1. College of Resources and Environmental Engineering, Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang, China
2. Northwest Research Institute Co., Ltd of C.R.E.C, Lanzhou, Gansu, China
3. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, China
4. Southwest University of Science and Technology of Civil Engineering and Architecture, Mianyang, China