Coal pillar-free mining gob-side entry retaining roadway supporting system and method for three-soft-stratum coal seam

Abstract

The invention discloses a coal pillar-free mining gob-side entry retaining roadway supporting system and method for a three-soft-stratum coal seam. The system comprises a plurality of first pi-shapedbeams, wherein the plurality of first pi-shaped beams are uniformly arranged in an advancing roadway; a plurality of second pi-shaped beams are uniformly arranged in a lagging roadway; single props are arranged below the first and second pi-shaped beams; a plurality of gangue blocking pillars are uniformly arranged in the lagging roadway at intervals and are arranged close to a gob side; the sides, approaching the gob side, of the gangue blocking pillars are provided with a gangue blocking net; a top plate on the side wall of the advancing roadway is provided with a row of edge locking anchorropes; and the edge locking anchor ropes are located on a coal wall side of a working face. According to the system and the method, the support is strengthened by the edge locking anchor ropes; the reinforced support to the top plate approaching the gob side is realized; the sinking of the top plate is controlled in advance; by adopting the combination of the pi-shaped beams and the single props,the support to the top plate for a gob-side entry retaining roadway is realized; the support resistance is high; the lateral pressure and side bulging of a gangue side are effectively controlled by arranging the gangue blocking pillars and the gangue blocking net; and by using the system and the method, the rotatory sinking of the top plate for the gob-side entry retaining roadway and the deformation of the gob-side entry retaining roadway are effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of underground roadway support and rock formation control in coal mines, and in particular relates to a roadway support system and method for goaf-side roadway retention in three-soft coal seam mining without coal pillars. Background technique [0002] The third soft coal seam refers to the coal seam in which the roof strata, main coal seam and floor strata encountered in the underground mining of coal mines are all weak rock strata. The third soft coal seam has well-developed fractures and complex structures. It is especially difficult to control the surrounding rock of entry retaining roadway; with the popularization of non-coal pillar mining along gob entry, no matter what kind of mining method without coal pillar, it will take a certain amount of time for the overlying strata to rotate stably and the gangue in the goaf to be compacted , the existing gob-side retaining support technology is difficult to m...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problems existing in the prior art, the present invention provides a gob-side entry retaining support system and method in three-soft coal seam mining without coal pillars to solve the difficulty of the existing gob-side entry retaining support process. Technical Problems of Difficult Maintenance of Roadway Section

Images