急倾斜煤层开采覆岩变形分析及其应用  

Deformation analysis of covering rock masses as mining steep-inclined coal seam and its application

作　　者：马亚杰[1,2] 武强[1] 洪益清[1,3] 郭立稳[2] 田洪胜[2] 张丽阁[2] 

机构地区：[1]中国矿业大学(北京)水害防治与水资源研究所,北京100083 [2]河北理工大学资源与环境工程学院,河北唐山063009 [3]开滦(集团)有限责任公司,河北唐山063000

出　　处：《煤炭学报》2009年第3期320-324,共5页Journal of China Coal Society

摘　　要：分析了碎屑结构煤系地层岩体变形破坏的岩体力学特征及断裂带导水机理,认为岩体体积扩容是工作面顶板破坏内导水性增强、形成导水断裂带的根本原因.应用FLAC3D模拟分析了连续介质、大变形条件下急倾斜特厚煤层开采引起的覆岩体积应变分区特征,分为连续介质条件下的内部塑性破坏-压缩区、扩容区及外部弹性压缩区.依据垮落带形成过程中的体积变化特征,将连续介质条件下获得的内部塑性破坏-压缩区划为垮落带;扩容区划为断裂带;以分隔扩容区与外部弹性压缩区的体积应变0等值线最大高度确定防水煤柱高度.此方法应用于开滦赵各庄2137急倾斜特厚煤层开采工作面,确定上部防水煤柱高度为63.8 m.Mechanics characteristics of covering rock masses was analyzed, which as coal measures strata and with fragment texture, and the water conduction mechanism of the fractured zone. It was shown that the volumetric dilation was really in charge of fractured zone transmissibility increase and water-flowing fractured zone formation in workface roof. On the assumption of continuum, the volumetric strain characteristics of rock masses covering on the steep-inclined coal seam were analyzed under the condition of large deformation with the FLAC^3D software. Three zones were divided including internal plastic-failure-compression zone under the condition of continuum, dilation zone and external elastic compression zone. According to the volume change characteristics of caving zone in its forming process, the internal plastic compression zone was regard as caving zone. Dilation zone was the fractured zone. The maximum height of the contour of zero volumetric strain, which separating dilation zone from the external elastic compression zone, was regard as the height of coal column for water-proofing. With this method, the height of waterproofing coal column in 2137 workface in Kailuan Zhaogezhuang Coal Mine was determined as 63.8 m.

关 键 词：急倾斜煤层 垮落带 导水断裂带 防水煤柱高度 体积应变 

分 类 号：TD823.213[矿业工程—煤矿开采]