摘要
为了探究倾斜煤层沿空巷道合理煤柱宽度留设,采用理论分析、数值模拟和工业性试验相结合的方式开展研究。结果表明:通过建立沿空巷道基本顶力学模型,推导出倾斜煤层内应力场影响范围为12.2~12.8 m;数值模拟不同煤柱宽度下巷道围岩偏应力分布特征,最终确定合理窄煤柱宽度为10 m;继而提出顶板预应力锚杆+高强度单体锚索+桁架锚索支护耦合作用下的非对称围岩控制技术,现场矿压观测结果表明巷道围岩稳定性良好。
To explore the reasonable pillar width of roadway along goaf in inclined coal seam, theoretical analysis, numerical simulation and industrial test are combined to carry out the research. The results show that the influence range of stress field in inclined coal seam is 12.2 m to 12.8 m by establishing the basic roof mechanics model of roadway along goaf;the distribution characteristics of deviating stress in surrounding rock of roadway under different widths of coal pillar are numerically simulated,and the reasonable narrow coal pillar width is determined to be 10 m;then the asymmetric surrounding rock control under the coupling action of roof pre-stressed bolt + high strength single bolt cable + truss bolt cable support is proposed. The results of field observation show that the surrounding rock of roadway is stable.
作者
徐仁桂
翟春佳
刘丽民
李常浩
XU Rengui;ZHAI Chunjia;LIU Limin;LI Changhao(Inner Mongolia Coal Science Research Institute Co.,Ltd.,Hohhot 010010,China;College of Energy and Mining,China University of Mining and Technology(Beijing),Beijing 100083,China;Yuwu Mining Co.,Ltd.,Lu’an Group,Changzhi 046103,China)
出处
《煤矿安全》
CAS
北大核心
2020年第4期72-76,共5页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51574243)。
关键词
倾斜煤层
内外应力场
偏应力
非对称支护
矿压观测
inclined seam
internal and external stress field
deviation stress
asymmetric support
rock pressure observation
