1. Department of Civil Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan (Corresponding author), e-mail: hsmt@iis.u-tokyo.ac.jp, https://orcid.org/0000-0002-9458-8583
2. Department of Civil Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
3. Geotechnical Engineering Department, Port and Airport Research Institute, 3-1-1 Nagase, Yokosuka, Kanagawa 239-0826, Japan
4. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan