1. Ph.D. Student, Faculty of Engineering, China Univ. of Geosciences, Wuhan 430074, PR China.
2. Professor, School of Civil Engineering, Sun Yat-sen Univ., Guangzhou 510275, PR China.
3. Engineer, Xiamen Anyue Trenchless Engineering Technology Co., No. 666 Xiahe Rd., Siming District, Xiamen 361026, Fujian Province, PR China.
4. Associate Professor, Faculty of Engineering, China Univ. of Geosciences, Wuhan 430074, PR China (corresponding author).