1. Key Laboratory of Deep Coal Resource Mining, China University of Mining and Technology, Ministry of Education, Xuzhou 221116, China
2. School of Mines, China University of Mining and Technology, Xuzhou 221116, China
3. Key Laboratory of Computational Geodynamics, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
4. No. 6 Coal Mine of Pingdingshan Tian’an Coal Industry Co., Ltd., Pingdingshan 467091, China