Gang Wang
College of Safety and Environment Engineering, Shandong University of Science and Technology, Qingdao 266590, P. R. China; Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Shandong University of Science and Technology, Qingdao 266590, P. R. China
China

Xuechang Chen
College of Safety and Environment Engineering, Shandong University of Science and Technology, Qingdao 266590, P. R. China
China

Gang Wang
College of Civil Engineering, Fujian University of Technology, Fuzhou 350118, P. R. China
China

Houquan Zhang
State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China
China

Jing Wang
School of Qilu Transportation, Shandong University, Jinan 250061, P. R. China
China

Hao Xu
College of Safety and Environment Engineering, Shandong University of Science and Technology, Qingdao 266590, P. R. China
China