硬厚顶板破断结构演化及冲击危险区分析  

Evolution of broken structure of hard thick roof and analysis of impact hazard area

作　　者：吕鹏飞 崔学凯 苗壮 路康斌 耿伊健 LYU Pengfei;CUI Xuekai;MIAO Zhuang;LU Kangbin;GENG Yijian(College of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学矿业与煤炭学院,内蒙古包头014010

出　　处：《煤矿安全》2024年第8期108-115,共8页Safety in Coal Mines

基　　金：国家自然科学基金地区科学基金资助项目(52064043);内蒙古自治区自然科学基金面上资助项目(2023MS05028);内蒙古自治区直属高校基本科研业务费资助项目(2023QNJS092)。

摘　　要：针对硬厚顶板破断及结构演化对工作面冲击显现的影响,以东滩煤矿63上05工作面硬厚顶板条件为背景,运用理论分析和数值模拟分析了硬厚顶板破断失稳的临界条件及其结构演化过程,并划分工作面冲击危险区域。结果表明:顶板厚度和强度与块体破断时端部垂直载荷成正比,直接顶与基本顶的结构形态由“V”形演化成“U”形;顶板初次和周期跨落步距相较于常规情况明显增大,且基本顶结构演化较直接顶具有迟滞性;顶板垂直应力以应力拱形式演化,开采过程中在采空区中形成多处应力集中。基于研究结果,划分63上05工作面冲击危险区域并利用微震监测技术验证准确性。Aiming at the influence of hard and thick roof fracture and structural evolution on the impact of working face,taking the hard and thick roof condition of 63 upper 05 working face in Dongtan Coal Mine as the engineering background,the critical condition and structural evolution process of hard and thick roof fracture and instability are studied by theoretical analysis and numerical simulation,and the dangerous area of working face impact is divided.It is concluded that the thickness and strength of the roof are proportional to the vertical load at the end of the block breaking.The structure of immediate roof and main roof gradually evolved from“V”type to“U”type.The first and periodic steps of the double hard thick roof increase obviously compared with the conventional condition,and the evolution of the basic roof structure is more retarded than that of the direct roof.The vertical stress of the roof evolves in the form of stress arch,and many stress concentration phenomena are formed in the mined-out area during mining.Based on the above research results,the impact danger area of 63 upper 05 working face was divided and the accuracy was verified by microseismic monitoring technology.

关 键 词：冲击地压 硬厚顶板 顶板结构 覆岩破断 危险区划分 

分 类 号：TD324[矿业工程—矿井建设]