Small and large strain behaviour of an unsaturated compacted silt

Abstract

The results of small and large strain triaxial tests and matrix suction measurements, performed on a compacted low plasticity silt under different conditions of water content, density and confining stress, are presented. Simple models are proposed to interpret the results, one based on an empirical approach and the other one derived from micromechanics. Based on the calculation of the capillary forces between individual particles and using a single parameter, the micromechanical model yields a satisfactory interpretation of the changes in the elastic modulus and maximum strength of the soil with water content. RÉSUMÉ. L'article présente les résultats d'essais triaxiaux en petites et moyennes déformations et de mesures de la succion matricielle réalisés sur un silt peu plastique compacté, dans différentes conditions de teneur en eau, densité et contrainte de confinement.Des modèles simples sont proposés pour interpréter les résultats, l'un empirique et l'autre dérivé de la micromécanique. En partant du calcul des forces capillaires entre deux particules individuelles, le modèle micromécanique conduit à une interprétation satisfaisante des variations du module élastique et de la résistance maximale du sol avec la teneur en eau.

High performance prediction of soil compaction parameters using multi expression programming

“…To develop a prediction model of the soil compaction parameters for a wide range of soil classifications with high precision, 226 soil compaction tests were collected from the literature (Al-Khafaji 1993; Daniel and Wu 1993;Othman and Benson 1993;Shelley and Daniel 1993;Delage et al 1996;Miller et al 2002;Fleureau et al 2003;Inci et al 2003;Lim and Miller 2004;Clariá and Rinaldi 2007;Vassallo et al 2007;Ito and Komine 2008;Shafiee 2008;Taïbi et al 2008;Günaydın 2009;Horpibulsuk et al 2009;Li 2009;Sawangsuriya et al 2009;Agus et al 2010;Akcanca and Aytekin 2012;Millogo et al 2012;Heitor et al 2013;Burton et al 2014;Fox et al 2014;Duong et al 2014 (ASTM 2017). For the soil classification according to ASTM (2017), the investigated soils include lean clay (CL), silty clay (CL-ML), fat clay (CH), elastic silt (MH), silt (ML), clayey sand (SC), poorly graded sand with clay (SP-SC), well-graded sand with clay (SW-SC), silty sand (SM), clayey gravel (GC), poorly graded gravel with clay (GP-GC), well-graded gravel with clay (GW-GC) and silty gravel (GM).…”

Valorisation of dune sand-tuff for Saharan pavement design

“…15c and 15d), UCS and E 50 increase quasi-linearly with suction. In the literature [89][90][91]38], E is often estimated with the following formula:…”