Tunnel instability mechanism test device and method capable of simulating fault slippage and dislocation

Abstract

The invention relates to a tunnel instability mechanism test device and method capable of simulating fault slippage and dislocation. The device comprises a loading mechanism which includes a front counter-force beam and a rear counter-force beam, a counter-force frame and a fault slippage mechanism, wherein a plurality of mouth-shaped middle counter-force beams are arranged between the front counter-force beam and the rear counter-force beam, the top and side parts of the middle counter-force beams and a rear counter-force frame are provided with loading parts, an excavation opening is formed in the front counter-force beam, and a first dislocation driving piece is arranged at the bottom of the middle counter-force beam; the counter-force frame includes a plurality of ring beams fixedly arranged on the periphery of the loading mechanism; and the fault slippage mechanism includes a gate-type counter-force frame which can slide in the axis direction of the excavation opening and can vertically move, and second dislocation driving pieces are arranged on the side portion and the top of the gate-type counter-force frame. The test device can truly simulate a three-dimensional static and dynamic load and multi-fault bidirectional slippage composite environment where the tunnel is located in the actual working condition.

Description

technical field [0001] The invention relates to the technical field of test equipment, in particular to a tunnel instability mechanism test device and method capable of simulating fault slip and dislocation. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Tunnel engineering is an important part of traffic construction and mining. Affected by engineering needs and geographical environment, tunnel construction will inevitably pass through faults, broken zones and other unfavorable geological bodies. Under the action of external high stress, faults will be caused to slip locally or as a whole, causing major damage to tunnels under construction or completed. . At the same time, the structural fault zone is often a seismically active zone. At the same time as the tunnel slips, it is often accompanied by the disturbance of the surrounding stratum vibra...

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Problems solved by technology

However, the inventors found that the fault slip position of this device is fixed, and only the two-dimensional stress loading on the upper part of the model (simulating the overlying formation pressure) and the front part (simulating the horizontal stress) can be realized, and the real three-dimensional static load and dynamic load stress cannot be realized. Loading and multi-fault slip simulation

[0008] Comprehensive analysis shows that the existing physical simulation test system for tunnel mechanical characteristics has the following disadvantages: the existing test system can only realize the coupling environment simulation of two-dimensional load and two-way slip of a single fault, and the fault position is fixed, which cannot truly simulate the actual working conditions The complex environment of three-dimensional static and dynamic load, multi-fault two-way slip, and the flexible adjustment of the number and position of faults in the middle tunnel

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