Mechanism of instability of surrounding rock of stope in close distance coal seam group and control technology

doi:10.16265/j.cnki.issn1003-3033.2017.05.022

Abstract

Abstract: For the sake of exploring the mechanism of instability of surrounding rock of stopes in close distance coal seams and developing a technology for controlling the instability, distribution of mining pressure field under coal seam group mining was studied by means of calculation, simulation and laboratory experiments. A mechanical mechanism of water injection reinforcement was illustrated. Comprehensive technical measures of the deep-hole presplitting explosion, the short-hole water infusion at working face and the deep-hole water infusion in haulage roadway and coal mining technology were worked out. The research shows that two working faces influence each other tempestuously, that if the under working face is arranged in the distressed zone of the upper working face, then the original stress of the upper working face can be reduced, that the deep-hole presplitting explosion can be used to avoid the shock to the under working face for the key stratum fracture, that the short-hole water infusion at working face and the deep-hole water infusion in haulage roadway can be used to improve the shear strength of loose coal and the stability of coal wall.

Key words: close distance coal seams group, loose coal, surrounding rock, instability mechanism, mining technology

CLC Number:

X936

LI Jiazhuo, TAN Wenfeng, LI Chuanming, ZHU Chuanqi, MA Haifeng. Mechanism of instability of surrounding rock of stope in close distance coal seam group and control technology[J]. China Safety Science Journal, 2017, 27(5): 122-127.

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