1. Mining Management Branch of Shandong Gold Mining Co., LTD, Jinan, China
2. School of Environmental and Municipal Engineering, Qingdao University of Technology, Shandong, China
3. School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong, China; ;
4. School of Civil Engineering, Qingdao University of Technology, Shandong, China