Roadside gangue mixture filling and gob-side entry retaining method for large-dip angle coal seams

Abstract

The invention discloses a roadside gangue mixture filling and gob-side entry retaining method for large-dip angle coal seams. The method is suitable for gob-side retaining of mining roadways through the steep long wall mining method. The method comprises the steps of comprehensively processing and transporting filling coagulation grout, advancing a working surface and supports, erecting the roadway retaining and gangue stopping supporting supports, laying fence nets, laying grouting pipelines and pumping the coagulation grout. The coagulation grout is conveyed to the grouting pipelines for bonding gangue sliding down into a whole on the side, close to a section haulage way, of a gob in the back of a stoping working surface, a complex bearing structure with gangue mixture filling bodies and steel bar meshes as the main part is formed, when the filling bodies formed earliest reach the design strength, the supports are not needed for supporting, and the roadway retaining and gangue stopping supporting supports erected earlier can be advanced and moved forwards along with the working surface and act on the gangue mixture filling bodies newly formed. According to the method, the comprehensive investment is low, movement of gob-side entry retaining top plates can be effectively controlled through the bearing structure, roadway surrounding rock can keep stable and the lateral gangue stopping effect can be realized. In addition, the method is simple, construction is easy and the effect is good.

Description

technical field [0001] The invention relates to a gob-side entry retention method for filling with gangue next to a large-inclination coal seam roadway, and is especially suitable for the gob-side entry retention of a long-arm coal mining method mining roadway with a steeply inclined direction. Background technique [0002] Gobside retaining technology is aimed at a mining roadway on the upper working face. During the mining process of the working face, roadside supports (dense supports, gangue bags, high-water quick-setting materials filling the wall) are constructed at the edge of the gob. , concrete blocks and other walls), which will be preserved and used as a mining roadway in the lower working face. Production practice shows that this technology has the advantages of reducing the tunneling rate, recovering coal pillars for road protection, and realizing Y-shaped ventilation. It has been widely used in coal mine production at home and abroad, and has brought great econo...

AI Technical Summary

Problems solved by technology

The current filling wall construction method for gob-side retaining with a large dip angle only uses grouting anchor rods for grouting, and anti-falling I-beams for anti-falling and anti-skidding of single pillars, which cannot well limit the sliding of gangue and block gangue. The fence mesh used is severely deformed and labor-intensive, requiring a lot of manpower and material resources

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