1. College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
2. Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an 710054, China
3. Jiangsu Geological and Mineral Resources Design and Research Institute, Xuzhou 221006, China
4. Aerial Photogrammetry and Remote Sensing Bureau, China National Administration of Coal Geology, Xi’an 710199, China
5. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China