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Effects of Soil Aging on Mechanical and Hydraulic Properties of a Silty Soil

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Abstract

The aging phenomenon, which produces changes in material state over time, is associated with significant modification of mechanical and physical soil properties. This change should be accounted for during geotechnical design. Although soils sometimes improve with aging, the opposite effect is occasionally observed. This paper describes a study performed to investigate the effect of aging on the mechanical behavior and the permeability of a silty soil. Undrained unconsolidated triaxial shear tests and triaxial permeability tests were performed on disturbed and compacted samples. Upon conclusion of these tests, the samples were sealed from air and moisture. The results show an important increase in both the undrained shear strength and the deformation modulus caused by silt rigidification during the aging process. These changes cause an over estimation of laboratory measured shear strength. For instance, the increase in the deformation modulus and undrained cohesion can approach 100 % for an approximate 328 day storage period. Sample permeability was found to decrease with aging. This reduction can be ascribed to several causes including micro-organisms growth, secondary sample consolidation and progressive filling caused by the migration of very fine particles. These phenomena might have negated the expected increase in permeability with aging time reported in the literature.

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Authors and Affiliations

  1. Civil Engineering Department, National Engineering School of Gabes, Gabès, Tunisia

    Mounir Ltifi

  2. College of Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, FL, 32310, USA

    Tarek Abichou

  3. National Geology Higher School of Nancy, Nancy, France

    Jean Paul Tisot

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  1. Mounir Ltifi
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  2. Tarek Abichou
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  3. Jean Paul Tisot
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Correspondence to Tarek Abichou.

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Ltifi, M., Abichou, T. & Tisot, J.P. Effects of Soil Aging on Mechanical and Hydraulic Properties of a Silty Soil. Geotech Geol Eng 32, 1101–1108 (2014). https://doi.org/10.1007/s10706-014-9784-1

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  • DOI: https://doi.org/10.1007/s10706-014-9784-1

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