EH-4在复杂巨厚煤层覆岩破坏范围确定中的应用  

Application of determining overburden failure range in complex giant thick coal seam by EH-4 magnetotelluric method

作　　者：张宏伟[1] 荣海[1] 韩军[1] 高照宇[1] 杜凯[1] 

机构地区：[1]辽宁工程技术大学矿业学院,阜新123000

出　　处：《地球物理学进展》2014年第5期2307-2313,共7页Progress in Geophysics

基　　金：国家自然科学基金(51274117);国家自然科学基金(51104085);辽宁省教育厅基金资助项目(L2012106)

摘　　要：为了确定老虎台矿复杂巨厚煤层不同开采阶段,导水裂隙带及离层空间等覆岩破坏范围及其演化规律,以63005工作面所在区域为研究对象,采用EH-4大地电磁法,对研究区域水砂充填开采阶段和综采放顶煤开采阶段覆岩破坏高度分别进行探测,确定了覆岩破坏高度与采出厚度间的关系;分别采用理论计算和数值模拟方法对探测结果进行了验证.研究结果表明,63005工作面开采前,即水砂充填开采阶段,三分层顶板岩层破坏高度范围为120-170m;工作面开采后,即综采放顶煤开采阶段,相同区域破坏高度达到150-220m;无论在水砂充填开采阶段还是综采放顶煤开采阶段,老虎台矿复杂巨厚煤层覆岩破坏平均高度为等效采厚的7.4倍;63005工作面开采过后,F18断层的上下盘之间出现了离层结构.In order to determine overburden failure range and evolution of water flowing fractured zone and separated strata space in complex giant thick coal seam conditions in different mining phases of Laohutai coal mine,panel 63005 area is taken as the object of study.EH-4 magnetotelluric method is used to determine failure range in different mining phases,theoretical calculation and numerical simulation are employed to verify the results. The results show that failure height of the 3rd stratified roof rock is 120 m to 170 m before panel 63005 mining,and the height of the same place turns to 150 m to 220m after panel 63005 mining.The overburden failure height is 7.4 times the thickness of equivalent mining on average in complex giant thick coal seam conditions of Laohutai coal mine no matter in the sand fill mining stage or fully mechanized sublevel caving stage.Bed separation structure appears on F18 Fault after panel 63005 mining at the same time.

关 键 词：复杂巨厚煤层 覆岩破坏 EH-4大地电磁法 离层结构 

分 类 号：P631[天文地球—地质矿产勘探] P823[天文地球—地质学]