Tunnel anti-roof-caving supporting method under influences of repeated mining

Abstract

The invention provides a tunnel anti-roof-caving supporting method under influences of repeated mining. The method includes the steps of primarily supporting a tunnel, establishing a tunnel model, determining the tunnel anti-roof-caving theoretical key stage under the influences of repeated mining, collecting top plate displacement and surface displacement deformation of the tunnel in real time, determining the tunnel anti-roof-caving actual key stag range under the influences of repeated mining according to the top plate displacement and surface displacement deformation, collecting the breakage depth of the actual key stage range in real time, and conducting reinforced supporting on the tunnel according to the breakage depth. By means of the tunnel model, the tunnel anti-roof-caving theoretical key stage under the influences of repeated mining is obtained; in combination with the top plate displacement and surface displacement deformation, the actual key stage range is obtained; the reinforced supporting is conducted on the tunnel in the actual key stage range, roof caving accidents of the tunnel under the influences of repeated mining can be effectively avoided, and the tunnel maintains safe and stable.

Description

technical field [0001] The invention relates to the technical field of roadway roof fall prevention support, in particular to a roadway roof fall prevention support method under the influence of repeated mining. Background technique [0002] The expansion of surrounding rock damage caused by repeated mining in the roadway is a dynamic evolution process, which is mainly considered from two aspects: one is the time effect, that is, the location of the roadway remains unchanged, and the plastic zone of the surrounding rock occurs with the change of the advancing distance of the working face The second is the spatial location, that is, when the advancing distance of the working face is certain, the plastic zone of the surrounding rock of the roadway has the characteristics of partition failure at different positions. A detailed grasp of the deformation and failure laws of the surrounding rock of this type of roadway is the premise and key to the roof fall prevention control of t...

AI Technical Summary

Problems solved by technology

After the roadway bolt support has undergone the first mining until the stable stage, the surrounding rock of the roadway will be damaged to a certain extent, the deformation of the surrounding rock of the roadway will increase, and the anchor cable will extend to a certain extent. When the roadway undergoes secondary mining, the surrounding rock will The amount of deformation continues to increase. If the amount of extension does not meet the amount of deformation of the surrounding rock, the support body will fail, and there will be a hidden danger of roof fall in the roadway

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