1. China Railway Eryuan Engineering Group Co., Ltd, Chengdu, Sichuan, China
2. College of Earth Sciences, Guilin University of Technology, Guilin, Guangxi, China
3. Hebei Institute of Geological Surveying and Mapping, Langfang, Hehei, China
4. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China