长壁工作面覆岩采动裂隙网络演化特征  

Evolution of mining-induced crack network in overburden strata of longwall face

作　　者：周宏伟[1] 张涛[1] 薛东杰[1] 薛俊华[2] 

机构地区：[1]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083 [2]淮南矿业集团深部煤炭开采与环境保护国家重点实验室,安徽淮南232001

出　　处：《煤炭学报》2011年第12期1957-1962,共6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(2011CB201201);国家自然科学基金资助项目(51134018);国家科技支撑计划课题资助项目(2008BAB36B07)

摘　　要：以淮南张集矿1122(1)工作面为原型,制作了相似材料模型。结合分形几何理论研究了覆岩采动裂隙的分布及发育特征,并分析了覆岩采动裂隙长度与数量的分维与工作面推进长度之间的关系。研究发现:采动裂隙总数随着工作面推进长度增大而增大,且在主关键层弯曲前,裂隙总数逐渐增多;主关键层弯曲后,导致采空区中部部分裂隙闭合,而新生裂隙则不断增加。On the basis of geological conditions of coal mining face No.1122（1） at Zhangji Coal Mine,Huainan Mining Group Corporation,a physical model was constructed.A fractal theory was introduced to characterize distribution and growth of mining-induced cracks in overburden strata.A relation between fractal dimensions of length-number of mining-induced cracks and advancing lengths of coal mining face was investigated.It is indicated that the total number of mining-induced cracks increases with the increasing of advanced lengths of mining face.Moreover,the number of mining-induced cracks increases gradually before breaking of the main key stratum.In addition,the breaking of the main key stratum results in the closing of some cracks in the center of the goaf and the generating of new cracks

关 键 词：长壁工作面 采动裂隙 物理模拟 分形维数 

分 类 号：TD856.113[矿业工程—金属矿开采]