1. College of Land and Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, China
2. School of Resources and Safety Engineering, Central South University, Changsha, Hunan 410083, China
3. Hunan Polytechnic of Water Resources and Electric Power, Changsha, Hunan 410131, China
4. Nanning Rail Transit Co., Ltd., Nanning, Guangxi, 530028, China