摘要
针对复合顶板沿空巷道煤柱合理尺寸难以确定及支护困难等问题,以泊江海子矿3-1煤层一面三巷布置的工作面为工程背景,采用理论分析和现场实测的方法,研究工作面回采后煤柱应力的分布规律。现场实测结果表明,工作面回采后煤柱应力沿侧向可分为低应力区和高应力区,低应力区距采空区边缘距离为14.5m,高应力区距采空区边缘距离为14.5~20m,最大应力峰值为29MPa,考虑到煤层裂隙发育、煤壁片帮等因素,综合确定沿空掘巷煤柱宽度为9m。同时结合具体地质条件进行沿空掘巷支护方案设计及矿压观测,巷道支护实践表明,试验巷道采用所确定的煤柱宽度及锚索网支护参数后,巷道围岩稳定,实现了工作面安全高效开采。
In view of the difficulty in determining reasonable size of coal pillar and supporting in gob side entry with composite roof, taking the working face with one face and three entries in 3-1 coal seam of Bojiang Haizi Mine as the engineering background, the distribution law of coal pillar stress after mining is studied using theoretical analysis and field measurement. The field measurement results show that the stress of coal pillar can be divided into low stress area and high stress area along the lateral direction, the distance between the low stress area and the edge of the goaf is 14.5 m, and the distance between the high stress area and the edge of the goaf is 14.5~20 m, the peak stress is 29 MPa. Considering the development of coal seam fissures, coal wall spalling and other factors, the width of coal pillar in gob side entry driving is determined as 9 m. At the same time, combining with the specific geological conditions, the gob side entry support scheme is designed and the mine pressure is observed. The practice shows that, after the determined coal pillar width and anchor cable mesh support parameters are adopted in the test roadway, the surrounding rock of the roadway is stable, and the safe and efficient mining of the working face is realized.
作者
朱翔斌
杨张杰
程雁斌
丁晶
王庆牛
陈康
ZHU Xiang-bin;YANG Zhang-jie;CHENG Yan-bin;DING Jing;WANG Qing-niu;CHEN Kang(Bojiang Haizi Mine,Inner Mongolia Silver Macro Energy Development Co.,Ordos 017006,China;Ltd.,Anhui Province Coal Science Research Institute,Hefei 230001,China)
出处
《煤炭工程》
北大核心
2022年第1期40-44,共5页
Coal Engineering
基金
安徽省重点研究与开发计划资助项目(1804a0802210)。
关键词
煤柱应力
沿空掘巷
煤柱宽度
围岩控制
围岩变形
coal pillar stress
gob-side entry driving
coal pillar width
surrounding rock control
deformation of surrounding rock
