Funding for this research was provided by:
National Natural Science Foundation of China (51704125, 51874188, 51674154)
Postdoctoral Research Foundation of China (2017T100491 & 2016M602144)
Natural Science Foundation of Shandong Province (ZR2017QEE013 & 2018GGX109001, 2017GGX30101)
Research Fund of The State Key Laboratory for Geo-mechanics and Deep Underground Engineering, CUMT (SKLGDUEK1717)
Research Fund of The State Key Laboratory of Coal Resources and Safe Mining, CUMT (SKLCRSM18KF012)
Article History
Received: 28 July 2018
Accepted: 3 October 2019
First Online: 12 November 2019