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A NEW EQUATION FOR THE SUCTION INDUCED SHRINKAGE OF CLAYEY SOILS
 

Summary: A NEW EQUATION FOR THE SUCTION INDUCED SHRINKAGE OF
CLAYEY SOILS
Mamert Mbonimpa*
, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, Québec, Canada.
Michel Aubertin, École Polytechnique de Montréal, Montréal, Québec, Canada.
Bruno Bussière, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, Québec, Canada.
Abdelkabir Maqsoud, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, Québec,
Canada.
*Corresponding Author: mamert.mbonimpa@uqat.ca
ABSTRACT
An increase of the suction applied to a deformable soil may induce shrinkage and desaturation. This makes the
determination of the water retention curve (WRC) of such soils more complex, as one needs to follow simultaneously
the volumetric shrinkage curve (VSC) and the water content. Descriptive and predictive models can be useful to
assess the behaviour of compressible soils. After reviewing typical results obtained on relatively soft and initially
saturated clayey soils, the authors introduce new equations to describe the VSC. A simplified tree linear segment
representation, inspired by the consolidation theory, is first used. It is then generalised using a curvilinear equation.
The proposed models describe the VSC in terms of the change of void ratio e with an increase in suction .
Experimental data are used to validate the descriptive capabilities of the VSC models. For predictive purposes,
empirical relationships are proposed to estimate the model parameters from the liquid and plastic limits, solid grain
density, and initial void ratio. The typical results shown here indicate a good agreement between measured and

  

Source: Aubertin, Michel - Département des génies civil, géologique et des mines, École Polytechnique de Montréal

 

Collections: Engineering; Environmental Management and Restoration Technologies