1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu, China
2. Civil Engineering School, Henan University of Technology, Zhengzhou, Henan, China
3. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Highway and Railway Research Institute, Hohai University, Nanjing, Jiangsu, China