The surrounding rock of the bottom extraction roadway in Gaocheng Coal Mine of Zhengzhou Coal Industry Group is weak and fragile,and is strongly affected by ground stress,resulting in frequent hole collapse of extraction drilling holes.In order to reduce the deformation and damage of extraction drilling holes and improve the efficiency of gas extraction,numerical simulation methods are used to analyze the deformation and damage characteristics of the surrounding rock of the bottom extraction roadway under different horizontal stress influences.The drilling hole imaging trajectory detection device is used to monitor the drilling holes deformation and cracks distribution.The results indicate that the influence of horizontal stress should be fully considered when arranging holes for extraction,avoiding stress concentration areas such as high horizontal stress areas and the center of the roadway roof,in order to improve the stability of extraction drilling holes.
关键词
水平应力/围岩变形/底抽巷/抽采孔布设
Key words
horizontal stress/surrounding rock deformation/bottom extraction roadway/layout of extraction hole
维普
万方数据