俯采采场顶板破断运动特征和矿压显现规律研究  

Study on the Roof Movement Features and Strata-pressure Behavior of Downdip Mining Stope

作　　者：黄继辉[1,2] 王连国[1] 周冬磊[1,2] 王占盛[1,2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州市221008 [2]中国矿业大学力学与建祝工程学院,江苏徐州市221008

出　　处：《矿业研究与开发》2012年第2期22-25,79,共5页Mining Research and Development

基　　金：国家重点基础研究发展计划(973)项目(2010CB226805);国家自然科学基金项目(50874103);江苏省自然科学基金项目(BK2008135)

摘　　要：为研究俯采采场顶板破断运动特征和矿压显现规律,对袁店某矿7211俯采工作面进行了矿压监测,分析了工作面液压支架支护阻力的循环变化规律及支架的适应性。建立了俯采采场老顶初次破断和周期破断力学模型,得出了破断准则和破断步距理论计算式。采用UDEC软件模拟了7211工作面推进过程中顶板运动破坏和煤壁稳定性规律。研究表明:俯斜开采时沿层向分力与煤壁压缩变形位移方向相反,煤壁稳定性增强;层向分力使直接顶压裂裂隙受到挤合,其整体性得到加强,俯采有利于顶板管理。研究结果为今后类似条件下开采、巷道布置与支架选型提供了科学、可靠的依据。In order to study the roof movement features and strata-pressure behavior of downdip mining stope,based on mine pressure monitoring of 7211 down-dip working face in Yuandian coal mine,the change law of support resistance and the adaptability of hydraulic support were investigated.The mechanical models for the first breaking and the periodic breaking of the main roof of downdip mining stop were established.The theoretical formulae for the breaking criterion and span of main roof were derived.The law of roof movement and failure of the 7211 downdip working face during advancing were researched by UDEC software.The results indicated that when the downdip mining was adopted,the direction of the component force along the dip direction of seam was opposite to that of the displacement of compressive deformation of the coal wall,so the coal rib was more stable;and the component force along the dip direction of seam made the compression cracks in the immediate roof closed,enhancing the wholeness of roof and being beneficial to roof management.All these studies provided a reliable scientific basis for mining,roadway layout and support design under the similar conditions in the future.

关 键 词：俯斜开采 顶板运动 矿压显现 理论分析 数值模拟 

分 类 号：TD322.1[矿业工程—矿井建设]