Towards a Unified Soil Mechanics Theory: The Use of Effective Stresses in Unsaturated Soils

Open Access

|Oct 2013

With the application of the effective stress conceptthe strength and volumetric behavior of saturated materials was clearly understood. For the case of unsaturated materialsa universally accepted effective stresses equation is still under debate. Howeverthe use of the effective stress concept to develop constitutive models for unsaturated soils is becoming increasingly popular not only because the hydro-mechanical coupling observed in these materials is implicit in the formulation but also because simpler and more precise models can be established. Towards A Unified Soil Mechanics Theory demonstrates that the same strength and volume change equations used in saturated soil mechanics can be used for the case of unsaturated soils. In other wordsthe constitutive models developed for saturated soils can be used for unsaturated materials once the effective stress equation has been defined.

In this bookan analytical equation for the effective stress for unsaturated soils is established. This equation requires the knowledge of the superficial area of solids affected by the capillary phenomenon. In other wordswe need to know how water distributes in the pores of the soil. This distribution can be modeled using a solid-porous model built on a regular network. However the size of the network required to correctly simulate the structure of a small soil sample cannot be managed with a common PC. For that reasona probabilistic porous-solid model is developed. This model uses the pore size distribution in the form of a probabilistic function which in addition to the Laplace equation and the principle of continuity can be expressed as the probability of a pore of certain size to be filled or dry at suction during a wetting or drying pathrespectively. In this waythe soil-water retention curves can be simulated and the effective stress at any suction during wetting or drying processes can be determined. Based on this approachit is shown that unsaturated soils behave under the same principles for strength and volumetric behavior as saturated soils.
Towards A Unified Soil Mechanics Theorypaves the way for a universal theory of soil mechanics. The volume will be a valuable reference to civil engineersearth scientists and hydrologists interested in soil mechanics at both academic and professional levels.

PDF ISBN: 978-1-60805-739-9

Publisher: Bentham Science

Publication date: 2013

Language: English

Pages: 200

Related subjects:

Engineering,

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Towards a Unified Soil Mechanics Theory: The Use of Effective Stresses in Unsaturated Soils

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