摘要
祁东矿南部采区集中运输上山距DF8逆断层端部最小距离仅7 m,巷道发生严重破坏,通过现场勘查详细描述了围岩和支护结构的破坏特征,结合实测地应力数据采用数值模拟详细阐述了断层在水平和垂直剖面内的模拟方法,重点研究了断层不同端部位置产生的应力集中对巷道变形的影响,得出巷道靠近断层一侧的顶板、腰部和底板呈现非对称变形特征,采用锚杆锚索非对称布置的支护方式有效地修复了巷道。
The centralized haulage roadway in Qidong coal mine was subject to serious damage and deformation. The most serious damage occurred in the area close to the fault tip DF8 with the minimum in-between distance of 7 m. In this study, the features of the roadway instability affected by the DF8 thrust fault were described in details based on site investigation and field observation. According to the result of in-situ stress measurement, a numerical modelling was performed to further explore the defor- mation failure mechanism of the ground after excavation. Meanwhile, great emphasis was put on the modelling method of the fault on the horizontal and vertical section. The results have indicated that asymmetric deformation appears remarkably at the crown, the floor and the sidewall nearby the fault. Finally, the upgraded support design of asymmetric arrangement of rock bolt and anchor cable is put forward, which proves successful in rehabilitating the roadway.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2017年第3期472-478,共7页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2014CB046301)
国家自然科学基金项目(51204168)
江苏省科技计划项目(BK20140051)
关键词
巷道失稳
断层模拟
端部应力集中
围岩变形机理
非对称锚杆支护
roadway instability
fault simulation
stress concentration nearby fault ends
grounddeformation and failure mechanism
asymmetric rock bolt support
