覆岩关键层结构失稳后的运动特征与“再稳定”条件研究  

Study on the movement characteristics and “re-stabilization” conditions of overlying key stratum structure after losing stability

作　　者：韩红凯 王晓振[1] 许家林[1] 吴玉华 季英明 HAN Hongkai;WANG Xiaozhen;XU Jialin;WU Yuhua;JI Yingming(School of Mines,State Key Laboratory of Coal Resources and Safety Mining,Key Laboratory of Deep Coal Resource Mining,Ministry of Education,China University of Mining ＆ Technology,Xuzhou,Jiangsu 221116,China;National Engineering Research Center of Coal Mine Water Hazard Controlling,Suzhou,Anhui 234000,China)

机构地区：[1]中国矿业大学矿业工程学院,煤炭资源与安全开采国家重点实验室,深部煤炭资源开采教育部重点实验室,江苏徐州221116 [2]国家煤矿水害防治工程技术研究中心,安徽宿州234000

出　　处：《采矿与安全工程学报》2018年第4期734-741,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51404246); 江苏省自然科学基金项目(BK20140205); 江苏高校优势学科建设工程项目(SZBF2011-6-B35)

摘　　要：工程实践中常存在关键层结构滑落失稳引起顶板台阶下沉而未压死支架的现象,为此建立了关键层结构滑落失稳后的力学模型,分析了关键层失稳块体的运动特征与"再稳定"条件。结果表明:关键层结构滑落失稳后顶板的滑落量并非一定会达到支架允许的顶板最大滑落量而压死支架,关键层失稳块体可能在压死支架前达到回转挤压稳定或触矸稳定状态而停止滑落。研究揭示了达到2种"再稳定"状态的条件。一定条件下,可在支架高度范围内保障合理的采高或提高支架阻力,使失稳块体达到回转挤压稳定状态防止压死支架。In engineering practices, the phenomenon that the step subsidence of the roof caused by the sliding destabilisation of key stratum structures without support crushing frequently exists. Hence, a mechanical model of the key stratum structure after sliding instability is established, the movement characteristics and ＂re-stabilization＂ conditions of the key stratum structure after losing stability are analyzed. The results show that the roof subsidence caused by the instability of the key stratum structure may not always exceed the threshold that crushes supports. Alternatively, the unstable block of the key stratum may stop sliding by reaching the stability of rotation squeezing or touching the falling rocks before crushing the support. Two ＂re-stabilization＂ conditions are revealed. Under certain conditions, maintaining rational mining height within support capability or increasing support resistance to make the unstable block reaching the rotation squeezing stability is put forward so as to prevent crushing the support.

关 键 词：关键层 滑落失稳 再稳定 压架 失稳块体 

分 类 号：TD323[矿业工程—矿井建设]