辽宁三台子水库下特厚煤层综放开采覆岩破坏特征  

Failure rules of overburden strata in fully-mechanized sublevel caving mining of specially thick coal seam of Daping mine

作　　者：冯国财[1] 李强[2] 孟令辉[3] 

机构地区：[1]辽宁经济职业技术学院科研处,辽宁沈阳110122 [2]沈阳煤炭科学研究所采矿室,辽宁沈阳110015 [3]铁煤集团公司大平煤矿,辽宁沈阳112600

出　　处：《中国地质灾害与防治学报》2012年第4期76-80,共5页The Chinese Journal of Geological Hazard and Control

摘　　要：为确保水库下特厚煤层综放开采安全,合理留设防水安全煤岩柱,大平煤矿采用钻孔冲洗液耗失量法对覆岩破坏进行了观测研究。经对7个工作面测站12个覆岩破坏观测钻孔实测资料分析研究得出:煤层采出厚度7.54～15.17m,工作面推过36～40d,滞后工作面距离110～120m时覆岩破坏发育最充分。实测导水裂缝带高度为采高的15.31～19.97倍,明显大于类似软弱覆岩地层条件普通长壁全陷法开采覆岩破坏导水裂缝带发育高度。导水裂缝带上方,明显有集中发育的离层破碎带存在,实测离层破碎带高度为181.58～390.75m,是采高的24.22～36.00倍。Overburden strata＇s failure was observed through measuring the loss of drilling rinses to protect the fullymechanized sublevel caving mining of specially thick coal seam. Based on the data of the 12 drillings of 7 working face, concluded that the overburden strata＇s water flowing fractured zone fully developed after the working face had passed 36 40d while the lag working face distance was 110 - 120m under the situation that the mining thickness was 7.54 - 15. 17m and the average moving speed was 3m/d. The height was 148.23 - 234.10m which was 15.31 - 19.97 times of the mining thickness. Overburden strata＇s separation and failure developed to become a band above the water flowing fractured zone. The height was 181.58 - 390.75m which was 24.22 -36.00 times of the mining thickness.

关 键 词：特厚煤层 综放开采 覆岩破坏 冲洗液耗失量 防水煤岩柱 

分 类 号：TD823.254[矿业工程—煤矿开采]