.

[0039] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A model test device for a limited width sand model test adjacent to the rear of a wall, comprising a model box (1), characterized in that: A movable baffle (2) is movably connected inside the model box (1), and a driving unit (3) for driving the movable baffle (2) to move linearly is arranged on the model box (1); A fixed baffle (4) is arranged on the inside of the model box (1), and the fixed baffle (4) is arranged opposite to the movable baffle (2); a support (5) is arranged inside the model box (1), and an adjusting mechanism (6) is arranged on the support (5), and the adjusting mechanism (6) is used for adjusting the inclination angle of the fixed baffle (4).

2. The apparatus according to claim 1, wherein: The driving unit (3) comprises a lead screw motor (31) fixed on the inside of the model box (1) through a support, and the shaft end of the lead screw motor (31) is rotatably connected with the movable baffle (2). Two lead screw motors (31) are arranged at intervals.

3. The apparatus according to claim 1, wherein the width of the sand model is limited. A displacement sensor (32) is further fixedly arranged on the support, and the rod end of the displacement sensor (32) is connected with the movable baffle (2).

4. The apparatus according to claim 3, wherein: Pressure sensors (21) are arranged on the opposite surfaces of the movable baffle (2) and the fixed baffle (4), and the displacement sensor (32) and the pressure sensors (21) are connected with an external control unit.

5. The apparatus according to claim 1, wherein the width of the sand model is limited. The adjusting mechanism (6) comprises a first connecting rod (61) rotatably connected with the support (5), a second connecting rod (62) coaxially rotatably arranged on the first connecting rod (61), and a third connecting rod (63) rotatably connected with the tail end of the second connecting rod (62). The other ends of the first connecting rod (61) and the third connecting rod (63) are both pinned to the support (5).

6. The apparatus according to claim 5, wherein: A rotating shaft (51) is rotatably connected with the support (5), the rotating shaft (51) is rotatably connected with the first connecting rod (61) and fixedly connected with the second connecting rod (62), the end of the rotating shaft (51) is fixedly connected with a gear (52), the side of the support (5) is movably inserted with an insertion rod (54) through a spring (53), and the bottom end of the insertion rod (54) is clamped with the gear (52).

7. The apparatus according to claim 1, wherein the width of the sand model is limited. A pad (22) is arranged on the bottom of the movable baffle (2), and sealing strips (41) are arranged on the two sides of the fixed baffle (4).

8. The apparatus according to any one of claims 1 to 7, wherein: the width of the sand model is limited to a width of 1.5 m or less. A transparent panel is arranged on the front end of the model box (1), and a steel plate is arranged on the back end of the model box (1).

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