Traffic-Load-Induced Permanent Deformation of Road on Soft Subsoil.pdf

Traf?c-Load-Induced Permanent Deformation of Road on Soft Subsoil Jin-Chun Chai 1and N. Miura 2 Abstract: A method for predicting the traf?c-load-induced settlement of road on soft subsoil with a low embankment is proposed. The traf?c-load-induced dynamic stress in subsoil is calculated by the multilayer elastic theory ~not covered in this paper !. Then the plastic vertical strain in subsoil is calculated by an empirical equation, in which constants are related to the physical and mechanical properties of subsoil. The method was applied to analyze three different cases in Saga, Japan. Comparisons of the calculated values with ?eld data indicate that the proposed method can provide a reasonable prediction of traf?c-load-induced permanent settlement of the road on soft subsoil with a low embankment. The method is useful for designing the road with a low embankment on soft subsoil. For the cases studied with embankment thickness of to m, the depth signi?cantly in?uenced by traf?c load is abou t 6 m below the base of the embankments. DOI: / ~ ASCE ! 1090-0241 ~ 2002 !128:11 ~ 907 ! CE Database keywords: Embankment; Roads; Plastic deformation; Soil deformation; Soft soils; Deformation analysis. Introduction For a road with a low embankment ~less than -m high ! con- structed on soft subsoil, the permanent deformation of the subsoil due to traf?c load is one of th