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

Zhou Hongwei●Zhang Tao●Xue Dongjie●Xue Junhua

Abstract

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.

长壁工作面覆岩采动裂隙网络演化特征

周宏伟，张涛，薛东杰，薛俊华

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*隙闭合，而新生裂隙则不断增加。

引用格式：

Zhou HW, Zhang T, Xue DJ, Xue JH. Evolution of mining-induced crack network in overburden strata of longwall face[J]. Journal of China Coal Society, 2011, 36(12): 1957–1962. 周宏伟, 张涛, 薛东杰, 薛俊华.长壁工作面覆层采动裂隙网络演化特征研究[J]. 煤炭学报, 2011, 36(12): 1957–1962.

EI：20120714773728   DOI：10.13225/j.cnki.jccs.2011.12.004

文章连接地址：

http://www.mtxb.com.cn/CN/Y2011/V36/I12/1957