1. Master’s Graduate, Dept. of Civil Engineering, Northeast Forestry Univ., Harbin 150040, China.
2. Professor, Dept. of Civil Engineering, Northeast Forestry Univ., Harbin 150040, China (corresponding author).
3. Doctoral Graduate, Dept. of Civil Engineering, Northeast Forestry Univ., Harbin 150040, China; Doctoral Graduate, Transport Construction Engineering Faculty, Pyongyang Univ. of Transport, Pyongyang 950003, Democratic People’s Republic of Korea.