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2013 Vol.29, Issue 3
Evaluation of Compression Index for Natural Clay Using the Compression Characteristic of Reconstituted Clay

재성형점토의 압축특성을 이용한 자연점토의 압축지수 추정

Sung-Jin Hong1
,
Dong-Hee Kim2
,
Moon-Joo Lee3
,
Hong-Keun Jie4
,
Woo-Jin Lee5*
홍 성진1
,
김 동휘2
,
이 문주3
,
지 홍근4
,
이 우진5*
1Assistant Manager, Daelim Industrial co., Ltd.
2Manager, SK Engineering and Construction.
3Manager, Hanwha Engineering and Construction
4Managing Direct, Daewoo Engineering and Construction
5Professor, School of Civil, Environ. & Arch. Engrg., Korea Univ.
1대림산업 대리
2SK건설 과장
3한화건설 과장
4대우건설 상무
5고려대학교 건축･사회환경공학부 교수
*교신저자. *Corresponding Author. 
31 March 2013. pp. 5-13
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Abstract

The compression index, representing the compressibility of clay, is generally obtained from the consolidation test, or predicted by empirical correlations using soil properties. However, empirical methods have regional limitations, because the compression index is affected not only by soil properties but also by site characteristics, such as deposition conditions and stress history. In this study, a method evaluating the compression index from typical soil properties is suggested using the characteristics of reconstituted clay. By analyzing the consolidation test results of Busan clay, the suggested method is verified, and the analysis of prediction error is carried out. It is shown that the proposed method evaluates the compression index more accurately than empirical methods previously suggested. The prediction errors occur by assumption, and are inversely proportional to ecross/e0, obviously.

Keywords
Compression index
Consolidation test
Natural clay
Reconstituted clay

압축지수는 점토의 압축특성을 나타내는 대표적인 물성치로 압밀시험으로 직접 결정하거나, 점토의 기본 물성으로부터 경험적 방법으로 추정한다. 그러나 자연점토의 압축지수는 지반 물성치뿐 아니라 퇴적상태에 영향을 받으므로 경험적 추정방법은 지역적 한계를 지닌다. 본 연구에서는 재성형점토의 압축특성을 이용하여 지반 물성치로부터 자연점토의 압축지수를 추정하는 새로운 방법을 제안하였다. 부산점토의 압밀시험 결과를 통해 제안방법의 적합성을 검증하였으며, 오차원인을 분석하였다. 분석결과 제안된 방법은 경험적 추정방법보다 압축지수를 정확하게 추정하였다. 제안방법의 오차는 가정사항에 의해 발생하며, 추정오차는 ecross/e0와 명확한 반비례 관계를 나타냈다.

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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 :3
  • Pages :5-13
  • Received Date : 2011-08-01
  • Accepted Date : 2012-11-23
  • DOI :https://doi.org/10.7843/kgs.2013.29.3.5
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