Evaluation of k0 of granular soils using DMT indices

Sung Kun Choi, Moon Joo Lee, Young Min Choi, Woojin Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A series of CPTs and DMTs are performed in the calibration chamber in order to develop methods that estimate the coefficient of at-rest earth pressure (K0), which is an indirect measure evaluating the stress history of granular soil. Among DMT indices and the qc value, KD is observed to be the most sensitive to the stress history while qc and ED show the similar trend of change as the vertical stress and stress history. The relation of Baldi et al. (1986) appears to be applicable for only NC sands as it does not include the term representing the effect of horizontal effective stress. The relations suggested in this study, KD=K0 χ(ED/σ́m)δ and KD/K0a0(ED/pa)a1(σ́m/pa)a2, are observed to provide comparable accuracy in K0 values with those of Jamiolkowski and Robertson (1988) and Mayne (1995, 2001), regardless of the stress history. Suggested relations use only DMT indices while Jamiolkowski and Robertson (1988) require both CPT and DMT results, and Mayne (1995, 2001) needs both the CPT result and the OCR value. Although the adoption of OCR in Mayne (1995, 2001) offers a considerable improvement in the accuracy of the K0 value, it is not considered practical since the inclusion of both soil property (OCR) and index parameters in an empirical correlation provides excessive redundancy.

Original languageEnglish
Pages (from-to)117-130
Number of pages14
JournalMarine Georesources and Geotechnology
Volume29
Issue number2
DOIs
Publication statusPublished - 2011 Apr

Keywords

  • At-rest coefficient of earth pressure
  • Dilatometer test
  • Granular soil
  • Horizontal stress index
  • Stress history

ASJC Scopus subject areas

  • Oceanography
  • Geotechnical Engineering and Engineering Geology
  • Ocean Engineering

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