Estimation of the small-strain stiffness of clean and silty sands using stress-strain curves and cpt cone resistance

Jun Hwan Lee, Doohyun Kyung, Bumjoo Kim, Monica Prezzi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The initial, linear elastic range of a soil stress-strain curve is often defined by the small-strain elastic modulus E0 or shear modulus G0. In the present study, simpler and effective methods are proposed for the estimation of the smallstrain stiffness of clean and silty sands; these are based on triaxial compression test results and the CPT cone resistance qc. In the method based on stress-strain curves obtained from triaxial compression tests, an extrapolation technique is adopted within the small-strain range of a transformed stress-strain curve to obtain estimates of the small-strain elastic modulus. Calculated small-strain elastic modulus values were compared with the values measured using bender element tests performed on clean sands and sands containing nonplastic fines. The results showed that the method proposed produces satisfactory estimates of the small-strain elastic modulus for practical purposes. In the CPT-based method, two G 0-qc correlations available in the literature were evaluated. For isotropic conditions, both correlations produced reasonably good estimates of G0 for clean sands but overestimated it for silty sands. A G0-gc correlation which is proposed takes into account the effect of silt content of the sand and stress anisotropy.

Original languageEnglish
Pages (from-to)545-556
Number of pages12
JournalSoils and Foundations
Volume49
Issue number4
DOIs
Publication statusPublished - 2009 Jan 1

Fingerprint

Stress-strain curves
stiffness
Cones
Sand
Stiffness
elastic modulus
Elastic moduli
sand
compression
Silt
shear modulus
Extrapolation
silt
Compaction
Anisotropy
anisotropy
Soils
method
test
soil

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology

Cite this

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abstract = "The initial, linear elastic range of a soil stress-strain curve is often defined by the small-strain elastic modulus E0 or shear modulus G0. In the present study, simpler and effective methods are proposed for the estimation of the smallstrain stiffness of clean and silty sands; these are based on triaxial compression test results and the CPT cone resistance qc. In the method based on stress-strain curves obtained from triaxial compression tests, an extrapolation technique is adopted within the small-strain range of a transformed stress-strain curve to obtain estimates of the small-strain elastic modulus. Calculated small-strain elastic modulus values were compared with the values measured using bender element tests performed on clean sands and sands containing nonplastic fines. The results showed that the method proposed produces satisfactory estimates of the small-strain elastic modulus for practical purposes. In the CPT-based method, two G 0-qc correlations available in the literature were evaluated. For isotropic conditions, both correlations produced reasonably good estimates of G0 for clean sands but overestimated it for silty sands. A G0-gc correlation which is proposed takes into account the effect of silt content of the sand and stress anisotropy.",
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Estimation of the small-strain stiffness of clean and silty sands using stress-strain curves and cpt cone resistance. / Lee, Jun Hwan; Kyung, Doohyun; Kim, Bumjoo; Prezzi, Monica.

In: Soils and Foundations, Vol. 49, No. 4, 01.01.2009, p. 545-556.

Research output: Contribution to journalArticle

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