Flexible isolation structure of fault-crossing tunnel and rock mass large deformation control method

Abstract

The invention provides a flexible isolation structure of a fault-crossing tunnel and a rock mass large deformation control method, the flexible isolation structure comprises a giant NPR anchor cable,a monitoring unit and an acquisition unit, and the giant NPR anchor cable comprises a bearing plate, an anchorage device and an anchor cable. The bearing plate is annular and is installed at a drilling opening. The anchorage device abuts against the bearing plate. The method comprises the steps that S1, holes are directly drilled in the shallow-buried section of the tunnel from the earth surface or NPR anchor cables are arranged after a set space area is excavated from the earth surface, pilot tunnel excavation is conducted on the deep-buried section of the tunnel from the inside to the outside of the tunnel, S2, supporting construction is conducted on the space area, and S3, the giant NPR anchor cable is placed after the giant NPR anchor cable penetrates through the fault; and S4, the anchoring section of the giant NPR anchor cable is anchored. According to the method, three-dimensional stitching is carried out on the strong-activity geological area by constructing the giant NPR anchor cable, the purpose of area locking is achieved, and monitoring, early warning and supporting integrated control over the tunnel passing through the strong-activity geological area is achieved.

Description

technical field [0001] The invention belongs to the technical field of large deformation control of highly mobile engineering rock mass, and in particular relates to a flexible isolation structure of a fault-crossing tunnel and a method for controlling large deformation of rock mass. Background technique [0002] There are many cases of large deformation disasters of rock mass in tunnel engineering construction in highly active geological regions. It has always been an international problem that plagues mountain roads, railway tunnels, and underground space engineering. Internationally, such as the Gotthard Base Tunnel in Europe, the Claremont Water Conveyance Tunnel in the United States, and the Bolu Railway Tunnel in Turkey, and a series of major tunnel projects in China, such as the Wushaoling Tunnel on the Lanzhou-Xinjiang Railway, the Shiziyuan Tunnel on the Chengdu-Lanzhou Railway, and the tunnels along the Sichuan-Tibet Railway. Large deformations of the surrounding r...

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Problems solved by technology

Internationally, such as the Gotthard Base Tunnel in Europe, the Claremont Water Conveyance Tunnel in the United States, and the Bolu Railway Tunnel in Turkey, and a series of major tunnel projects in China, such as the Wushaoling Tunnel on the Lanzhou-Xinjiang Railway, the Shiziyuan Tunnel on the Chengdu-Lanzhou Railway, and the tunnels along the Sichuan-Tibet Railway. There have been large deformations of the tunnel surrounding rocks in different degrees and in different forms, and the deformation of the tunnel surrounding rocks passing through the active fault area is more serious. These have caused great difficulties to the tunnel construction and brought serious safety hazards

[0003] In the study of large deformation disaster control of tunnel surrounding rock, scholars at home and abroad have carried out a large number of theoretical, model experiments and field test studies. In the field of deformation disaster control, especially the research on the control of large deformation of surrounding rock at meter level and several meter level is still blank

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