Funding for this research was provided by:
Peak Project of Mining Engineering (2018GG-2-07)
National Natural Science Foundation of China (51774230, 51604212)
National Natural Science Foundation of China (51634007)
Article History
Received: 7 April 2020
Accepted: 18 June 2020
First Online: 29 June 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.