Reconstructed bearing layer control technology of large-deformation roadway surrounding rock

Abstract

The invention discloses a reconstructed bearing layer control technology of large-deformation roadway surrounding rock. The method comprises the following steps of (1) performing the construction of a basic support system action zone of the roadway surrounding rock; (2) performing the construction of upper drill holes and lower drill holes in the lower portions of both sides of the roadway and enabling the horizontal depths of the upper drill holes and the lower drill holes to be lapped with the rock of elastic zones deep in both sides of the roadway; (3) laying a grouting liquid conveying system; (4) mounting upper grouting steel pipes, lower grouting steel pipes, supporting boards, fasteners and perforated seal plugs; (5) starting a grouting pump and enabling superfine cement grouting fluid or other grouting materials to be pressed around the upper drill holes and the lower drill holes in the lower portions of both sides of the road way and into the gaps between the basic support system action zone and a plastic (crack) zone of the surrounding rock through grouting hosepipes and the grout inlet holes and the liquid-flow holes of the grouting steel pipes; (6) when the grouting pressure and the grouting time both reach preset values, closing the grouting pump to stop grouting; (7) removing the grouting hosepipes and the perforated seal plugs from the external end portions of the upper grouting steel pipes and the lower grouting steel pipes and sealing up the grout inlet holes of the grouting steel pipes with solid seal plugs; and (8) performing the construction of an upper-lower reconstructed bearing layer zone on the lower portions of both sides of a next group of roadway in the same manner.

Description

technical field [0001] The invention relates to a large-deformation roadway surrounding rock control technology, which is a method of horizontal drilling at the upper and lower parts of the two sides of the roadway and overlapping of the rock formation in the elastic zone, installation of upper and lower grouting steel pipes, high-pressure grouting and sealed upper and lower grouting. It is a large-deformation roadway surrounding rock control technology that makes the lower part of the two sides of the roadway form a reconstructed bearing layer through the grouting hole of the slurry steel pipe and through the action area of ​​the basic support system. Background technique [0002] The stability of the surrounding rock in the deep mine roadway is the basis for ensuring the safety of personnel and realizing the efficient mining of the working face. Under the action of deep high stress, the lithological softening characteristics of the surrounding rock of the roadway are promi...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the existing basic support system (bolt, anchor cable, section steel, roadway surrounding rock grouting reinforcement) of the large deformation roadway is difficult to be effectively controlled, and proposes a control technology for the reconstruction of the upper and lower parts of the lower part of the two sides of the roadway.

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