摘要
针对某深井煤矿采区泵房及变电所过断层巷道出现的顶板剧烈下沉、两帮内挤严重、底板鼓量大的现象,通过现场调研、数值模拟及现场监测,分析了原有支护方案下过断层巷道围岩变形破坏机制,提出采用高强锚杆+注浆锚索联合支护方案。结果表明:深部高地应力、断层局部应力集中及剪切滑移破坏、支护强度不足等是过断层巷道围岩变形破坏的主因;注浆锚索能够有效控制围岩破碎区范围,联合高强锚杆调动深部围岩形成稳定支撑结构。现场位移监测结果表明,优化支护方案后巷道过断层位置处不连续变形得到了较好的控制,整体变形量大幅度降低,改善了围岩应力水平。
Severe roof subsidence, serious internal extrusion of two sides and large floor heave exsist in the fault crossing roadway of pump house and substation in a deep coal mine. In view of above phenomenon, through field investigation, numerical simulation and field monitoring, the surrounding rock deformation and failure mechanism of the fault crossing roadway under the original support scheme was analyzed. Then, the combined support scheme of high-strength bolt and grouting anchor cable was proposed. The results show that, high ground stress in deep, local stress concentration and shear slip failure of fault, as well as insufficient support strength are the main causes of surrounding rock deformation and failure. Grouting anchor cable can effectively control the range of fracture area in surrounding rock, and a stable support structure would be formed by combining with high-strength anchor to mobilize deep surrounding rock. The field displacement monitoring results show that, the discontinuous deformation of the fault crossing roadway can be well controlled, the overall deformation is greatly reduced, and the stress level of surrounding rock is improved.
作者
赵伟
傅航
宋彦琦
马宏发
李向上
ZHAO Wei;FU Hang;SONG Yanqi;MA Hongfa;LI Xiangshang(Henan Longyu Energy Co.,Ltd,Yongcheng,Henan 476600,China;College of Mechanics and Architectural Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《矿业研究与开发》
CAS
北大核心
2021年第7期129-134,共6页
Mining Research and Development
基金
国家重点研发计划课题(2018YFC0808402)
国家自然科学基金联合基金资助项目(U1704242)
中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室开放基金课题(SKLGDUEK2017)。
关键词
巷道
断层
数值模拟
围岩控制
支护优化
Roadway
Fault
Numerical simulation
Surrounding rock control
Support optimization
