Funding for this research was provided by:
the open fund for State Key Laboratory of Water Resources Protection and Utilization in Coal Mining (SHJT-16-30.19)
the Special Fund for Basic Scientific Research of Central Colleges (310827173702)
Article History
Received: 27 August 2019
Accepted: 18 February 2020
First Online: 3 March 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.