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Transport in Porous Media

, 64:261 | Cite as

Suction Induced Effects on the Fabric of a Structured Soil

  • Azad Koliji
  • Lyesse LalouiEmail author
  • Olivier Cusinier
  • Laurent Vulliet
Article

Abstract

This paper presents the mathematical modelling of the modification of the pore space geometry of a structured soil subjected to suction increase. Structured soil concepts are first introduced considering different fabric units, such as aggregates and fissures. The numerical modelling of the structural evolution is based on experimental test results in which the evolution of the structure of the samples subjected to different suctions is determined using the mercury intrusion porosimetry technique. From this information, the macro and micropore volume evolutions are determined. The results show that drying produces a reduction in the soil total porosity which mainly corresponds to a reduction of the macropore volume. Associated with this phenomenon, an increase in micropore volume is also observed. The proposed model divides pore size distribution into three pore classes (micropores, macropores and non-affected areas). Using the concept of a suction-influenced domain, the proposed model is able to reproduce the main observed fabric evolution between the saturated and dry states.

Keywords

structured soil fabric suction pore size distribution 

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Copyright information

© Springer 2006

Authors and Affiliations

  • Azad Koliji
    • 1
  • Lyesse Laloui
    • 1
    Email author
  • Olivier Cusinier
    • 1
    • 2
  • Laurent Vulliet
    • 1
  1. 1.Laboratoire de mécanique des sols (LMS)Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
  2. 2.Laboratoire Environnement, Géomécanique & OuvragesEcole Nationale Supérieure de Géologie-INPLNancyFrance

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