1. College of Civil Engineering, Fuzhou University, Fuzhou, P. R. China
2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, P. R. China
3. Department of Civil Engineering, Shanghai University, Shanghai, P. R. China
4. Ecole des Ponts ParisTech, Laboratoire Navier/CERMES, France
5. College of Civil Engineering, Zhejiang University of Technology, Hangzhou, P. R. China