Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Numerical Analysis of Self-Supported Earth Retaining Wall with Stabilizing Piles

2열 자립식 흙막이 공법의 거동특성에 관한 수치해석적 연구

  • Sim, Jae-Uk (Dept. of Civil and Environmental Eng., Yonsei Univ.) ;
  • Jeong, Sang-Seom (Dept. of Civil and Environmental Eng., Yonsei Univ.) ;
  • Lee, Jun-Hwan (Dept. of Civil and Environmental Eng., Yonsei Univ.)
  • 심재욱 (연세대학교 토목환경공학과) ;
  • 정상섬 (연세대학교 토목환경공학과) ;
  • 이준환 (연세대학교 토목환경공학과)
  • Received : 2015.01.29
  • Accepted : 2015.04.10
  • Published : 2015.05.31
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Abstract

In this study, the behavior of self-supported earth retaining wall with stabilizing piles was investigated by using a numerical study and field tests in urban excavations. This earth retaining wall can provide stable support against lateral earth pressures through its use of stabilizing piles that provide passive resistance to lateral earth pressures arising due to ground excavations. Field tests at two sites were performed to verify the performance of instrumented retaining wall with stabilizing piles. Furthermore, detailed 3D numerical analyses were conducted to provide insight into the in situ wall behavior. The 3D numerical methodology in the present study represents the behavior of the self-supported earth retaining wall with stabilizing piles. A number of 3D numerical analyses were carried out on the self-supported earth retaining wall with stabilizing piles to assess the results stemming from wide variations of influencing parameters such as the soil condition, the pile spacing, the distance between the front pile and the rear pile, and the pile embedded depth. Based on the results of the parametric study, the maximum horizontal displacement and the maximum bending moment significantly decreased when the retaining wall with stabilizing piles is used. Moreover, the horizontal displacement reduction effect of influencing parameters such as the pile spacing and the distance between the front pile and the rear pile is more sensitive in sandy soil, with a higher friction angle compared to clayey soil. In engineering practice, reducing the pile spacing and increasing the distance between the front pile and the rear pile can effectively improve the stability of the self-supported earth retaining wall with stabilizing piles.

본 연구에서는 최근 국내에서 사용이 증가하고 있는 2열 자립식 흙막이 공법에 있어서 안정성에 영향을 미치는 주요 설계인자들을 분석하고 설계기준을 제안하기 위하여 현장적용 결과의 분석 및 3차원 유한차분 해석을 수행하였다. 지반특성에 따른 본 공법의 거동을 분석하기 위하여 사질토가 지배적인 현장과 점성토가 지배적인 2개의 현장에 적용을 수행하였으며, 굴착에 따른 흙막이 벽체의 수평변위 및 휨모멘트를 분석하였다. 3차원 유한차분 모델링 기법의 타당성을 검증하기 위하여 현장적용 결과와 비교 분석을 수행한 결과, 본 연구의 수치해석 모델링 기법은 본 공법의 굴착에 따른 거동을 합리적으로 모사하는 것으로 나타났다. 또한 흙막이 벽체를 구성하는 전열말뚝(엄지말뚝) 및 후열말뚝(억지말뚝)의 간격(S), 전열말뚝과 후열말뚝간의 거리(D), 굴착심도(H) 및 말뚝의 근입깊이(Z) 등, 본 공법의 주요 설계인자들의 영향 정도를 분석하기 위하여 다양한 경우의 3차원 유한차분 모델링 및 해석을 수행하였다. 그 결과, 굴착에 따라 발생하는 흙막이 벽체의 최대 수평변위는 전열말뚝 및 후열말뚝의 간격의 감소, 전열말뚝과 후열말뚝간의 거리의 증가 및 말뚝 근입심도의 증가에 따라 감소하였으며, 이러한 특징은 점성토 조건의 지반보다는 사질토 조건의 지반에서 보다 명확하게 나타나는 것을 확인할 수 있었다.

Keywords

References

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