Test device for simulating tunnel active fault crossing

Abstract

The invention discloses a test device for simulating tunnel active fault crossing. The test device comprises a fixed box body (left half box), a movable box body (right half box), a rigid base, a rolling shaft support, a movable steel plate and a crank sliding block loading device. A motor drives the crank to move, and then a connecting rod pushes the sliding block, so that the right disc of the model box can be driven to move unidirectionally and repeatedly. Different fault dislocation rates can be simulated by adjusting the rotating speed of the motor. By adjusting the relative proportion ofthe lengths of the crank and the connecting rod, different fault dislocation amounts can be applied. According to the device, simulation of surrounding rock at the bottom of the urban shallow-buriedsubway tunnel can be realized, and subway tunnel simulation at different dislocation rates can also be simulated. In addition, the test device can simulate the stress conditions of tunnels with different burial depths, different tunnel bottom surrounding rock properties and different fault and tunnel included angle crossing active faults.

Description

technical field [0001] The invention relates to a device for seismic response of tunnels, in particular to a test device for simulating urban subway tunnels crossing active faults. Background technique [0002] A fault is a geological structure in which the crustal rock layer is ruptured due to the pressure or tension generated by the crustal movement exceeding its own strength, and relatively moves along the rupture surface. Faults vary in size and scale, and the rocks in the fault zone are often broken. A fault is composed of a fault plane and a fault plate. The fault plane is the rupture surface where the rock blocks are displaced relative to each other. According to the relative motion of the upper and lower walls, they can be divided into Qing-slip faults, strike-slip faults and oblique slip faults. There are two basic types of frictional sliding of rock blocks: creep slip and stick slip. Stick-slip dislocation is a kind of unstable sliding, manifested as a sudden la...

AI Technical Summary

Problems solved by technology

For urban shallow-buried subway tunnels, when the buried depth of the tunnel is close to the vertical position of the fault fracture zone, the influence of the properties of the surrounding rock at the bottom of the tunnel on the tunnel cannot be ignored, and the existing model test chambers do not consider the properties of the surrounding rock at the bottom of the tunnel. Impact

Secondly, each experimental model box uses a jack or a liquefaction system loading device, but the experimental loading device can only move in a certain direction at a fixed rate, and cannot simulate the reciprocating movement of the fault and the change of the movement rate.

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