In the case of the Pohang earthquake, which had a magnitude of 5.4 in 2017, geotechnical damages such as liquefaction and ground settlement occurred. The need for countermeasures has emerged, and experimental research in the Pohang area has continued. This study collected undisturbed samples from damaged fine-grained soil areas where ground settlement occurred in Pohang. Cyclic tri-axial tests for identifying the dynamic characteristics of soils were performed on the undisturbed samples, and the results were analyzed to determine the cause of ground settlement. As a result of the study, it was determined that in the case of fine-grained soils, ground settlement occurred because the seismic load as an external force was relatively more significant than the shear resistance of the very soft fine-grained soils, rather than due to an increase in excess pore water pressure.

1. 연구배경 및 연구목적
2. 시료채취 및 실험방법
    2.1 시료 채취
    2.2 실내 물성시험 결과
3. 반복삼축시험의 수행 및 시험결과
4. 시험결과
5. 액상화 발생지층에 대한 내진설계시 액상화 평가검토
    5.1 지반응답해석을 이용한 액상화 반복전단응력비 산정
    5.2 액상화 저항강도비 산정 및 액상화 상세평가
6. 소결 및 제언

• 최재순(서경대학교 토목건축공학과 교수) | Choi, Jae Soon (Professor, Seokyeong Univ. Civil&Architectural Dept.,) Corresponding author
• 백우현(서울과학기술대학교 토목공학과 연구원) | Baek, Woo Hyun (Doctoral Student, Seoul National Univ. of Science&Technology Civil Eng. Dept.,)
• 진윤홍(㈜수성엔지니어링 사원) | Jin, Yoon Hong (Employee, Soosung Eng. Co.)