1. Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'an, China.
2. Geological Research Institute for Coal Green Mining, Xi'an University of Science and Technology, Xi'an, China.
3. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu Province, China.
4. College of Geology and Environment, Xi'an University of Science and Technology, Xi'an, China.