1. Shandong University, Geotechnical and Structural Engineering Research Center, Jinan 250061, China and Shandong University, School of Qilu Transportation, Jinan 250061, China. (corresponding author)
2. Shandong University, School of Qilu Transportation, Jinan 250061, China.
3. Shandong University, Geotechnical and Structural Engineering Research Center, Jinan 250061, China and Shandong University, School of Civil Engineering, Jinan 250061, China.
4. University of Connecticut, Department of Civil and Environmental Engineering, Storrs, Connecticut 06269, USA.