摘要
为实现无煤柱自成巷开采条件下短臂梁顶板结构安全稳定,研究短臂梁顶板结构平衡机制及其动态演化机制,明确锚索的补偿支护作用机制,利用Hoek-Brown强度准则和塑性力学中的上限分析方法分析锚索支护作用下短臂梁顶板围岩的冒落破坏机制,推导短臂梁顶板在摩擦垮落、动压影响、成巷稳定3个阶段的锚索补偿支护力计算公式,形成无煤柱自成巷短臂梁顶板补偿支护力设计方法。在此基础上,建立敏感性分析指标,分析不同参数对锚索补偿支护力的影响程度。研究表明:围岩应力、切缝参数、巷道宽度是锚索补偿支护力的主控因素,其中围岩应力为最敏感指标,据此提出短臂梁顶板稳定性控制相关工程建议。研究成果在新泰煤矿N00工法5101工作面运输巷进行了应用,现场应用效果良好。
In order to realize the safety and stability of the short arm beam roof structure in non-pillar mining with automatically formed roadway.The balance mechanism and dynamical evolution of the roof structure of the short-arm beam are analyzed,and the mechanism of compensating the support of the anchor cable is clarified.The Hoek-Brown strength criterion and the upper bound analysis method in plastic mechanics are used to analyze the caving failure mechanism of the surrounding rock of the short arm beam roof under the support of the anchor cable.Therefore,the calculation formula of anchor cable compensation support force of short arm beam roof in three stages of caving friction,dynamic pressure effect and roadway stability is deduced.In addition,a method for compensating the support force of a short arm beam roof in a self-forming roadway without coal pillars is developed.On this basis,the sensitivity analysis index is established and the influence of different parameters on the compensation support force of the anchor cable is analyzed.It is demonstrated that the surrounding rock stress,roof cutting parameters and roadway width are the main control factors for cable compensation support forces,with the surrounding rock stress being the most sensitive metric.Thus,the engineering suggestions for the stability control of short arm beam roof are put forward.The research results were applied in the transportation roadway of 5101 working face of N00 mining method in Xintai Coal Mine,and good effect of field application was verified.
作者
杨军
刘奔
周鹏
黄龙
张俊
侯世林
王亚军
陈菲
YANG Jun;LIU Ben;ZHOU Peng;HUANG Long;ZHANG Jun;HOU Shilin;WANG Yajun;CHEN Fei(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Shanxi Bureau of National Mine Safety Administration,Taiyuan,Shanxi 030012,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;Shenmu Ningtiaota Mining Co.,Ltd.,Shaanxi Coal and Chemical Industry Group Co.,Ltd.,Yulin,Shaanxi 719300,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2023年第4期798-809,共12页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(52074298,51904207)
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课题基金项目(XD2021023)。
关键词
采矿工程
无煤柱自成巷
切顶短臂梁
上限法
锚索设计
影响因素
mining engineering
non-pillar mining with automatically formed roadway
roof-cut short arm beam
upper bound method
anchor cable design
influence factor
