Fault-crossing tunnel flexible isolation structure and engineering rock mass large deformation disaster control method

Abstract

The invention provides a fault-crossing tunnel flexible isolation structure and an engineering rock mass large deformation disaster control method, the flexible isolation structure comprises a giant NPR anchor cable, a monitoring unit and an acquisition unit, the giant NPR anchor cable comprises a constant resistance body, a constant resistance sleeve and an anchor cable, and the constant resistance body is arranged in the constant resistance sleeve. The method comprises the steps of S1, directly drilling a hole in a shallow-buried section of a tunnel from the earth surface or excavating a setspace area from the earth surface and then laying an NPR anchor cable, and excavating a pilot tunnel in a deep-buried section of the tunnel from the inside to the outside of the tunnel; S2, performing support construction on the space area; S3, placing the giant NPR anchor cable after penetrating through a fault; and S4, anchoring an anchoring section. Three-dimensional stitching is carried out on strong-activity geological areas such as a tunnel crossing fault or an active fault through construction of the giant NPR anchor cables, the purpose of area locking is achieved, and monitoring, early warning and supporting integrated control over the tunnel crossing strong-activity geological areas is achieved.

Description

technical field [0001] The invention belongs to the technical field of large deformation control of highly active engineering rock mass, and in particular relates to a flexible isolation structure of a fault-crossing tunnel and a method for controlling large deformation disasters of engineering 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 deformation...

AI Technical Summary

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

Images