A double-arch tunnel testing device for simulating normal fault dislocation

Abstract

The utility model discloses a kind of double-arch tunnel test devices simulating normal fault dislocation, belong to tunnel anti-seismic technical field, including left half box, right half box, left arch tunnel, right arch tunnel, the left half box, right half box side is provided with sliding surface, the left half box outside is provided with base, the base side is connected with loading device, the loading device is fixedly connected in base inner wall;The utility model is opened in fixed box body with the first installation hole similar to the appearance of double-arch tunnel, can carry out test to double-arch tunnel, by setting movable left half box fixed right half box sliding surface, and by longitudinal pushing to left half box, the longitudinal dislocation of double-arch tunnel in crossing normal fault can be simulated, to facilitate the simulation test for double arch or continuous supply, more widely.

Description

Technical Field

[0001] This utility model relates to the field of tunnel seismic resistance technology, and in particular to a test device for simulating normal fault displacement in a double-arch tunnel. Background Technology

[0002] With the rapid development of urban rail transit, subway systems are being widely deployed and constructed in major cities. In this process, complex engineering problems inevitably arise from crossing active fault zones. The existence of active fault zones poses a severe challenge to the stability and safety of engineering structures such as subway tunnels. Therefore, in-depth research into the impact mechanism of fault zone slippage on engineering structures, providing a solid scientific basis for engineering design and construction, has become an urgent task. Stick-slip slippage of active faults, as a geological hazard phenomenon with significant regional characteristics, manifests as sudden large deformation displacements of the upper and lower walls of the fault. During this process, the tunnel lining structure in the strata is constrained by the relative displacement of the soil on both sides of the fault, resulting in additional stress and deformation. When the slippage displacement is too large, the lining will be subjected to a combination of tensile, compressive, shear, torsional, and bending mechanical forces, which may lead to cracking, yielding, or even failure of the lining, thereby endangering the normal operation of tunnels and other engineering projects. Studies have shown that the types of seismic damage to arch tunnels crossing active fault zones are diverse, mainly including heave and misalignment of the tunnel floor structure, collapse, cracking, and large-area detachment of the arch wall lining structure. Fault slippage is a major cause of severe damage to multi-arch tunnels traversing active fault zones. Model experiments, as a research method that can effectively simulate complex geological conditions and structural responses, are an important tool for studying the impact mechanism of fault slippage on engineering structures. Currently, scholars both domestically and internationally have conducted extensive model test studies on tunnels traversing active fault zones. However, existing research mainly focuses on single-arch tunnels, with relatively scarce experimental studies on double-arch and multi-arch tunnels. Therefore, developing a model test chamber suitable for simulating the slippage of double-arch tunnels traversing normal faults is of significant practical importance for improving the structural design theory of double-arch tunnels traversing normal faults and enhancing engineering safety performance. Utility Model Content

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a test device for simulating the displacement of a double-arch tunnel by longitudinally pushing the left half box. This device can simulate the longitudinal displacement of a double-arch tunnel when passing through a normal fault, thus facilitating simulation tests for double-arch or continuous-flow tunnels, and has a wider range of applications.

[0004] This utility model also provides a test device for simulating normal fault displacement, including a left half box, a right half box, a left arch tunnel, and a right arch tunnel. A sliding surface is provided on one side of the left half box and the right half box. A base is provided on the outside of the left half box. A loading device is connected to one side of the base. The loading device is fixedly connected to the inner wall of the base.

[0005] According to the present invention, a test device for simulating normal fault displacement of a double-arch tunnel is provided, wherein multiple rollers are uniformly arranged on the inner side of the sliding surface, and a fracture zone is provided between the rollers and the sliding surface.

[0006] According to the present invention, a test device for simulating normal fault displacement of a double-arch tunnel is provided at the upper end of both the left and right half-boxes, and a double-arch distance adjuster is provided.

[0007] According to the present invention, a test device for simulating normal fault displacement of a double-arch tunnel includes a loading device comprising a hinge support, a jack, a load sensor, and a displacement sensor. The jack is disposed between the left half-box and the loading device, and the hinge support is disposed at the bottom of the left half-box.

[0008] According to the present invention, a test device for simulating normal fault displacement of a double-arch tunnel is provided at the entrance of the left arch tunnel and the right arch tunnel, respectively, with left arch lining and right arch lining.

[0009] According to the present invention, a test device for simulating normal fault displacement in a double-arch tunnel is provided, wherein the tops of the left and right half-boxes are fixedly connected with I-beams and reinforcing ribs.

[0010] According to the present invention, a double-arch tunnel test device for simulating normal fault displacement is provided, wherein a fixing device is fixedly connected to one side of the base.

[0011] Beneficial effects:

[0012] This utility model displacement model test chamber can more realistically reproduce the displacement mode of subway tunnels. It can flexibly adapt to different experimental needs and has a structure similar in shape to a double-arch tunnel. It can be used to test double-arch tunnels. By setting up a movable left half box and a fixed right half box sliding surface, and by pushing the left half box longitudinally, it can simulate the longitudinal displacement of a double-arch tunnel when passing through a normal fault. This makes it convenient to conduct simulation tests on double-arch or continuous power supply tunnels, with a wider range. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0014] Figure 1 This is a perspective view of a double-arch tunnel test device for simulating normal fault displacement according to the present invention;

[0015] Figure 2 This is a three-dimensional view from the side of a test device for simulating normal fault displacement according to the present invention;

[0016] Figure 3This is a front view of the structural diagram of a double-arch tunnel test device for simulating normal fault displacement according to this utility model;

[0017] Figure 4 This is a left view of a test device for simulating normal fault displacement in a double-arch tunnel according to the present invention.

[0018] Figure 5 This is a top view of a double-arch tunnel test device for simulating normal fault displacement according to the present invention;

[0019] Figure 6 This is a front view of the loading device of a test apparatus for simulating normal fault displacement in a double-arch tunnel according to the present invention.

[0020] Legend:

[0021] 1. Left half box; 2. Double arch distance adjuster; 3. Left arch tunnel; 4. Right arch tunnel; 5. Right half box; 6. Fault zone; 7. Sliding surface; 8. Base; 9. Fixing device; 10. Jack; 11. Loading device; 12. Left arch lining; 13. Right arch lining; 14. Reinforcing rib; 15. I-beam; 16. Load sensor; 17. Displacement sensor. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0023] Reference Figure 1-6 This utility model provides a test device for simulating normal fault displacement in a double-arch tunnel, which includes a left half-box 1, a right half-box 5, a left arch tunnel 3, and a right arch tunnel 4. A sliding surface 7 is provided on one side of the left half-box 1 and the right half-box 5. A base 8 is provided on the outside of the left half-box 1. A loading device 11 is connected to one side of the base 8 and is fixedly connected to the inner wall of the base 8.

[0024] Specifically, the left half-box 1 is used to simulate the lower plate, the right half-box 5 is used to simulate the upper plate, the sliding surface 7 is used to simulate the fracture zone 6, the base 8 is used to connect and stabilize the left half-box 1 and the right half-box 5, and the loading device 11 is used to push the left half-box 1.

[0025] Multiple rollers are evenly arranged on the inner side of the sliding surface 7, and a fracture zone 6 is provided between the rollers and the sliding surface 7.

[0026] The left half-box 1 and the right half-box 5 are both equipped with double arch distance adjusters 2. The double arch distance adjuster 2 is a conventional structure. It is made of two staggered steel plates and is used to adjust the distance between the double arches to achieve different test purposes. When the double arch distance adjuster 2 is removed, the device becomes a continuous arch tunnel.

[0027] The loading device 11 includes a hinge support, a jack 10, a load sensor 16, and a displacement sensor 17. The jack 10 is located between the left half-box 1 and the loading device 11. The hinge support is located at the bottom of the left half-box 1. The loading device 11 contains a first telescopic cylinder, which is a conventional technical structure. The load sensor 16 and the displacement sensor 17 are also conventional technical structures, both of which are available on the market. The displacement sensor 17 synchronously records the longitudinal displacement acceleration and displacement of the left half-box 1; the load sensor 16 synchronously records the longitudinal load on the left half-box 1; and the test data of the strain gauges and earth pressure cells on the tunnel model are also recorded.

[0028] Left arch lining 12 and right arch lining 13 are respectively installed at the entrances of left arch tunnel 3 and right arch tunnel 4.

[0029] The top of both the left half-box 1 and the right half-box 5 are fixedly connected with I-beams 15 and reinforcing ribs 14.

[0030] Specifically, the I-beam 15 and the reinforcing rib 14 are used to increase the overall strength of the left half box 1 and the right half box 5, ensuring the strength and stability of each part.

[0031] A fixing device 9 is fixedly connected to one side of the base 8.

[0032] In use, by opening a first mounting hole in the left half box 1 that resembles the shape of a double-arch tunnel, the distance can be adjusted to test double-arch or continuous-arch tunnels, thus increasing the range of applications. The sliding surface 7 installed between the left half box 1 and the right half box 5 can simulate vertical displacement. The loading device 11 drives the left half box 1 to move upward or downward, simulating the vertical displacement of the fault, which can improve the accuracy of the test. Moreover, the loading device 11 is controlled by a unified loading control system, which facilitates the simulation of continuous operation during the test.

[0033] Reference Figure 3 and Figure 4 Multiple sets of reinforcing ribs 14 are fixedly connected to the outer walls of the left half box 1 and the right half box 5 to increase the strength of the left half box 1 and prevent cracking at the weld during the test, which would affect the performance. The number of sets of reinforcing ribs 14 is designed according to the specific dimensions of the left half box 1.

[0034] Reference Figure 3 and Figure 4A sliding surface 7 is connected between the left half box 1 and the right half box 5. The right half box 5 has a second mounting hole corresponding to the first mounting hole, which facilitates the installation of the tunnel. A driving part for driving the left half box 1 to slide is provided below the left half box 1. During the test, the driving part can drive the left half box 1 to slide along the sliding surface 7 to simulate the fault action of a normal fault.

[0035] Reference Figure 3 and Figure 4 The drive unit includes two telescopic cylinders fixedly connected to the lower end of the left half box 1, a base 8, fixed rods on both sides of the left half box 1 and a jack at the upper end of the left half box 1. Limiting grooves are provided on both sides of the left half box 1. The telescopic bar at the lower end connected to the fixed rod and the jack at the upper end cooperate with each other to achieve uniform longitudinal loading of the left half box 1.

[0036] Working principle:

[0037] S1. Determine the distance between the two double arches by adjusting the two double arch distance adjusters 2, and fix them in place;

[0038] S2. Place the two ends of the left arch lining 12 and the right arch lining 13 at the left arch tunnel 3 and the right arch tunnel 4 on the left side plate and the tunnel openings on the right side plate, respectively; seal the remaining tunnel openings, and then fill and compact the soil in the model sample box.

[0039] S3. Start the longitudinal loading device 11 to apply a load to the left half box 1, pushing the left half box 1 to move upward through the sliding surface 7 until the set fault displacement amount is reached.

[0040] S4. During the loading process, the longitudinal displacement acceleration and displacement amount of the left half box 1 are recorded synchronously through the displacement sensor 17; the longitudinal load on the left half box 1 is recorded synchronously through the load sensor 16; and the test data of the strain gauges and earth pressure cells on the tunnel model are recorded at the same time.

[0041] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A test device for simulating normal fault displacement in a double-arch tunnel, characterized in that, It includes a left half box (1), a right half box (5), a left arch tunnel (3), and a right arch tunnel (4). A sliding surface (7) is provided on one side of the left half box (1) and the right half box (5). A base (8) is provided on the outside of the left half box (1). A loading device (11) is connected to one side of the base (8). The loading device (11) is fixedly connected to the inner wall of the base (8).

2. The experimental device for simulating normal fault displacement in a double-arch tunnel according to claim 1, characterized in that, Multiple rollers are evenly arranged on the inner side of the sliding surface (7), and a fracture zone (6) is provided between the rollers and the sliding surface (7).

3. The experimental device for simulating normal fault displacement in a double-arch tunnel according to claim 1, characterized in that, Both the left half-box (1) and the right half-box (5) are equipped with double-arch distance adjusters (2) at their upper ends.

4. The test device for simulating normal fault displacement in a double-arch tunnel according to claim 1, characterized in that, The loading device (11) includes a hinge support and a jack (10), a load sensor (16) and a displacement sensor (17). The jack (10) is located between the left half box (1) and the loading device (11), and the hinge support is located at the bottom of the left half box (1).

5. The test device for simulating normal fault displacement in a double-arch tunnel according to claim 1, characterized in that, The left arch tunnel (3) and right arch tunnel (4) entrances are respectively provided with left arch lining (12) and right arch lining (13).

6. The experimental apparatus for simulating normal fault displacement in a double-arch tunnel according to claim 1, characterized in that, The top of the left half box (1) and the right half box (5) are fixedly connected with I-beams (15) and reinforcing ribs (14).

7. The experimental device for simulating normal fault displacement in a double-arch tunnel according to claim 1, characterized in that, A fixing device (9) is fixedly connected to one side of the base (8).

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