Evaluation of dynamic behavior of shallow foundation through soil-foundation-structure-interaction in liquefied soil using centrifuge modeling원심모형실험을 이용한 액상화 지반에서의 지반-기초-구조물-상호작용에 의한 얕은 기초의 동적거동 평가

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Liquefaction can occur in saturated and loose soils and cause catastrophic damage accompanied with ground settlement and rotation of superstructures. Structures on liquefied soils are exposed to the volumetric-induced settlement, deviatoric-induced settlement, and soil ejecta (sand boil). However, ground deformation mechanisms associated with soil-foundation-structure interaction (SFSI) remains poorly understood. Therefore, this dissertation aims to observe the dynamic and settlement behaviors of liquefiable soils during earthquake loading, to evaluate the effect of structural load and earthquake duration on dynamic behavior of a shallow foundation and associated ground settlement, and to examine the effect of sequential liquefaction triggers on dynamic behavior of a shallow foundation and associated ground settlement, through dynamic centrifuge modelling. The centrifuge experiment results show clear evidences of liquefaction and associated ground settlement in free-field ground without a foundation. By contrast, the ground under a foundation shows the ratio of pore water pressure (Ru) less than unity, but with a more significant deformation due to its overlying structural weight. It is found that the earthquake duration has a profound effect on the settlement of an overlying structure rather than the peak amplitude of earthquake. As the first earthquake induces a small rotation of a structure, the after-shock earthquake exacerbates and causes more severe rotations of the structure though it causes less settlement due to the reduced void ratio and the foundation embedment effect. Among the intensity measures, the cumulative absolute velocity (CAV) shows a good correlation with the settlement. The presented study provides clear physical modeling result that advances our understanding on the dynamic characteristics of the soil-foundation-structure interaction (SFSI) during earthquakes in the liquefied ground through centrifuge experiment.
Advisors
Kwon, Tae-Hyukresearcher권태혁researcher
Description
한국과학기술원 :건설및환경공학과,
Publisher
한국과학기술원
Issue Date
2021
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 건설및환경공학과, 2021.8,[x, 131 p. :]

Keywords

Centrifuge experiment▼aGround motion▼aLiquefaction▼aShallow foundation▼aDeformation; 원심모형실험▼a지진▼a액상화▼a얕은 기초▼a변형

URI
http://hdl.handle.net/10203/294856
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=963774&flag=dissertation
Appears in Collection
CE-Theses_Master(석사논문)
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