Resilient modulus modelling of unsaturated subgrade soils: laboratory investigation of silty sand subgrade
2015 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, Vol. 16, no 3, 553-568 p.Article in journal (Refereed) Published
In flexible pavement structures, stiffness of unbound granular layers and subgrade soil significantly contribute to the overall performance of the pavement system. The stiffness of pavement unbound materials is widely characterised by the resilient modulus, M-r, which is obtained from repeated load triaxial (RLT) tests. Although pavement unbound materials are usually in partially saturated conditions and experience seasonal moisture content and therefore suction variations in the field, their stiffness is conventionally characterised using the total stress approach in which the effect of soil suction is not taken into account. Thus, an enhanced approach in predicting the stiffness of subgrade soils has to account for the partially saturated conditions and incorporate soil suction (i.e. matric suction) in the M-r constitutive models. In this study, several M-r prediction models that take into account the effect of pore suction were investigated. The M-r data set from an experimental investigation of two silty sand subgrade soils that was conducted using a suction-controlled RLT testing apparatus was used to optimise the parameter of these models. The capability of the M-r predictive models in capturing the resilient modulus behaviour of the silty sand subgrade soils and its variation due to seasonal changes in the moisture content (soil suction) were evaluated. It was observed that the M-r models that combine the three fundamental stress state variables (confining stress, deviator stress and matric suction) performed better in capturing the resilient modulus behaviour of the subgrade materials.
Place, publisher, year, edition, pages
2015. Vol. 16, no 3, 553-568 p.
moisture content, seasonal variation, unsaturated subgrade, resilient modulus, matric suction, repeated load triaxial test
IdentifiersURN: urn:nbn:se:kth:diva-162082DOI: 10.1080/14680629.2015.1021107ISI: 000355728600004ScopusID: 2-s2.0-84930753258OAI: oai:DiVA.org:kth-162082DiVA: diva2:796844
QC 201506262015-03-202015-03-202015-06-26Bibliographically approved