Gob-side entry retaining roadway supporting method for three-soft coal seam coal-pillar-free mining

Abstract

The invention discloses a gob-side entry retaining roadway supporting method for three-soft coal seam coal-pillar-free mining. The method comprises the steps that a row of lockrand anchor cables are constructed on the part, close to a coal side, of an advance roadway; an iron gauze is laid on the part, close to the goaf side, of a lagging roadway, and a silicomanganese steel pipe gangue blocking column is arranged outside the iron gauze in a blocking mode; a movable base is laid on a bottom plate of a following working face of a reserved roadway, two combined hydraulic supports are installed on the movable base, one combined hydraulic support is installed through a solid coal side, the other combined hydraulic support is installed through a goaf, and the combined hydraulic supports are lifted to initial supporting force after installation is completed; and after the length of the reserved roadway exceeds the preset length, the combined hydraulic supports are dismantled, and when the combined hydraulic supports are dismantled, the far-end combined hydraulic support is dismantled step by step along with advancing of the working face from the preset length lagging behind the working face. The three-soft coal seam roadway surrounding rock deformation control effect is better, and the effects of high supporting strength and high safety are achieved for goaf side gangue blocking supporting and rear roadway surrounding rock top and bottom plates.

Description

technical field [0001] The invention belongs to the technical field of roadway support and surrounding rock control in coal mines, and in particular relates to a support method for roadway retention along the gob under the condition of three soft coal seams. Background technique [0002] The three soft coal seams refer to the coal seams in which the roof rock stratum, main coal mining seam and floor rock strata encountered in underground mining of coal mines are all weak rock strata, with well-developed coal seam fissures and complex structures. Therefore, it is particularly difficult to control the surrounding rock of the gob-side entry retaining roadway in non-coal pillar mining under the geological conditions of the three soft coal seams, especially the bottom heave problem of the roadway is difficult to solve. With the technical update of gob-side entry retention in mining without coal pillars, the roof cutting and pressure relief mining method can better solve the probl...

AI Technical Summary

Problems solved by technology

[0003]The present invention is to solve the problem that the roadway support of the gob-side entry roadway is difficult to support in the mining without coal pillars under the geological conditions of the three-soft coal seam, and the bottom of the roadway is severely heaved and needs to be repaired by secondary bottom pulling , proposed a support method for gob-side entry retaining roadway in three-soft coal seam geological conditions and supporting supporting devices, which can effectively control the deformation of gob-side entry retaining roadway, simplify the support process, and reduce support difficulty and labor Strength, to achieve the goal of secondary reuse of gob-side entry roadway in three-soft coal seam without coal pillar mining

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