1. Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, 1 Daxue Rd., Xuzhou 221116, China
2. School of Mines, China University of Mining and Technology, 1 Daxue Rd., Xuzhou 221116, China
3. School of Mines, China University of Mining and Technology, 1 Daxue Rd., Xuzhou 221116, China (Corresponding author), e-mail: yaoqiangling@cumt.edu.cn, https://orcid.org/0000-0001-9900-4615