浅埋煤层长壁开采围岩应力场特征研究  

Study on characteristic of stress field in surrounding rocks of shallow coalface under long wall mining

作　　者：任艳芳[1,2,3] 齐庆新[1,3,4] 

机构地区：[1]煤炭科学研究总院开采设计研究分院,北京100013 [2]天地科技股份有限公司开采设计事业部,北京100013 [3]煤炭科学研究总院煤炭资源高效开采与清净利用国家重点实验室,北京100013 [4]煤炭科学研究总院矿山安全技术研究分院,北京100013

出　　处：《煤炭学报》2011年第10期1612-1618,共7页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2010CB226806);国家科技支撑计划资助项目(2008BAB36B01;2008BAB36B12)

摘　　要：利用数值模拟及现场观测,研究了浅埋深长壁工作面围岩应力场特征,得出上覆岩层中可形成承压拱结构,该结构能否稳定存在直接关系到工作面矿压显现,并提出将承压拱结构能否稳定存在作为判别某一煤层是否为浅埋煤层的方法。分析了采高和工作面长度对承压拱结构稳定性的影响程度,结果表明:采高对承压拱结构的临界高度及结构稳定性影响十分显著,当采高达到一定值后,上覆岩层中不能形成稳定的承压拱结构;工作面长度对于承压拱结构的稳定性具有很大影响,但当工作面达到一定临界长度时,再加长工作面对覆岩结构稳定性影响程度降低。The features of stress field of surrounding rocks through on-site observation and numerical modeling was studied.The conclusions indicate that whether the pressure arch structure can form in the overburden or be stable are the key factor on shallow coal seam definition.The studies of the influence of cutting height and face length on stability of the pressure arch structure were done.The results show that the critical height of ＂pressure arch＂ overburden structure can be different under the mining condition of different mining height and different face length.When the mining height reaches a certain value,the ＂pressure arch＂ structure can not form in overlying rock.The face length plays a greater impact on overburden structure stability too.But after the face length reaches a certain value,the increase of face length can not make greater impact on structure stability.

关 键 词：浅埋煤层 长壁开采 围岩应力 覆岩结构 承压拱 数值模拟 

分 类 号：TD823.4[矿业工程—煤矿开采]