1. Ph.D. Candidate, Dept. of Resources and Civil Engineering, Northeastern Univ., Shenyang, Liaoning Province 110000, PR China.
2. Professor, Dept. of Resources and Civil Engineering, Northeastern Univ., Shenyang, Liaoning Province 110000, PR China; Professor, Dept. of Civil Engineering, Inner Mongolia Univ. of Technology, Hohhot, Inner Mongolia Province 010051, PR China.
3. Professor, School of Civil Engineering, Inner Mongolia Univ. of Technology, Hohhot, Inner Mongolia Province 010051, PR China (corresponding author).