Hydromechanical behaviour of a volcanic ash

Alessio Ferrari, Alessio Ferrari, Eichenberger, Laloui

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


This paper presents experimental analysis and numerical modelling aimed at improved understanding and prediction of the hydromechanical behaviour of volcanic ash at various states of saturation. Results from a comprehensive experimental programme are presented in order to characterise the response of the material in terms of matric suction and confining stress changes. The evolution of the yield stress at different suction levels has been quantified. The volumetric response with suction variations allowed the analysis of the collapse-upon-wetting behaviour. Water retention and permeability are also addressed. Tests results are used to calibrate a constitutive model based on the effective stress concept extended to partially saturated conditions. The ability of the model to reproduce and anticipate the ash behaviour is tested with an articulated stress path.
Original languageEnglish
Pages (from-to)1433-1446
Number of pages14
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)


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