1. School of Civil Engineering, Shaoxing University, Shaoxing, China
2. Rock Mechanics and Geo-Hazards Center, Shaoxing University, Shaoxing, China
3. Department of Earth Science and Engineering, Hohai University, Nanjing, China
4. Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Daqing Oilfield, Daqing Logging & Testing Serv Co, Daqing, China