特厚煤层大采高综放工作面端部覆岩活动规律研究  

Study on overburden strata movement law at face end of high cutting fully-mechanized top coal caving face in ultra thick seam

作　　者：匡铁军[1] 

机构地区：[1]大同煤矿集团有限责任公司塔山煤矿,山西大同037000

出　　处：《煤炭科学技术》2016年第6期188-193,共6页Coal Science and Technology

基　　金：国家自然科学基金煤炭联合基金资助项目(U1261207)

摘　　要：为了研究特厚煤层大采高综放工作面能否采用小煤柱沿空掘巷技术,以塔山煤矿特厚煤层8204大采高综放工作面为工程背景,采用地表下沉量观测、微震观测和理论分析的方法研究了大采高综放工作面端部覆岩活动范围、裂隙场分布、运动特征及结构特征。结果表明：15 m特厚煤层大采高综放工作面垮落带高度为43 m,断裂带高度为43~200 m,200 m以上岩层处于弯曲下沉带内;大采高综放工作面端部以垮落角、移动角为边界形成滑移破裂区、拉压裂隙区和压裂隙区3个裂隙发育区;采空区稳定前工作面端部形成＂下位悬臂梁-上位砌体梁＂结构,随着工作面推进,覆岩进一步运动下沉,采空区稳定后下位悬臂梁破断,形成三角形滑移区,上位关键层仍以砌体梁结构方式存在,并控制侧向应力场的分布。In order to study the gateway driving technology along the goaf whether could apply to or not to the high cutting fully- mechanized top coal caving mining face in ultra thick seam,based on No. 8204 high cutting fully- mechanized top coal caving mining face in ultra thick seam of Tashan Mine as an engineering background,a surface ground subsidence observation,micro seismic observation and theoretical analysis method were applied to the study on the overburden strata movement range,the cracks field distribution,the movement features and structure features. The results showed that height of the roof falling zone in high cutting fully- mechanized top coal caving mining face in ultra thick seam with a thickness of 15 m was 43 m,the height of cracks zone was 43 ~ 200 m and rock strata over 200 m above coal mining face was in a bending and subsidence zone. With the roof falling angle and moving angle as boundary,three crack development zones,including the sliding breaking zone,tension and compression crack zone and compression crack zone formed at the end of high cutting fully- mechanized top coal caving mining face. Before the goaf stabilized,a ＂ low cantilever beam- upper bricks lined beam＂ structure was formed at the end of coal mining face. With the coal mining face pushed forward,the overburden strata would be further moved and subsided. After the goaf stabilized,the low cantilever beam would be broken and a delta sliding zone was formed. The upper key layer would be still existed with mode of bricks lined beam structure and could control the distribution of the lateral stress field.

关 键 词：特厚煤层 大采高综放工作面 覆岩运动 端部结构 

分 类 号：TD325[矿业工程—矿井建设]