1. No. 1 Exploration Institute of Geology and Mineral Resources of Shandong Province, Jinan, China
2. Shandong Jingwei Geotechnical Engineering Co., Ltd., Jinan, China
3. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, China
4. Zhengzhou Institute, China University of Geosciences (Beijing), Zhengzhou, Henan, China