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연약지반의 모래다짐말뚝에 대한 하중전이 연구
Study on Lond Transfer Characteristics of Sand Compaction Piles in Soft Soil Deposits

김재권    (Chief of Civil Technology Team, Samsung Corporation   ); 김수일    (Yonsei Univ.   ); 정삼성    (Yonsei Univ.  );
  • 초록

    모래다짐말뚝은 압밀침하촉진과 지지력향상을 도모할 수 있는 연약지반 개량공법으로 그 사용성이 증가하고 있다. 본 연구에서는 실내시험과 3-D 유한요소해석을 수행하여 $30-40\%$ 의 저치환율 모래다짐말뚝의 하중전이특성을 고찰해본다. 또한, 이러한 연구결과는 실험치와의 검증을 통하여 모래다짐말뚝 하중전이특성평가를 위한 간편법을 제시하는데 사용되었다.


    Sand Compaction Pile (SCP) is a soft-ground improvement technique used for not only accelerating consolidation but also increasing bearing capacity of soils. In this study, laboratory tests and 3-D finite element analysis were peformed to investigate the characteristics of load transfer in SCP with an emphasis on free-strain behavior of piles with low replacement ratios in the range of 30 to $50\%$ . Through these focused tests and numerical analyses, we proposed a simplified method to analyze the load transfer characteristics of SCP in soft ground. Moreover, it was shown that estimated normal stresses in SCP using the proposed method were in a reasonable agreement with actual values.


  • 주제어

    Finite element analysis .   Free strain .   Load transfer characteristics .   Replacement ratio .   Sand compaction pile (SCP) .   Stress concentration ratio.  

  • 참고문헌 (20)

    1. Aboshi H, Ichimoto E, Enoki M, and Harada K. (1979), 'The composer, A Method to Improve Characteristics of Soft Clays by Inclusion of Large Diameter Sand Columns', Proceeding of International College on Soil Reinforcement, Paris, France, I, 211-216 
    2. Goughnour RR and Bayuk AA. (1979), 'Analysis of Stone Column - Soil Matrix Interaction under Vertical Load', Colleque Inter-national sur Ie Reinforcement des Sols, Paris, France, I, 271-277. 
    3. Greenwood DA. (1970), 'Mechanical Improvement of Soils below Ground Surface', Proceeding of Ground Engineering Conference, Institute of Civil Engineering, 9-20 
    4. Hughes JMO, Withers NJ, and Greenwood DA. (1975), 'A Field Trial of the Reinforcing Effect of a Stone Column in Soil. Geotechnique', 25(1), 31-44 
    5. Kim J. (2003), Load Transfer Characteristics of SCP in Soft Clays, Ph.D. Dissertation, Yonsei Univeristy 
    6. Pyeongwon Engineering Ltd. (1999), Soil Investigation Report for the Inchon Container Yard Construction 
    7. Soyez B. (1985), 'Methodes de dimension nement des colonnes balastees', Bulletin de Liaison des Laboratories des Ponts et Chaussees, 136, 36-51 
    8. Takemura J, Watabe Y, Suemasa N, Hirooka A, and Kimura T. (1991), 'Stability of Soft Clay Improved with Sand Compaction Piles', Proceeding of Asian Regional Conference, 1: 543-546 
    9. Wong HY. (1975), 'Vibroflotation - Its Effect on Weak Cohesive Soils', Civil Engineering, London, 824, 44-67 
    10. Ralunan Z, Takemura J, Kouda M, and Yasumoto K. (2000), 'Experimental Study on Deformation of Soft Clay Improved by Low Replacement Ratio SCP under Backfil1ed Caisson Loading', Soils and Foundations, 19-35. 
    11. Alarngir M, Miura N, Poorooshasb HB, and Madhav MR. (1996), 'Deformation Analysis of Soft Ground Reinforced by Columnar Inclusions', Computers and Geotechnics, 18(4): 267-290 
    12. Datye KR. (1982), 'Settlement and Bearing Capacity of Founda-tion System with Stone Columns', International Symposium on Soil and Rock Improvement Techniques Including Geotextiles, Reinforced Earth, and Modem Piling Methods, Asian Institute of Technology, Bangkok, AI 
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    14. Chosuk Construction Co. Ltd. (1999), Construction Report - Soil Compaction Pile, Pusan Newport Development 
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    16. Hughes JMO and Withers NJ. (1974), Reinforcing Soft Cohesive Soil with Stone Columns. Ground Engineering, 7: 42-29 
    17. Alamgir M, Miura N, and Madhav MR. (1994), Analysis of Granular Column Reinforced Ground - 1: Stress Transfer from Granular Column to Soil, Report of the Faculty of Science and Engineering, Saga University, Japan, 23, 81-94 
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    20. Broms B. (1972), 'Negative Skin Friction', Proceeding of $6^{th}$ Asian Regional Conference on SMFE, Singapore, 2, 41-75. 
  • 이 논문을 인용한 문헌 (1)

    1. Bae, Kyung-Tae ; Lee, Chong-Kyu 2007. "The Behavior of Rammed Aggregate Piers (RAP) in Soft Ground (I)" 韓國地盤工學會論文集 = Journal of the Korean geotechnical society, 23(4): 169~183     

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