Multi-level reinforcement method for gob-side entry retention in high stress and strong disturbance coal seam

Abstract

The invention relates to a high stress strong disturbance coal seam gob-side entry retaining multistage reinforcing method, and specially is suitable for reinforcement of goaf gob-side entry retaining in large mining depth, complex top board and close range high gas seam group exploitation; the method aims at gob-side entry retaining surrounding rocks stress distribution and damage characteristics in each phase; gob-side entry retaining and filling area top board reinforcement, construction filling wall reinforcement, and lane auxiliary reinforcement support and anaphase sealing are carried out, so the gob-side entry retaining can satisfy ventilation, pedestrian safety production and next working face back production needs after final deformation, thus ensuring reliability and long time stability of the gob-side entry retaining; by using the method, the gob-side entry retaining is scientific and reasonable, safe and reliable, easy to construct, and good in effect.

Description

technical field [0001] The invention relates to a multi-stage reinforcement method for gob-side entry retention in high-stress and strong-disturbance coal seams, and is especially suitable for reinforcement of gob-side entry entry retention in goafs when mining large mining depths, complex roofs, and short-distance high-gas coal seam groups. Background technique [0002] For the mining of high ground stress, thick hard roof, and direct overlying close-distance coal seam group, due to the wide "three zones" of the hard roof working face, the mining is strong, the roof pre-cracking is dangerous and difficult, and the side long overhang of the goaf causes high additional stress. , the filling wall bears a large load, is difficult to maintain, and a large number of pressure-relieving gas from adjacent layers pours into the goaf of the protective layer, threatening the safety of the protective layer. At present, there is no coal pillar-free goaf retention under such conditions in ...

AI Technical Summary

Problems solved by technology

[0002] For the mining of high ground stress, thick hard roof, and direct overlying close-distance coal seam group, due to the wide "three zones" of the hard roof working face, the mining is strong, the roof pre-cracking is dangerous and difficult, and the side long overhang of the goaf causes high additional stress. , the filling wall bears a large load, is difficult to maintain, and a large number of pressure-relieving gas from adjacent layers pours into the goaf of the protective layer, threatening the safety of the protective layer. At present, there is no coal pillar-free goaf retention under such conditions in China. Therefore, it is of great significance to conduct research on the technology of gob-side entry retention without coal pillars under such conditions

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