采场覆岩厚关键层破断与冒落规律分析.pdfVIP

第24 卷 第 8 期 岩石力学与工程学报 Vol.24 No.8 2005 年 4 月 Chinese Journal of Rock Mechanics and Engineering April ，2005 采场覆岩厚关键层破断与冒落规律分析 缪协兴，陈荣华，浦 海，钱鸣高 ( 中国矿业大学 理学院，江苏 徐州 221008) 摘要：具有良好分层性的采场覆岩破断规律已被基本掌握，但对于厚关键层(特厚层砂岩老顶)覆岩的采场矿压规律 还需深入研究。运用岩体破裂过程分析系统，结合某矿区实际覆岩构造特征，分析了具有厚关键层的采场覆岩的 破断与冒落规律。研究表明：厚关键层的破断、垮落规律与长梁(或薄板)矿压理论存在根本差异，其初次破断与冒 落形态为拱形，周期破断与冒落呈不等长的短块状。厚关键层来压具有多样性和随机性，不同形式的采场来压对 支架的作用不同，大块滑落失稳对采场支架的威胁最大，对采场矿压控制提出了严峻的挑战。该研究成果为实际 采矿设计与矿压控制提供了理论依据。 关键词：采矿工程；厚关键层；关键层理论；破断分析；采场矿压 中图分类号：TV 641.2 文献标识码：A 文章编号：1000 –6915(2005)08 –1289 –07 ANALYSIS OF BREAKAGE AND COLLAPSE OF THICK KEY STRATA AROUND COAL FACE MIAO Xie-xing ，CHEN Rong-hua ，PU Hai ，QIAN Ming-gao (School of Science ，China University of Mining and Technology，Xuzhou 221008 ，China) Abstract ：The regular behavior of weighting and caving of well-layered strata around coal face，with many thin overlying layers，is studied，and the rock pressure caused by the caving is relatively easy to control. But the caving and rock pressure of very thick sand overlying strata，the thick key strata ，is very complicated and needs further study. The breakage and collapse of thick key strata(super thick roof of sand rock ) around coal face，with real geological conditions from a coal mine borehole columnar section，is studied by a computer grogram，rock fracture process analysis(RFPA). The results show that there are basic differences of the breakage and collapse between thick key strata and thin strata (or long beams). The shape of the first breakage and collapse of thick key strata is an arch，and the periodic breakage and collapse is in short blocks with different lengths. The roof of t