6533b7d1fe1ef96bd125d7b1
RESEARCH PRODUCT
Hydromechanical behaviour of a volcanic ash
Lyesse LalouiJohn EichenbergerAlessio Ferrarisubject
Laboratory testPartial saturationEffective stressEarth and Planetary Sciences (miscellaneous)Constitutive relationGeotechnical engineeringSuctionGeotechnical Engineering and Engineering GeologySaturation (chemistry)Partial saturationGeologyCollapsed settlementVolcanic ashdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-12-01 | Géotechnique |