Qinghe Niu
Key Laboratory of Roads and Railway Engineering Safety Control (Shijiazhuang Tiedao University), Ministry of Education, Shijiazhuang 050043, P. R. China; Hebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mines, Shijiazhuang 050043, P. R. China
China

Xinyi Wang
Key Laboratory of Roads and Railway Engineering Safety Control (Shijiazhuang Tiedao University), Ministry of Education, Shijiazhuang 050043, P. R. China; Hebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mines, Shijiazhuang 050043, P. R. China
China

Jiangfang Chang
Department of Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang 050043, P. R. China
China

Wei Wang
Key Laboratory of Roads and Railway Engineering Safety Control (Shijiazhuang Tiedao University), Ministry of Education, Shijiazhuang 050043, P. R. China; Hebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mines, Shijiazhuang 050043, P. R. China
China

Xudong Liu
Bohai Bay Energy Research Institute, Northeast Petroleum University, Qinhuangdao 066000, P. R. China
China

Qizhi Wang
School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, P. R. China
China