Test device for simulation of near-fault seismic oscillation initiated by reverse fault strike-slip movement

Abstract

The present invention discloses a test device for simulation of near-fault seismic oscillation initiated by reverse fault strike-slip movement. The device comprises a cube structure test box body with an opening at the upper surface, and a movable baffle plate is arranged at the lower portion of the surface of one side of the test box body; the upper portion of the movable baffle plate is provided with an embedded plate extended into the test box body, and the movable baffle plate can slide along the embedded plate and the lower surface of the test box body; the test box body is internally provided with a simulation fault communicating the upper surface and the lower surface; a simulation tunnel passing through the simulation fault is arranged at the upper portion of the internal portion of the test box body; an upper disc is arranged between one side, close to the movable baffle plate, of the simulation fault and the inner surface of the test box body, and a lower disc is arranged between one side, far away from the movable baffle plate, of the simulation fault and the inner surface of the test box body; and a plurality of serial pressure-sensitive micro-explosion devices are arranged at the lower portion of the simulation tunnel in the simulation fault. The test device for simulation of near-fault seismic oscillation initiated by reverse fault strike-slip movement can really simulate the seismogenic mechanism of the near-fault seismic oscillation under the effect of the simulation reverse fault strike-slip effect, the test result is accurate, and the cost is low.

Description

technical field [0001] The invention relates to a test device for seismic response of tunnels, in particular to a test device for simulating reverse fault stick-slip dislocation to cause near-fault ground motion. Background technique [0002] With the development of tunnel engineering in China, people pay more and more attention to the safety of tunnels in natural disasters such as earthquakes; similar model test is one of the two main methods of tunnel research and analysis (namely similar model test and numerical simulation), because its Compared with the numerical simulation method, it is more intuitive and authentic, so it is widely used in the research of tunnel disaster prevention; the model test method of the tunnel under the action of earthquake is often the shaking table test, that is, the tunnel is placed in the In the model box, the model box is placed on the vibrating table; the vibrating table vibrates in a predetermined direction, and then the deformation and d...

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Problems solved by technology

[0002] With the development of tunnel engineering in China, people pay more and more attention to the safety of tunnels in natural disasters such as earthquakes; similar model test is one of the two main methods of tunnel research and analysis (namely similar model test and numerical simulation), because its Compared with the numerical simulation method, it is more intuitive and authentic, so it is widely used in the research of tunnel disaster prevention; the model test method of the tunnel under the action of earthquake is often the shaking table test, that is, the tunnel is placed in the In the model box, the model box is placed on the vibrating table; the vibrating table vibrates in a predetermined direction, and then the deformation and damage characteristics of the tunnel are observed; since the vibrating table is a plane as a whole, the vibration direction and speed of each position on it are the same , that is, the shaking table test essentially simulates the consistent excitation of vertically incident seismic waves in the process of ground motion at the far field; however, in the actual near-fault earthquake, its essence is near-field vibration, and the earthquake mechanism is that the fault is generated under the action of tectonic stress Creep-slip: Due to the long-term creep of the seismogenic fault, energy accumulates at the fault, and finally the fault stick-slip occurs; under the action of stick-slip, the rupture of the fault rock mass leads to the occurrence of earthquakes and permanent displacement of the surface, and the fault ruptures The position is the source position of the ground motion caused by the stick-slip action of the active fault; obviously, this non-uniform near-field vibration mode is very different from the currently applied shaking table model test for simulating far-field vibration. The traditional vibration The table test cannot effectively simulate the source mechanism of the non-uniform ground motion and the permanent surface displacement caused by the stick-slip action of the active fault; therefore, the traditional shaking table test is used to study the seismic response of the tunnel under the action of the near-fault ground motion. The test results are very unreasonable.

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