Equivalent Compression Curve for Clay-Sand Mixtures Using Equivalent Void-Ratio Concept

Yiwen Zeng, Xiusong Shi, Wenbo Chen, Weiqiang Feng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


Clay-sand mixtures are deposited worldwide, such as naturally sedimentary soils and dredged clays in human activities. These mixtures usually have a fine fraction above the transitional fine content, and the compressibility is dominated by clay matrix and affected by sand fraction. In this paper, an explicit equivalent compression curve is proposed for clay-sand mixtures. This is done by directly incorporating the equivalent void ratio into the intrinsic compression model of the clay matrix. The roles of initial and evolving soil structure developed during the compression process are described by a structural variable, which can be directly computed from the experimental data. Experimental data compiled from various literature are used for evaluating the accuracy of the suggested model. They indicate that the proposed relationship of stress versus equivalent void ratio is simple yet effective to evaluate the compressibility of clay-sand mixtures with a wide spectrum of sand fraction. The model is also practically useful for estimating the compressibility of other gap-graded soils, such as clay-gravel mixtures. The proposed stress versus equivalent void-ratio equation is an elementary function and can be readily implemented into general elastoplastic models.

Original languageEnglish
Article number06022039
JournalInternational Journal of Geomechanics
Issue number2
Publication statusPublished - 1 Feb 2023


  • Clay-sand mixtures
  • Compressibility
  • Equivalent compression curve
  • Equivalent void ratio
  • Structure variable

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology


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