Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Cyclic Simple Shear Test Based Design Liquefaction Resistance Curve of Granular Soil

반복단순전단시험에 기반한 조립토의 설계 액상화 저항 곡선 개발

  • Received : 2016.05.17
  • Accepted : 2016.06.03
  • Published : 2016.06.30
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Abstract

We develop liquefaction resistance curves, which represent the correlation between cyclic resistance ratio (CRR) and number of cycles (N) to estimate the build-up of residual excess pore pressure from simple shear tests performed for this study and also from published literature. The liquefaction curve is calculated from two models. The comparisons show that one of the models is not reliable because it underestimates CRR. The scatter of the data is shown to be significantly reduced when CRR is normalized to the resistance ratio at N = 15 ($CRR_{N=15}$). Use of the normalization is particularly useful because CRR can be easily estimated from field tests. From normalization, we propose mean, upper, and lower curves. The corresponding design equation and its parameters are also proposed. We believe that the proposed curves can be used for effective stress site response analyses and evaluation of the seismic performance of port structures.

본 논문에서는 지진 시 작용하는 반복적 하중에 의하여 발생하는 잔류 과잉간극수압 예측에 필요한 반복저항응력비(CRR)와 재하횟수 N 간의 관계를 나타내는 액상화 저항 곡선을 반복단순전단시험과 문헌조사를 통하여 도출하였다. CRR과 N 자료는 두 가지 모델을 이용하여 최적 곡선을 계산하였으며 계측된 자료와 비교한 결과, 이중 한 가지 모델은 CRR이 다소 작게 산정되어 정확도가 떨어지는 것으로 나타났다. 다양한 액상화 저항 곡선을 살펴본 결과, 반복저항응력비(CRR)는 재하횟수 N = 15에서의 CRR($CRR_{N=15}$)로 정규화할 경우, 분산이 크게 감소하는 것을 확인하였다. 이와 같은 정규화가 특별히 유용한 이유는 $CRR_{N=15}$은 실내시험이 아니라 현장시험으로부터 쉽게 산정 가능하기 때문이다. 정규화를 통하여 평균과 상한 및 하한 곡선을 도출하였으며, 각각에 상응하는 설계식과 변수 또한 제시하였다. 제안된 곡선은 추후 부지 고유의 지반응답해석과 항만 구조물의 안정성 평가 등에 활용될 수 있을 것으로 판단된다.

Keywords

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