Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation Xi’an University of Science and Technology Xi’an 710054 China;
Geological Research Institute for Coal Green Mining Xi’an University of Science and Technology Xi’an 710054 China;
College of Geology and Environment Xi’an University of Science and Technology Xi’an 710054 China;
School of Earth Sciences and Resources Chang’an University Xi’an 710054 China;
School of Earth Sciences and Engineering Xi’an Shiyou University Xi’an 710065 China;
