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A Study on Applicability of the Calculation Method for Settlement of Stone Column

쇄석말뚝의 침하량 산정방법 적용성에 관한 연구

  • Received : 2015.09.30
  • Accepted : 2016.02.19
  • Published : 2016.03.01

Abstract

Stone column is the method that replace soft ground such as weak clay and loose sand with gravel or crushed stone which has relatively high stiffness and low compressive. Stone column increases bearing capacity of the soft ground, reduces settlement, produces ground improvement effect by consolidation drain, and is effective to prevent soil liquefaction in sandy ground during an earthquake. Stone column has been used in many civil works, and has recorded quite a lot of construction achievement internationally, but there is no standardized settlement calculation method yet. Therefore, in this study, the applicability of the existing theoretical equations were evaluated through comparison and analysis to predict a reasonable settlement of the Stone column. Consequently, Hook's law formula was verified to be the most close to numerical analysis.

쇄석말뚝공법은 비교적 강성이 크고 압축성이 작은 쇄석을 연약한 점성토 지반 및 느슨한 사질토 지반에 치환 후 다져 시공함으로써 연약한 지반의 지지력 증가와 침하량 감소, 압밀배수에 의한 지반개량 효과에 더불어 사질토 지반에서는 지진 발생시 액상화 방지에 효과적인 공법이다. 쇄석말뚝공법은 여러 토목분야에서 활용되고 국제적으로 상당히 많은 시공실적을 보이고 있으나, 아직까지 정형화된 침하량 산정방법은 없다. 따라서 본 연구에서는 쇄석말뚝공법의 합리적인 침하량을 예측하기 위하여 기존에 제안되어 사용되고 있는 침하량 이론식들을 비교 분석하여 적용성을 평가하였다. 그 결과 Hook's law 식이 수치해석과 가장 근접하는 것으로 확인되었다.

Keywords

References

  1. An, J. H. (2012), Study on improving methods for estimates of settlement based on tank in Middle East, Master's thesis, yonsei university, pp. 42-44 (in Korean).
  2. Iowa state university (2003), Highway applications for rammed aggregate piels in Iowa soils, Iowa state university, pp. 9.
  3. Kim, S. W., Lee, C. H., Kim, K. H. and Choi, H. S. (2011), A comparison of analysis methods on mechanical behavior of stone column reinforced in the soft sabkha deposit, Korean Geotechnical Society, pp. 53-63 (in Korean). https://doi.org/10.7843/kgs.2011.27.1.053
  4. Korean Geotechnical Society (2009), Commentary of foundation structure design criteria, Korean Geotechnical Society, pp. 247-266 (in Korean).
  5. Priebe (1976), Estimating settlements in a gravel column consolidated soil, Die bautechnik 53, German, pp. 160-162.
  6. Raman, S. (2006), Comparison of predicted settlement behavior to the field measurement of stone column improved ground, M.S. Theis, Universiti Teknologi Malaysia, pp. 33-63.
  7. Vesic, A. S. (1961), Bending of beams resting on isotropic elastic soild, ASCE Journal of the Engineering Mechanics, Vol. 87, No. EM2, pp. 35-53.