Composite airtight method for roadways under hard roof caving impact in goaf

Abstract

The invention discloses a composite airtight method for a roadway under hard roof caving impact in a goaf. The composite airtight method comprises the steps that a buffer chamber is obliquely excavated to the two sides of the roadway near two roadway stopping lines; a triangular concrete airtight wall is arranged at the position close to the edge of the buffer chamber; three layers of steel wire meshes with sprayed concrete are evenly laid behind the airtight wall in equal distances; and a layer of common concrete airtight wall is arranged behind the steel wire meshes. According to the composite airtight method, in the goaf with a hard roof, huge impact waves generated by caving of the hard roof enter the roadway and are weakened by the triangular concrete airtight wall and the buffer chamber at first, then the rest impact waves are subjected to the flexible impact weakening and absorbing effect of the three layers of steel wire meshes containing the concrete, and at last the remainingpart of impact force is resisted by the common concrete airtight wall. A positive effect is achieved on the roadway and the safety of personnel, and the conditions of equipment shutdown and casualties are avoided.

Description

technical field [0001] The invention relates to the technical field of coal mine mining, in particular to a roadway composite sealing method for the collapse impact of a hard roof in a goaf. Background technique [0002] In the process of coal mining, the large-area collapse of the hard roof can cause many serious consequences, especially the impact force caused by the collapse of the roof will cause huge damage to the roadway and working face. In goafs with hard roofs, once the roof collapses in a large area, the gas in the gobs will be compressed sharply in a short period of time, quickly forming shock waves with strong destructive power, and released into the roadway and other spaces, causing equipment damage. Paralysis and casualties. And in view of this situation, the airtight wall structure that is set at present mostly is rectangular structure, and type, material are single. When the shock wave formed by the collapse of the roof in a large area enters the roadway, t...

AI Technical Summary

Problems solved by technology

In goafs with hard roofs, once the roof collapses in a large area, the gas in the gobs will be compressed sharply in a short period of time, quickly forming shock waves with strong destructive power, and released into the roadway and other spaces, causing equipment damage. Paralysis and casualties

In view of this situation, most of the airtight wall structures currently set up are rectangular structures, and the types and materials are single.

When the shock wave formed by the collapse of the roof in a large area enters the roadway, the energy of the shock wave is much greater than the resistance of the airtight wall, and the rectangular airtight wall has a large stress area, all of which are rigid structures, and there is not enough time for the wall to be buffered, which is very prone to damage , the stability and airtight effect are poor, which can pose a certain threat to the working space such as roadways

Therefore, the damage to the roadway caused by the large-scale collapse of the hard roof in the goaf has not yet reached the level of complete control.

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