Large inclined angle coal seam gob-side entry retaining flexible roadway protection method

Abstract

The invention discloses a large inclined angle coal seam gob-side entry retaining flexible roadway protection method which comprises the following specific steps: at the lower end of a working face, adopting a digging and blasting manner to construct an advance groove with the length being 5-10 m and the width being 3-5 m along the working face trend; in the advance groove, fixing an anchor rod through a top plate and a bottom plate, and arranging a specially-made reinforcing mesh to form a flexible structure; intercepting and wrapping gangue collapsing and sliding from a goaf to form a roadway-side supporting body; and enabling the roadway-side supporting body and a cable anchor in the roadway to jointly support and act to maintain the stability of roadway retained surrounding rock. The large inclined angle coal seam gob-side entry retaining flexible roadway protection method has the characteristics of being small to influence to working face production, low in roadway retained cost,simple in technology and high in roadway retained speed.

Description

technical field [0001] The invention belongs to the technical field of roadside support for gob-side entry retention, and in particular relates to a flexible entry protection method for gob-side entry retention in large-inclination coal seams. [0002] technical background [0003] Gobside retaining is a technology to maintain the original mining roadway along the edge of the goaf after mining in the working face. The use of gob-side entry retaining technology can prevent mine disasters caused by coal pillars, and at the same time improve coal recovery rate, reduce roadway excavation rate, reduce the cost per ton of coal, and alleviate the tension of mining replacement. [0004] The mining conditions of coal resources in my country are complicated, and the coal production of coal seams with large dip angles (35°-55°) accounts for about 10% of the total coal production in the country. In recent years, as the application of gob-side entry technology in the mining of near-horiz...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical difficulties of the existing gob-side retaining technology, such as complex process, high cost of road protection, and affecting normal production of the working face, the present invention provides a flexible method for retaining roadways along the gob-side of coal seams with large dip angles. The method is to work in the roadway A certain size of advance groove is constructed in front of the front, and the reinforcement mesh is arranged through the top and bottom plates to form a flexible structure in the advance groove, which intercepts and wraps the gangue that collapses and slides in the goaf, and forms a roadside support body with the collapsed gangue as the aggregate. The stability of the surrounding rock of the roadway is maintained by the joint support of the roadside support body and the roadway anchor net cable joint support

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