1. Ph.D. Student, School of Resources and Civil Engineering, Northeastern Univ., No. 3-11, Wenhua Rd., Heping District, Shenyang 110819, China.
2. Professor, School of Resources and Civil Engineering, Northeastern Univ., No. 3-11, Wenhua Rd., Heping District, Shenyang 110819, China.
3. Ph.D. Student, School of Resources and Civil Engineering, Northeastern Univ., No. 3-11, Wenhua Rd., Heping District, Shenyang 110819, China (corresponding author).
4. Engineer, China Railway Design Corporation, No. 10, Minjiang Rd., Hebei District, Tianjin 300142, China.