1. Dept. of Construction and Disaster Prevention Engineering, Kyungpook National Univ., 2559, Gyeongsangdaero, Sangju, Gyeongbuk 742-711, Korea (corresponding author). E-mail: tranthev@gmail.com
2. Associate Professor, Dept. of Construction and Disaster Prevention Engineering, Kyungpook National Univ., 2559, Gyeongsangdaero, Sangju, Gyeongbuk 742-711, Korea.
3. Professor, Division of Geotechnical Engineering, Thuyloi Univ., 175 Tay Son, Dong Da, Hanoi 100000, Vietnam.
4. Associate Professor, Dept. of Agricultural and Rural Engineering, Chungnam National Univ., Daejeon 305-764, Korea.