1. Associate Professor, School of Resources and Civil Engineering, Northeastern Univ., No. 3-11 Wenhua Rd., Shenyang 110819, PR China.
2. Graduate Student, School of Resources and Civil Engineering, Northeastern Univ., No. 3-11 Wenhua Rd., Shenyang 110819, PR China.
3. Lecturer, School of Resources and Civil Engineering, Northeastern Univ., No. 3-11 Wenhua Rd., Shenyang 110819, PR China.
4. Professor, School of Resources and Civil Engineering, Northeastern Univ., No. 3-11 Wenhua Rd., Shenyang 110819, PR China.
5. Professor, School of Resources and Civil Engineering, Northeastern Univ., No. 3-11 Wenhua Rd., Shenyang 110819, PR China (corresponding author).