Deep-buried tunnel crossing active fracture water inrush and mud inrush dynamic disaster test system and method

Abstract

The invention provides a deep-buried tunnel crossing active fracture water inrush and mud inrush dynamic disaster test system, which comprises a box body. The central position in the box body is filled with a fracture similar material, and the periphery of the fracture in the box body is filled with fractured hanging wall and footwall tunnel surrounding rock similar materials; a through hole used for simulating tunnel excavation is formed in the first end of the box body, a seepage pressure loading unit is arranged on the side portion of the box body, the top of the box body is closed and provided with a ground stress loading unit, and a fracture dislocation unit is arranged at the position, close to the second end of the box body, in the box body. A vibration load loading point in contact with the earthquake vibration loading unit is arranged at the position, close to the first end, of the bottom in the box body; the device can simulate the water and mud inrush disasters when the tunnel passes through the active fracture under the water-force coupling condition, studies the internal stress, displacement and seepage evolution rules of the waterproof rock mass and the fracture mechanism of the waterproof rock mass in the adjacent fracture process of the tunnel under the action of fracture dislocation and earthquake vibration, and reveals the disaster pregnancy mode and the disaster-causing mechanism.

Description

technical field [0001] The present disclosure relates to the technical field of disaster test devices, in particular to a test system and method for dynamic disasters of water and mud inrush in deep tunnels crossing active fractures. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] For railways that pass through active edges and suture zones of crustal plates, multiple active fault zones will develop along the railway. Among them, these fault zones are composed of multiple sub-faults, and they are huge in scale, high in activity rate, and frequent in seismic activity, which will have a significant impact on the safety of railway tunnels. Due to the development of secondary fractures and joints, the rocks in the fracture zone are poorly consolidated, loose and broken, which is conducive to the enrichment of groundwater to form water-beari...

AI Technical Summary

Problems solved by technology

Therefore, the deep-buried tunnels of the Sichuan-Tibet Railway crossing active faults have a high risk of water and mud inrush dynamic geological disasters, which will seriously threaten the safety of tunnel workers, cause delays in construction schedules and huge economic losses, and pose severe challenges to the long-term operation of railways.

[0004] The inventors found that the existing test devices can only simulate water and mud inrush disasters when tunnels pass through inactive faults, or conduct research on the failure mode of tunnel linings under the action of fault dislocations, and have not been applied to the coupling of high ground stress and high seepage pressure ( Experimental system and method for the study of dynamic disasters of water and mud inrush in deep tunnels crossing active faults under the condition of hydraulic-mechanical coupling

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