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Research Article

The Numerical Analysis on the Behaviour of Combined Sheet Pile in the Reclaimed Ground Mixed by Sandy Soil and Clayey Soil

사질토와 점성토가 혼재하는 해안 매립지반에서 조합형 Sheet Pile의 거동에 관한 해석적 연구

Byung-Il Kim1
Young-Sun Kim2
Sang-Jae Han3
Eon-Sang Park4*
김 병일1
김 영선2
한 상재3
박 언상4*
1Member, Director, Expert Group for Earth & Environment, 53 Seonggogae-ro, Uiwang-si, Gyeonggi-do 16006, Republic of Korea
2Member, Section Chief, Expert Group for Earth & Environment, 53 Seonggogae-ro, Uiwang-si, Gyeonggi-do 16006, Republic of Korea
3Member, President, Expert Group for Earth & Environment, 53 Seonggogae-ro, Uiwang-si, Gyeonggi-do 16006, Republic of Korea
4Member, Assistant Professor, Construction System Engineering, Soongsil Cyber University, 23 Samil-daero 30-gil, Jongno-gu, Seoul 03132, Republic of Korea
* Corresponding Author
30 September 2020. pp. 9-21
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Abstract

본 연구에서는 사질토와 점성토가 혼재하는 해안 매립지반에서 조합형 Sheet Pile 공법의 설계법을 고찰하였고 지반 굴착시의 거동을 해석하였다. 조합형 Sheet Pile 공법의 형태(Built up, Interlocking, Welding) 및 해석방법(엄지말뚝법, 연속벽법)에 따라 흙막이 가시설의 예측 거동이 상이함을 탄소성 해석으로부터 확인하였다. Sheet Pile(측면말뚝) 부재력의 경우 연속벽체 해석법의 결과가 가장 보수적인 결과를 예측하였다. 조합형 Sheet Pile 공법의 최대 부재력을 토대로 각 부재별 응력비(발생/허용)를 분석하면 측면말뚝의 경우 휨, 버팀보의 경우 조합응력에서 최대값을 나타내었다. 유한요소해석결과 측면말뚝의 부재력은 단기 유효응력 해석 조건에서 가장 크게 나타난 반면, 버팀보의 압축력은 압밀 해석에서 크게 나타났다. 탄소성 해석과 유한요소해석 결과를 비교하면, 측면말뚝의 전단력과 버팀보의 축력은 탄소성 해석에서 크게 평가되었고, 측면말뚝의 휨은 유한요소해석의 단기 유효응력 조건에서 가장 큰 것으로 나타났다. 또한, 측면말뚝의 변위는 탄소성 해석보다는 유한요소해석에서 더 크게 예측되었다.

In this study, the design method of the combined sheet pile was considered in the coastal landfill where sandy and clayey soils are mixed, and the behavior in excavation was analyzed. It was confirmed from the elasto-plastic analysis that the predicted behavior of the temporary facilities of earth retaining differs according to the type of the combined sheet pile method (Built up, Interlocking, Welding) and the analysis method (soldier pile method, continuous wall method). In the case of sheet pile member force, the results of the continuous wall analysis method predicted the most conservative results. When the stress ratio (calculation/allowance) of each member was analyzed based on the maximum member force of the combined sheet pile method, the maximum value was obtained for bending moment in the side pile and combined stress in the case of the strut. As a result of finite element analysis, the member force of the side pile was the largest in the short-term effective stress analysis condition, while the compressive force of the strut was large in the consolidation analysis. When comparing the results of the elasto-plastic analysis and the finite element analysis, the shear force of the side pile and the axial force of the strut were greatly evaluated in the elasto-plastic analysis, and the bending moment of the side pile was the largest in the short-term effective stress condition of the finite element analysis. In addition, the displacement of the side pile was predicted to be greater in the finite element analysis than in the elasto-plastic analysis.

Keywords
Combined sheet pile
Sheet pile design
Ground improvement
Landfill
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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 19
  • No :3
  • Pages :9-21
  • Received Date :2020. 07. 13
  • Revised Date :2020. 08. 19
  • Accepted Date : 2020. 08. 28
  • DOI :https://doi.org/10.12814/jkgss.2020.19.3.009
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