Method for controlling surrounding rock deformation of gateway subjected to repeated overhead mining by using hollow grouting anchor cable

Abstract

The invention relates to a method for controlling surrounding rock deformation of a gateway subjected to repeated overhead mining by using a hollow grouting anchor cable. The method comprises the following implementation steps of: performing repair brushing on the section of the gateway, reinforcing support in a bottom plate gateway to be mined in an advance face which is 280-320 meters in range by adopting high-performance pre-stressed anchor rods, and meanwhile, arranging a metal net on the entire section of the gateway; arranging a novel hollow grouting anchor cable between a top plate of the gateway and the high-performance pre-stressed anchor rods on both sides; grouting on the surface of the surrounding rock of the gateway for enclosing; and injecting a grouting material into the hollow grouting anchor cable. The method has the characteristics of high setting load, sudden increase in resistance and high bearing capability, the problems of high gateway deformation, strong heaving floors and difficulty in maintaining can be well solved, the gateway repair times are reduced, and the gateway support cost is reduced effectively; and the method is particularly suitable for solving the problems of rapid attenuation and loss of anchoring force caused by looseness, breakage and large deformation of surrounding rock due to repeated overhead mining on the gateway.

Description

technical field [0001] The invention relates to a method for reinforcing roadways affected by multiple cross-cuts in underground mines, in particular to a method for controlling the deformation of surrounding rocks in roadways with multiple cross-cuts by hollow grouting anchor cables. Background technique [0002] Coal seam groups in close distances generally adopt the mining method of multi-coal seam joint arrangement, and prepare roadways on the coal seam floor. In order to increase the continuous advancing length of the working face and reduce the number of relocations, many mining areas adopt cross-roadway mining, which causes severe deformation of the crossed roadway during mining. Even damage and instability. With the continuous increase of my country's demand for coal and the increasingly complex mining conditions, multiple cross mining roadways have almost become an unavoidable technical problem, and its proportion will further increase. [0003] At present, the met...

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Problems solved by technology

[0004] In order to solve the problem that the effect of the existing technology for controlling the deformation of the surrounding rock in cross mining roadways is not obvious, the present invention provides a hollow grouting anchor cable to control multiple cross mining roadways The method of surrounding rock deformation, this method combines the supporting function of the anchor cable with the effect of grouting reinforcement, and works together on the surrounding rock of the roadway. The anchoring is reliable, and the grout can penetrate into a large range of surrounding rock around the drill hole, which can bond and solidify the loose and broken surrounding rock, significantly improve its integrity, improve the self-supporting ability of the surrounding rock, and thus greatly improve the roadway The support effect is a very good form of active support

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