1. School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710129, China
2. College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710000, China
3. China Coal Research Institute, China Coal Technology and Engineering Group, Beijing 100013, China
4. Beijing Institute of Land Renovation and Ecological Restoration, China Coal Technology and Engineering Group, Beijing 100013, China