KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지

Deformation Analysis of Cylindrical Earth Retaining Structures during Excavation Considering Nonlinear Soil Behavior at Small Strain

저변형률 비선형 지반거동을 고려한 원통형 토류구조물의 굴착시 변형해석

Lee, Byoung-Chul;Kim, Dong-Soo
이병철;김동수

  • Published : 2005.11.30

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Abstract

The lateral deflection of a cylindrical diaphragm wall and the associated ground movement induced by deep excavation are analyzed by performing site instrumentations and numerical analyses in the coastal area of Korea. Wall lateral deflection, rebar stress, and pore water pressure were measured and analyzed in eight directions. Variations of soil properties with the decrease of confining pressure are compared by performing various in-situ tests before and after excavation. To calculate the wall lateral deflection accurately, the effects of small strain nonlinearity and confining pressure reduction developed during excavation are considered in the proposed numerical analysis. By comparing numerical results with measured ones, the importances of considering small strain nonlinearity and confining pressure reduction in the nonlinear FEM are emphasized. Also, parametric studies on the performance of cylindrical diaphragm walls are carried out for the future similar excavation in the coastal area.

해안지역에서 깊은 굴착으로 인한 원통형 지중연속벽체의 수평변위와 인접한 지반의 거동을 현장계측하였고 수치해석 결과와 비교 분석하였다. 지중연속벽의 8위치에서 벽체수평변위, 철근응력, 간극수압을 측정하고 분석하였다. 굴착전후 여러가지 현장시험들을 수행함으로써 구속압의 감소에 따른 지반물성치의 변화들을 비교하였다. 제안된 수치해석에서는 벽체수평변위를 정확하게 산정하게 위하여 미소변형률에서의 지반거동의 비선형성과 굴착으로 인한 구속압 감소 효과들을 고려하였다. 현장계측값들과 수치해석 결과들을 비교함으로써, 지반거동의 비선형성과 구속압 감소 효과의 중요성이 강조되었다. 또한, 향후 유사한 굴착사례를 위하여 영향인자 연구도 수행하였다.

Keywords

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