Evolution of a mining induced fracture network in the overburden strata of an inclined coal seam  

作　　者：Wei Xiujun Gao Mingzhong Lv Youchang Shi Xiangchao Gao Hailian Zhou Hongwei 

机构地区：[1]Institue of Energy & Chemical Industry,China Pingmei Shenma Group [2]School of Hydraulic and Hydropower Engineering,Sichuan University [3]State Key Laboratory of Coal Resources and Safe Mining,China University of Mining & Technology

出　　处：《International Journal of Mining Science and Technology》2012年第6期775-779,共5页矿业科学技术学报（英文版）

基　　金：the financial support from the State Key Basic Research Program of China(No.2011CB201201)

摘　　要：The geological conditions of the Pingdingshan coal mining group were used to construct a physical model used to study the distribution and evolution of mining induced cracks in the overburden strata.Digital graphics technology and fractal theory are introduced to characterize the distribution and growth of the mining induced fractures in the overburden strata of an inclined coal seam.A relationship between fractal dimension of the fracture network and the pressure in the overburden strata is suggested.Mining induced fractures spread dynamically to the mining face and up into the roof as the length of advance increases.Moreover,the fractal dimension of the fracture network increases with increased mining length,in general,but decreases during a period from overburden strata separation until the main roof collapses.It is a1so shown that overburden strata pressure plays an important role in the evolution of mining induced fractures and that the fractal dimension of the fractures increases with the pressure of the overburden.The geological conditions of the Pingdingshan coal mining group were used to construct a physical model used to study the distribution and evolution of mining induced cracks in the overburden strata.Digital graphics technology and fractal theory are introduced to characterize the distribution and growth of the mining induced fractures in the overburden strata of an inclined coal seam.A relationship between fractal dimension of the fracture network and the pressure in the overburden strata is suggested.Mining induced fractures spread dynamically to the mining face and up into the roof as the length of advance increases.Moreover,the fractal dimension of the fracture network increases with increased mining length,in general,but decreases during a period from overburden strata separation until the main roof collapses.It is a1so shown that overburden strata pressure plays an important role in the evolution of mining induced fractures and that the fractal dimension of the fractures increases with the pressure of the overburden.

关 键 词：Inclined coal SEAM Fracture network EVOLUTION FRACTAL DIMENSION 

分 类 号：TD32[矿业工程—矿井建设]