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A compression model for sand–silt mixtures based on the concept of active and inactive voids

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Abstract

A compression model for sand–silt mixtures is needed in geotechnical engineering, for example in the analysis and prediction of deformation of levees and embankments due to internal erosion. In this paper, we introduce a novel concept of dividing the voids of a granular material into two hypothetical fractions: active and inactive voids. The active voids are kinematically available to the compression process. The inactive voids are kinematically unavailable to the compression process. The volume of active voids is dependent on the initial density and effective stress level. The volume of inactive voids is dependent on the amount of fines in the mixture. The current paper considers 1-D and isotropic compression behavior of sand–silt mixtures at stress levels lower than 2 MPa, so no substantial particle breakage is expected to occur. To successfully predict the void ratio for a sand–silt mixture during compression loading, we need (1) a mathematical expression for the evolution of the active void ratio during compression and (2) a relationship between the inactive void ratio and fines content of the mixture. For sand–silt mixtures with any amount of fines, the proposed model requires five material parameters, which are determined from two compression tests, and four minimum void ratio tests on sand–silt mixtures with different fines content. The performance of the proposed model is verified for six different types of sand–silt mixture with various fines contents, by comparing the predicted void ratios with the measured data from the experiments. The comparisons show a good agreement between the predictions and the measured data and prove the suitability of the proposed model for the prediction of compressibility of sand–silt mixtures with any amount of fines.

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Acknowledgements

This research was supported by National Science Foundation through Grant Number CMMI-1537491.

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  1. University of Massachusetts Amherst, Amherst, MA, USA

    Ching S. Chang, Mehrashk Meidani & Yibing Deng

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  1. Ching S. Chang
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Correspondence to Ching S. Chang.

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Chang, C.S., Meidani, M. & Deng, Y. A compression model for sand–silt mixtures based on the concept of active and inactive voids. Acta Geotech. 12, 1301–1317 (2017). https://doi.org/10.1007/s11440-017-0598-1

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  • DOI: https://doi.org/10.1007/s11440-017-0598-1

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