1. School of Resources and Civil Engineering; Wuhan Institute of Technology; Wuhan 430073 China
2. State Key Laboratory of GeoHazard Prevention & Geoenvironmental Protection; Chengdu University of Technology; Chengdu 610059 China
3. Department of Civil and Environmental Engineering; National University of Singapore; Singapore 117576
4. School of Civil Engineering & Mechanics; Huazhong University of Science & Technology; Wuhan 430074 China