1. Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, School of Civil Engineering, Shaoxing Univ., Shaoxing, Zhejiang 312099, China; School of Earth Science and Engineering, Hohai Univ., Nanjing, Jiangsu 211100, China.
2. Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, School of Civil Engineering, Shaoxing Univ., Shaoxing, Zhejiang 312099, China (corresponding author).
3. School of Earth Science and Engineering, Hohai Univ., Nanjing, Jiangsu 211100, China.