浅埋近距离煤层重复采动关键层结构失稳机理研究  

Study on the instability mechanism of key strata structure in repeating mining of shallow close distance seams

作　　者：朱卫兵[1] 

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《煤炭学报》2011年第6期1065-1066,共2页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50974116);国家重点基础研究发展计划(973)资助项目(2007CB209403);教育部"新世纪优秀人才支持计划"资助项目(NCET-05-0478);教育部博士点基金资助项目(20070290513)

摘　　要：神东矿区随着开采规模的不断加大,部分区域的第1层主采煤层已采完,开始回采第2层主采煤层。由于两层煤间距较小,形成了浅埋近距离煤层重复采动的开采条件,在一些特殊的地质采矿条件下,下煤层采场矿压显现异常强烈,工作面曾发生多起支架活柱瞬间大幅下缩甚至压死支架等动载矿压现象,严重威胁着煤矿安全高效生产。论文综合采用理论分析、数值模拟与物理模拟试验、现场实测等方法,就神东矿区浅埋近距离煤层重复采动关键层结构失稳与动载矿压机理进行了深入研究。With the successive exploration of Shendong mining area,the exploration of the 2nd main mineable coal seam had been started in some area where the 1st seam had been explored.Due to the close distance of the two seams,the specific condition of repeating mining in close distance shallow seams had formed,specifically in some particular area,the strata behaviors of the lower seam are intense,and this can be seen from the multiple cases of instant descending of support active column and supports crushing,which has severely threatened the mine safety and its efficient production.Further research on instability mechanism of key stratum structure in close distance shallow seams repeating mining were studied by using theoretical analysis,numerical simulation,physical simulation,and field test etc. Key stratum of close distance shallow seams were classified into three kinds or four forms for the first time,that is the single key stratum structure including the thick,hard single key stratum structure and composed single key stratum structure,no typical key stratum structure,and multiple key stratum structure while the upper seam had excavated;instability characteristics of single key stratum in shallow seams while the upper was been excavated and its occurring condition was analyzed.Uphill mechanical model was established,through which the influence of horizontal side force on the stability of single key stratum in shallow seams while the upper had been excavated and the main key stratum had been eroded was studied,the instability mechanism of single key stratum while the upper had been excavated and the surface was gullied was revealed,influencing factors of dynamic strata behaviors were summarized.The key stratum structure mechanical model while crossing the pillar in close distance shallow seams was established,through which the influence of movement of key stratum block of upper seam on the key stratum stability of lower seam was analyzed,the instability mechanism of single key stratum while the upper seam had been exca

关 键 词：浅埋 近距离煤层 关键层 动载矿压 沟谷地形 煤柱 

分 类 号：TD353[矿业工程—矿井建设]