A Model Test Device for Staggered Failure of Tunnel Crossing Active Fault Zones that Can Apply Triaxial Stress

Abstract

The invention discloses a model test device for the dislocation damage of a tunnel crossing an active fault zone that can apply triaxial stress. The sample is subjected to triaxial loading, and the test in the third test chamber is subjected to triaxial loading through the second longitudinal loading device, the third lateral loading device and the third vertical loading device, and the first longitudinal loading device and the second longitudinal loading device The output force and the second lateral loading device and the second vertical loading device carry out triaxial loading on the test in the second test chamber; the first test chamber and the third test chamber are realized by the first driving device and the second driving device. In order to realize the simulation of the relative displacement between the upper and lower walls of the active fault zone and the weak geological bodies in the fault zone, to obtain the displacement distribution mode and evolution law of the geological bodies in the fault zone when the active fault zone is dislocated, In order to reveal the surrounding rock response of the tunnel (cave), the scientific design of the support system provides a reliable experimental method.

Description

technical field [0001] The invention relates to the technical field of rock mechanics model test equipment, in particular to a model test device capable of applying triaxial stress to the dislocation failure of tunnels passing through active fault zones. Background technique [0002] In order to adapt to the rapid development of my country's national economy, a large number of tunnels (holes) and other projects need to be built in the fields of transportation and water conservancy. my country is an earthquake-prone country, and active fault zones are widely distributed. In recent years, many traffic tunnels and hydraulic tunnels built in the west inevitably cross the active fault zones. There are two forms of motion at the interface of active fault zones: creep and dislocation: creep displacement is generally small, and generally does not cause direct and immediate damage to engineering structures, but large creep displacement will also cause certain damage to engineering fa...

AI Technical Summary

Problems solved by technology

[0005] 1) The model test is often completed by simple shear equipment, and the stress is applied uniaxially or biaxially, and there is a lack of research on the failure mechanism of tunnel displacement under the condition of triaxial stress;

[0006] 2) The shear layer thickness of the simulated weak zone in the model test sample is small. Due to factors such as stress concentration, it is impossible to truly simulate the real situation of the dislocation at the interface between the weak geological body and the upper and lower walls of the fault zone.

[0007] 3) The model test equipment cannot excavate the model sample after the stress is applied

Due to the lack of model test equipment capable of reasonably simulating tunnel dislocation damage in active fault zones, research on such issues is mainly carried out through numerical simulation, which is unfavorable for tunnel support construction across active fault zones

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