1. Professor, School of Civil Engineering and Geomatics, Southwest Petroleum Univ., No. 8 Xindu Rd., Xindu District, Chengdu 610500, Sichuan, PR China.
2. Graduate Student, School of Civil Engineering and Geomatics, Southwest Petroleum Univ., No. 8 Xindu Rd., Xindu District, Chengdu 610500, Sichuan, PR China (corresponding author).
3. Lecturer, School of Management Engineering, Shandong Jianzhu Univ., No. 1000 Fengming Rd., Lingang Development Zone, Jinan 250101, Shandong, PR China.
4. Lecturer, School of Civil Engineering and Geomatics, Southwest Petroleum Univ., No. 8 Xindu Rd., Xindu District, Chengdu 610500, Sichuan, PR China.