1. School of Civil Engineering, University of South China, Hengyang, People’s Republic of China
2. Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, Xuzhou, People’s Republic of China
3. School of Civil Engineering, Wuhan University, Wuhan, People’s Republic of China
4. School of Mines, China University of Mining and Technology, Xuzhou, People’s Republic of China