1. Emeritus Professor, Dept. of Civil Engineering, Dong-A Univ., 37, #550 St., Saha-gu, Busan 49315, Republic of Korea (corresponding author). ORCID: .
2. Senior Researcher, Soft Clay Engineering Laboratory, Industry-Academy Cooperation, Dong-A Univ., 37, #550 St., Saha-gu, Busan 49315, Republic of Korea. ORCID: .