Deep well tunnel cable anchor rigid-flexible coupling support and surrounding rock overall reinforced support method

Abstract

The invention discloses a deep well tunnel cable anchor rigid-flexible coupling support and surrounding rock overall reinforced support method which is characterized by firstly excavating a tunnel according to the shape of cross section of the tunnel, and spraying concrete on the surface of surrounding rocks of the cross section formed by excavation; adopting a steel bar mesh and a high-strength prestressed anchor for supporting the surrounding rocks of the tunnel in time; implementing high-strength prestressed anchor cables at the center and two spandrels at the top part of the tunnel; re-spraying the concrete on the surface of the surrounding rocks of the tunnel; mounting a grouting anchor pipe on a top plate and two side surrounding rocks of the tunnel after the tunnel is excavated for 15-20d, and injecting cement slurry into fracture regions of the surrounding rocks of the tunnel; excavating a baseplate of the tunnel after the tunnel is excavated for 25-30d, mounting the grouting anchor pipe, injecting cement slurry liquid into a rock layer of the baseplate; and finally using the concrete to backfill the baseplate of the tunnel flat. The method can solve the problems of large deformation of the deep well tunnel and serious floor heave, avoid the repair work of the tunnel and have significant economic benefits.

Description

technical field [0001] The invention discloses a support method for a deep well roadway, in particular to a rigid-flexible coupling support method for a deep well roadway anchor net cable and an integral reinforcement support method for surrounding rock, especially suitable for roadway surrounding rocks with large deformation, strong bottom sag, and service long-term deep well rocky roadway. Background technique [0002] At present, most mines in our country have entered into deep mining one after another. With the increase of mining depth, the original rock stress and tectonic stress continue to increase, and the mining conditions are becoming more and more difficult, especially the problem of deep mine roadway support, which has always been a problem for deep mining of coal mines. problem. For deep roadway surrounding rock stability control technologies, most of them have followed the shallow mining, such as bolt + shotcrete support, U-shaped steel fully enclosed shed and...

AI Technical Summary

Problems solved by technology

At present, these technologies have the following problems: 1) The coupling problem between the structure and mechanical properties of the roadway support body, the mechanical properties of the surrounding rock in the deep roadway, and the stress and load characteristics of the rock mass has not been well solved, resulting in the inability of the existing roadway support forms to adapt Requirements for deformation of surrounding rock in deep tunnels; 2) The stability of surrounding rocks in deep tunnels cannot be effectively controlled, and deep tunnels still generally suffer from severe deformation, strong bottoming, and difficult maintenance; 3) The tunnels need to be repaired frequently, and the construction is complicated , the cost of roadway support is high

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