1. Associate Professor, School of Civil Engineering, Northeast Forestry Univ., Harbin, Heilongjiang 150040, China.
2. Master, School of Civil Engineering, Northeast Forestry Univ., Harbin, Heilongjiang 150040, China.
3. Professor, School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China (corresponding author).