Funding for this research was provided by:
Independent Research Project of State Key Laboratory of Coal Resources and Safe Mining, CUMT (SKLCRSM18X08)
National Natural Science Foundation of China (51574227)
PAPD (SZBF2011-6-B35)
Article History
Received: 17 February 2018
Accepted: 13 November 2018
First Online: 23 November 2018