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2013 Vol.29, Issue 11 Preview Page
Application of Soil-Cement Piles to the Ground Improvement of Harbor Structures

소일-시멘트 파일을 이용한 항만구조물의 말뚝식 지반개량 적용성

Seong-Hun Lee1
,
Oh-Yeob Kwon2*
,
Jong-Ho Shin3
이 성훈1
,
권 오엽2*
,
신 종호3
1DY Engrg. Co., LTD.
2Prof., Dept. of Civil Engrg., Konkuk Univ.
3Prof., Dept. of Civil Engrg., Konkuk Univ.
1(주)대영엔지니어링 지반공학부
2건국대학교 토목공학과 교수
3건국대학교 토목공학과 교수
*교신저자. *Corresponding Author. 
30 November 2013. pp. 29-47
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Abstract

This study undertook research on the sections of 90 harbor structures which applied a pile-type soil improvement using the soil-cement pile and then, determined the minimum replacement rate for each section, showing sufficient stability in all relevant studies including numerical analysis. The reliability of the numerical analysis was verified by a centrifuge model test. As a result of the study, it was revealed that when the foundation soil is too soft (= under 15 kPa), it is unsuitable to apply a pile-type ground improvement to a soil improvement regardless of types of super structures. And a pile-type soil improvement was found to be suitable for a harbor structure with the relative stiffness ratio () of less than 50～75 at a maximum and the 2～3 MPa strength of the soil-cement pile. Furthermore the governing factor for the minimum replacement rate for the pile-type soil improvement was turned out to be the allowable horizontal displacement. Therefore, the primary review to see the applicability of the pile-type soil improvement requires the evaluation of horizontal displacements.

Keywords
Pile type ground improvement
The minimum replacement rate
Centrifuge model test
Stiffness ratio

본 연구에서는 항만구조물 기초지반에 소일-시멘트 파일을 이용한 말뚝식 지반개량을 적용한 90개 단면에 대해 안정검토를 수행하였고, 수치해석을 포함한 모든 항목에서 안정한 단면별 최소치환율을 결정하였으며, 원심모형실험을 통해 수치해석 결과의 신뢰성을 검증하였다. 연구결과, 기초지반이 매우 연약(=15kPa이하)한 경우에는 말뚝식 지반개량이 부적합하고, 항만구조물의 말뚝식 지반개량에는 기초지반과 개량체의 강성비()가 최대 50～75이하이고 개량체 강도가 2～3MPa인 소일-시멘트 파일공법이 가장 적합하며, 최소치환율 지배인자가 허용수평변위이므로 말뚝식 지반개량을 설계할 때는 반드시 수평변위를 검토해야 하는 것으로 나타났다.

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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 : 29
  • No :11
  • Pages :29-47
  • Received Date : 2013-06-11
  • Revised Date : 2013-09-04
  • Accepted Date : 2013-11-12
  • DOI :https://doi.org/10.7843/kgs.2013.29.11.29
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