High-stress soft rock roadway supporting system with metal mesh backplane and construction method

Abstract

The invention discloses a high-stress soft rock roadway supporting system with a metal mesh backplane and a construction method. The system sequentially comprises the metal mesh backplane, a confined concrete arch, a filling material blocking cloth, a backwall filling material and a bolt-mesh-spurting support from inside to outside, wherein the metal mesh backplane is located below the confined concrete arch; the metal mesh backplane is connected with the filling material blocking cloth; and the outer edge of the confined concrete arch is connected with the bolt of the bolt-mesh-spurting support via a pre-stressed steel strand. The high-stress soft rock roadway supporting system with the metal mesh backplane has the beneficial effects that the metal mesh backplane is located at the lower side of the arch, thereby reducing the material use amount of the metal mesh backplane; the position of the metal mesh backplane changes, the arch is directly contacted with the filled concrete material, force borne by the arch tends to be uniform, the force is together borne by the arch, the filling layer and the surrounding rock, the overall supporting performance of the arch is improved, the bearing ability of the arch and the self-bearing ability of the surrounding rock are used, and stability of the support is facilitated.

Description

technical field [0001] The invention relates to a support system and a construction method of a roadway containing a metal mesh backboard, in particular to a construction scheme for determining the installation position of the metal mesh backboard of a high-stress soft rock roadway support system. Background technique [0002] In recent years, anchor shotcrete support has been widely used at home and abroad. At present, the main problem of using bolt and shotcrete support in large deformation roadways is that the flexibility of the shotcrete and the bolt does not match very much. Under the action of surrounding rock deformation and blasting vibration, the shotcrete cracks prematurely and fails, and loses the interaction with the bolt. Due to the unfavorable conditions, the performance of the surrounding rock continued to deteriorate, and pieces of surrounding rock and concrete fell one after another, causing serious roof fall and slab accidents. In order to avoid premature ...

AI Technical Summary

Problems solved by technology

[0003] (1) The metal mesh backboard is installed between the arch frame and the surrounding rock, which is not convenient for workers' daily maintenance and increases the workload

(2) Since the structure of the metal mesh backplane is inevitably in point contact and surface contact with the arch frame, it may cause the arch frame to be subjected to unevenly distributed concentrated loads and eccentric loads

Reduced bearing capacity of the arch

(3) The metal mesh is a flexible support material with small rigidity and large deflection. It is easily deformed or even damaged when placed between the arch frame and the surrounding rock without strong tensile stress.

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