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2014 Vol.30, Issue 9
Uplift Capacity of a Diaphragm Wall Installed in Ground with High Groundwater Table

높은 지하수위 지반 속에 설치된 지중연속벽의 인발저항력

Won-Pyo Hong1*
,
Neatha Chim2
홍 원표1*
,
침 니타2
1Prof., Dept. of Civil, Environmental & Plant Engrg., ChungAng Univ.
2Former Graduate Student, Dept. of Civil Engrg., ChungAng Univ.
1중앙대학교 건설환경플랜트공학과 교수
2중앙대학교 토목공학과 석사졸업
*교신저자. *Corresponding Author. 
30 September 2014. pp. 5-17
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Abstract

A series of model tests were conducted in order to observe the failure surface generated around a diaphragm wall embedded in ground with high groundwater table. Images of the soil deformation around the model wall were captured during the test. The configuration of the failure surface in soil around the model wall could be obtained from analyzing the image of the soil deformation. Based on the configuration of the failure surface observed in the model test, an analytical approach was proposed to predict the uplift capacity of a diaphragm wall installed in ground. The analytical approach considers not only the wall properties such as length, thickness and surface roughness of diaphragm walls but also the soil strength properties such as the internal friction angle and the cohesion of soil. The predicted uplift capacity of a diaphragm wall shows a good agreement with the experimental one measured in the model test.

Keywords
Diaphragm wall
Failure surface
Groundwater table
Model test
Uplift capacity
Analytical approach

지하수위가 높은 지역에 설치된 지중연속벽 주변지반 속에 발생되는 지중파괴면의 형상을 조사하기 위해 일련의 모형실험을 실시하였다. 모형실험에서 벽체가 인발될 때 발생하는 벽체 주변지반의 변형거동을 사진으로 촬영하여 관찰하였고 이 지반변형 결과를 분석하여 지중연속벽 주변지반에 발생되는 지중파괴면의 형상을 파악할 수 있었다. 이렇게 파악된 지중파괴면의 형상에 근거하여 지중연속벽의 인발저항력을 산정할 수 있는 이론해석을 실시하였다. 이 이론해석에는 벽체와 지반에 관한 주요 특성이 잘 반영되어 있다. 즉 벽체의 특성으로는 벽체의 길이, 두께 및 벽면조도가 포함되어 있으며 지반의 특성에 관하여는 흙의 내부마찰각 및 점착력과 같은 전단강도정수가 포함되어 있다. 제안된 해석모델에 의거하여 예측된 지중연속벽의 인발저항력은 모형실험에서 측정된 실험치와 잘 일치하였다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 30
  • No :9
  • Pages :5-17
  • Received Date : 2014-04-07
  • Revised Date : 2014-07-23
  • Accepted Date : 2014-08-11
  • DOI :https://doi.org/10.7843/kgs.2014.30.9.5
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