厚松散层综放开采覆岩破坏发育规律研究  

Study on Overburden Failure Development Laws of Thick Unconsolidated Strata in Fully Mechanized Caving Mining

作　　者：董检平 李江华[1] 姚曹节[2] 高玉兵 梁树平[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]淮北矿业股份有限公司朱仙庄煤矿,安徽宿州234111

出　　处：《煤矿安全》2015年第9期47-50,共4页Safety in Coal Mines

摘　　要：为了确保朱仙庄煤矿综放工作面在回采过程中不受上覆含水层的影响,尽可能提高工作面的开采上限,合理留设安全煤(岩)柱厚度,采用地面钻孔观测法、井下网络并行电法仪探测法以及数值模拟,对厚松散层综放开采覆岩破坏高度发育规律进行研究。结果表明:地面钻孔实测垮采比为4.14,裂采比为9.74,与电法探测结果相近;同一煤层开采后垮采比和裂采比也有一定的变化,一般随着采高的增大而出现小幅度的增大;随着工作面的推进,覆岩破坏由下而上逐渐发展,最大主应力中拉应力的等值线由"拱形"变为"马鞍形",导水裂缝带在在煤壁前方和工作面后方发育最高,需要重点防范其波及到上方的含水层。To ensure fully mechanized caving face in the mining process free from the overlying aquifer influence in Zhuxianzhuang Coal Mine,Maximize the exploitation of the face as high as possible,coal pillar should be remained in reasonable safety thickness. Ground drilling observation method,underground electrical network parallel instrument detecting method along with the discrete element numerical simulation are adopted to study the law of fully mechanized caving thick unconsolidated strata height growth. The result shows that caving- height ratio from the measured is 4. 14,and crack and mining ratio is 9. 74. The results from the two detecting methods are basically consistent; there are certain differences between the caving- height ratio and the crack and mining ratio after the same seam mining,generally appearing small amplitude increases with the increase of mining height; with the advancing of working face,overburden failure evolved from the bottom to top,the equivalent lines of tensile stress of the maximum principal stress turn ＂ arch＂ to ＂ saddle＂,and water flowing fractured zone is the highest in front of coal wall and after the face,attention should be paid to prevent the aquifer damaged.

关 键 词：厚松散层 综放开采 覆岩破坏高度 垮采比 裂采比 

分 类 号：TD823.494[矿业工程—煤矿开采]