[1] School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan,Anhui,232001, China
[2] Research Center of Mine Underground Engineering of Ministry of Education, Anhui University of Science and Technology, Huainan,Anhui,232001, China
[3] Office of the Chief Engineer, State Development & Investment Corporation Xinji Energy Company Limited, Huainan,Anhui,232001, China
[4] Mine Station, Hefei Design & Research Institute of Coal Industry, Hefei,Anhui,230041, China