中等含水层下留设防砂煤柱开采的试验与研究  

Study and trial on explitation of retaining safety coal pillar against sand under medium-thickness aquifer layer

作　　者：杨本水[1] 王从书[2] 阎昌银 

机构地区：[1]安徽理工大学资源开发与管理工程系,安徽淮南232001 [2]皖北煤电集团公司任楼煤矿,安徽宿州234001

出　　处：《煤炭学报》2002年第4期342-346,共5页Journal of China Coal Society

摘　　要：百善煤矿主采煤层上方直接覆盖有 2 2～ 2 7m的砂砾石含水层 ,严重威胁矿井的安全生产 .为了安全合理地开采 ,进行了矿区水文地质和上覆岩层岩石力学、水理性质以及“两带”高度试验 .结果表明 :含水层内含黏量较高 ,垂直渗透能力较弱 ;所留煤柱属软弱或极软弱类型 ;风化带内黏土矿物含量较大 ;吸水后体积膨胀 ,再生隔水能力强 ;受采动影响后 ,具阻水和抑制导水裂隙带继续发展的双重作用 ;根据以上研究结果 ,取得了将垂高 5 0m的防水煤柱缩小到 12～ 2 0m防砂、防塌煤柱的技术突破 ,安全地多采煤 6 0 0多万t。The main target coal seam of Baishan Mine is directly covered with a 22～27 m thick gravel aquifer, which seriously threatens the safety of mine. To demonstrate the safety and reliability of coal pillar, the tests for hydrogeological conditions of mining area, rock mechanics, water rocks physicals properties and highness of 'two belt' are conducted. As a result, the gravel layer is of higher volume of cementing clay materials, weak ability of vertical permeation ; Safety coal pillar retained under sand bodies belongs to more loose and most loose rock type. The content of clay minerals in weathered zone of basement is relatively high, resulting strong regenerating watertightness due to volume dilatation after water absorbing which is of double functions of watertight and restraining continuous development of producing fractures under mining impact conditions. The research shows breakthrough that a 50 m coal pillar against sand has been thinned to 12～20 m safety coal pillar. The sum of safety produced coal increased 6 0 Mt.

关 键 词：防砂煤柱 综采工作面 防水煤岩柱 含水层下采煤 风化带 矿井 覆岩 导水裂隙带 

分 类 号：TD823.83[矿业工程—煤矿开采]