Relevance between abutment pressure and fractal dimension of crack network induced by mining

作     者：Gao Mingzhong Jin Wencheng Dai Zhixu Xie Jing 

作者机构：State Key Laboratory of Hydraulics and Mountain River EngineeringSichuan University College of Hydraulic and Hydropower Engineering Sichuan University Energy&Chemical Industry Research InstituteShenma Group of Pingdingshan Coal Group College of Architecture and EnvironmentSichuan University 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2013年第23卷第6期

页      面：925-930页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 0709[理学-地质学] 0808[工学-电气工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：financial support from the State Key Basic Research Program of China(Nos.2011CB201201and 2010CB226802) the National Natural Science Foundation of China(No.51204112) 

主　　题：Advanced abutment pressure Fractal dimension Evolution Discrete element 

摘      要：Based on the geological conditions of coal mining face No.15-14120 at No.8 mine of Pingdingshan coal mining group,the real-time evolution of coal-roof crack network with working face advancing was collected with the help of intrinsically safe borehole video instrument.And according to the geology of this working face,a discrete element model was calculated by UDEC.Combining in situ experimental data with numerical results,the relationship between the fractal dimension of boreholes wall and the distribution of advanced abutment pressure was studied under the condition of mining advance.The results show that the variation tendency of fractal dimension and the abutment pressure has the same characteristic value.The distance between working face and the peak value of the abutment pressure has a slight increasing trend with the advancing of mining-face.When the working face is set as the original point,the trend of fractal dimension from the far place to the origin can be divided into three phases:constant,steady increasing and constant.And the turning points of these phases are the max-influencing distance(50 m)and peak value(15 m)of abutment pressure.