Test device suitable for simulation loading of cross-fault deep tunnel

Abstract

The utility model discloses a test device suitable for simulation loading of a cross-fault deep tunnel, which comprises a bottom plate, a first slide rail, a second slide rail, a group of model boxes and a telescopic connecting belt arranged between the model boxes, and jacks are slidably connected onto tracks of the first slide rail and the second slide rail. The model box comprises four staggered first pressure plates and second pressure plates arranged on the end faces of one sides of the first pressure plates, the outer side end faces of the first pressure plates are fixedly connected with the telescopic ends of the jacks on the first sliding rails, and the outer side end faces of the second pressure plates are fixedly connected with the telescopic ends of the jacks on the second sliding rails; the first pressure plates are arranged in a staggered mode, true three-direction ground stress loading can be kept in the test process, the telescopic connecting belts are arranged between the model boxes, shearing movement in any direction between the two model boxes is achieved, forward or reverse or strike-slip deep-buried fault tunnel simulation loading is further achieved, and the accuracy of a tunnel simulation experiment is improved.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel construction technology, specifically a test device suitable for simulating loading in deep-buried tunnels across faults. Background Technology

[0002] Deep-buried tunnel construction projects often inevitably cross active fault zones, which adds considerable difficulty to tunnel construction. Due to various factors and objective conditions, it is difficult to directly observe the surrounding rock damage and movement patterns caused by fault activation. Therefore, at present, the main method is to simulate the impact of fault activation on tunnel structure and surrounding rock stress distribution by artificially setting test conditions. The test results can roughly reproduce the catastrophic evolution process and activation patterns of the fault.

[0003] However, existing test devices are concentrated in the field of normal and reverse faults dominated by stick-slip, and cannot realize the rheological simulation of tunnels on normal, reverse and strike-slip faults. In addition, the current test devices are only suitable for simulating loading of shallow tunnels across faults. This is because these devices do not consider the influence of in-situ stress during fault displacement. In particular, for deep tunnels across faults, which are in a state of extremely high true triaxial stress, using in-situ stress distortion model devices to simulate them will increase the unreliability of the test results. Utility Model Content

[0004] The purpose of this invention is to provide a test device suitable for simulating loading in deep-buried tunnels across faults, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a test device suitable for simulating loading of deep-buried tunnels across faults, comprising a base plate, a first slide rail, a second slide rail, two model boxes, and a telescopic connecting belt disposed between the model boxes. The first and second slide rails are fixedly connected to the base plate, and jacks are slidably connected to the tracks of the first and second slide rails. The model box comprises four staggered first pressure plates and a second pressure plate disposed on one end face of the first pressure plate. The outer end face of the first pressure plate is fixedly connected to the telescopic end of the jack on the first slide rail, and the outer end face of the second pressure plate is fixedly connected to the telescopic end of the jack on the second slide rail. Pressure sensors are disposed on the inner sides of the first and second pressure plates. The jacks are electro-hydraulic servo-controlled jacks, and the pressure sensors and jacks are electrically connected to the control system.

[0006] Preferably, the telescopic connecting strip is composed of multiple sliding units hinged end to end. The sliding unit includes a sliding buckle plate and a T-shaped connecting plate. The inner side of the sliding buckle plate is hollow and a track is provided on two corresponding surfaces of the sliding buckle plate. A ball bearing is rolled below the horizontal plate of the T-shaped connecting plate and the ball bearing is engaged with the track of the sliding buckle plate. The vertical plate of the T-shaped connecting plate passes through the sliding buckle plate and is hinged to the T-shaped connecting plate of another set of sliding units.

[0007] The telescopic connecting strip, which is set by the sliding buckle plate and the T-shaped connecting plate, can be made of high-strength materials, thus improving the service life of the device.

[0008] Furthermore, four telescopic connecting straps are provided, and the two opposite sides of the four telescopic connecting straps are respectively hinged to the opposite first pressure plates on the two model boxes.

[0009] The telescopic connecting belt corresponds to the first pressure plate. When simulating ground stress through the first pressure plate, the first pressure plate can drive the telescopic connecting belt to apply stress to the tunnel model inside the telescopic connecting belt, thereby improving the accuracy of the simulation experiment.

[0010] Furthermore, a caster wheel with a self-locking structure is provided under the base plate.

[0011] The ease of moving the device is improved by adding casters.

[0012] Preferably, the first and second slide rails are provided with rolling grooves, the plurality of jacks are respectively fixedly connected to the plurality of sliding blocks, the plurality of sliding blocks are hollow inside and are respectively sleeved on the first and second slide rails, the inner side of the sliding blocks is rotatably connected to electric rollers and the electric rollers are rotatably connected in the rolling grooves, and the surface of the electric rollers is provided with anti-slip material, and the electric rollers are connected to the control system through a circuit.

[0013] The stability of the jack during sliding is improved by connecting the first and second slide rails of the jack through a socket joint.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention uses a first pressure plate with a misaligned connection as the boundary of the model box, which can maintain true triaxial ground stress loading during the test, thus improving the accuracy of the simulation experiment of a deep-buried high-ground-stress tunnel crossing a strike-slip fault.

[0016] This invention enables shearing motion and ground stress loading in any direction between two model boxes by setting a telescopic connecting strip between them, thereby simulating loading of forward, reverse, or strike-slip deep-buried fault tunnels. At the same time, the number of sliding units of the telescopic connecting strip can be increased or decreased to simulate any fault thickness. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the test device for simulating loading of deep-buried tunnels across faults, provided in an embodiment of this utility model.

[0018] Figure 2 This is a schematic diagram of the model box structure provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the telescopic connecting belt structure provided in an embodiment of this utility model;

[0020] Figure 4 This is a schematic diagram of the sliding block structure provided in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the internal structure of the sliding block provided in an embodiment of the present invention;

[0022] In the diagram, 1-base plate, 2-first slide rail, 3-second slide rail, 4-model box, 5-telescopic connecting belt, 6-jack, 7-sliding block, 8-rolling groove, 11-universal wheel, 41-first pressure plate, 42-second pressure plate, 51-sliding unit, 52-hinge, 71-electric roller, 511-sliding buckle plate, 512-T-shaped connecting plate, 513-ball bearing. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-5 This utility model provides a technical solution: a test device suitable for simulating loading of deep buried tunnels across faults, including a base plate 1, a first slide rail 2, a second slide rail 3, two model boxes 4, and a telescopic connecting belt 5 set between the model boxes 4. A universal wheel 11 with a self-locking structure is set below the base plate 1. The first slide rail 2 and the second slide rail 3 are fixedly connected to the base plate 1, and jacks 6 are slidably connected on the tracks of the first slide rail 2 and the second slide rail 3. Specifically, the first slide rail 2 and the second slide rail 3 are provided with rolling grooves 8. Multiple jacks 6 are fixedly connected to multiple sliding blocks 7. The inner side of the multiple sliding blocks 7 is hollow and the sliding blocks 7 are respectively sleeved on the first slide rail 2 and the second slide rail 3. An electric roller 71 is rotatably connected to the inner side of the sliding block 7 and the electric roller 71 is slidably connected in the rolling groove 8. The surface of the electric roller 71 is provided with anti-slip material.

[0025] The model box 4 includes four staggered first pressure plates 41 and a second pressure plate 42 disposed on one side end face of the first pressure plate 41. The outer end face of the first pressure plate 41 is fixedly connected to the telescopic end of the jack 6 on the first slide rail 2. The outer end face of the second pressure plate 42 is fixedly connected to the telescopic end of the jack 6 on the second slide rail 3. Pressure sensors are disposed on the inner sides of the first pressure plate 41 and the second pressure plate 42. The jack 6 is an electro-hydraulic servo control type jack. The electric roller 71, pressure sensor, jack 6 and control system are electrically connected.

[0026] Four telescopic connecting straps 5 are provided, and two opposite sides of the four telescopic connecting straps 5 are respectively hinged to the corresponding first pressure plates 41 on the two model boxes 4. The telescopic connecting straps 5 are composed of multiple sliding units 51 hinged end to end. The sliding unit 51 includes a sliding buckle plate 511 and a T-shaped connecting plate 512. The inner side of the sliding buckle plate 511 is hollow and a track is provided on two corresponding surfaces of the sliding buckle plate 511. A ball bearing 513 is rolled below the horizontal plate of the T-shaped connecting plate 512 and the ball bearing 513 is engaged on the track of the sliding buckle plate 511. The vertical plate of the T-shaped connecting plate 512 passes through the sliding buckle plate 511 and is hinged to the T-shaped connecting plate 512 of another set of sliding units through a hinge 52.

[0027] In the specific implementation process, before the model test, the prototype project needs to be generalized according to the research purpose; the specific geological conditions of the rock and soil mass need to be fully understood, including the thickness of the strata, lithology, distribution of structural surfaces, fault width and dip angle, etc. Then, according to the general situation of the prototype project and the geometric dimensions of the model box, an appropriate similarity ratio is selected for the test design. Based on the tunnel burial depth and the on-site ground stress test, the magnitude of the ground stress to be applied during the test is determined. Finally, the experimental model is filled inside the model box 4. The control system controls the jack 6 to apply pressure to the model to simulate the ground stress of the actual tunnel. During the test, the control system drives the electric roller 71 on the sliding block 7 connected to one of the model boxes 4 to rotate, so that the sliding block 7 slides along the first slide rail 2 or the second slide rail 3, thereby causing tensile and shear deformation between the two model boxes 4, and finally realizing the simulated loading of the tunnel across the strike-slip fault.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test device suitable for simulating loading in deep-buried tunnels across fault lines, characterized in that: The system includes a base plate, a first slide rail, a second slide rail, two model boxes, and a telescopic connecting belt between the model boxes. The first and second slide rails are fixedly connected to the base plate, and jacks are slidably connected to the tracks of the first and second slide rails. Each model box includes four staggered first pressure plates and a second pressure plate located on one side of the first pressure plate. The outer end face of the first pressure plate is fixedly connected to the telescopic end of the jack on the first slide rail, and the outer end face of the second pressure plate is fixedly connected to the telescopic end of the jack on the second slide rail. Pressure sensors are provided on the inner sides of the first and second pressure plates. The jacks are electro-hydraulic servo-controlled jacks, and the pressure sensors and jacks are electrically connected to the control system.

2. The test apparatus for simulating loading of deep-buried tunnels across faults according to claim 1, characterized in that: The telescopic connecting belt is composed of multiple sliding units hinged end to end. Each sliding unit includes a sliding buckle plate and a T-shaped connecting plate. The inner side of the sliding buckle plate is hollow and a track is provided on two corresponding surfaces of the sliding buckle plate. A ball bearing is rolled below the horizontal plate of the T-shaped connecting plate and the ball bearing is engaged with the track of the sliding buckle plate. The vertical plate of the T-shaped connecting plate passes through the sliding buckle plate and is hinged to the vertical plate of the T-shaped connecting plate of another set of sliding units.

3. The test apparatus for simulating loading of deep-buried tunnels across faults according to claim 1, characterized in that: The telescopic connecting straps are provided in four sections, and the two opposite sides of the four telescopic connecting straps are respectively hinged to the first pressure plates on the two model boxes.

4. The test apparatus for simulating loading of deep-buried tunnels across faults according to claim 1, characterized in that: The base plate is equipped with casters with a self-locking structure.

5. The test apparatus for simulating loading of deep-buried tunnels across faults according to claim 1, characterized in that: The first and second slide rails are provided with rolling grooves. The multiple jacks are respectively fixedly connected to the multiple sliding blocks. The sliding blocks are hollow inside and are respectively sleeved on the first and second slide rails. The inner side of the sliding block is rotatably connected to an electric roller, which is rolled in the rolling groove. The surface of the electric roller is provided with anti-slip material. The electric roller is connected to the control system through a circuit.

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