Dependence Analysis and Prediction Model of Dynamic Resilient Modulus of Remodeled-loess

Abstract

To investigate the stress dependency of the dynamic resilient modulus (MR) of remodeled-loess, the dynamic triaxial tests were conducted under 16 stress paths, 3 degree of compactions and 4 water contents. The research results show that the effect of deviatoric stress and confining pressure are more significant than the bulk stress when the water content is higher, while the effect of deviatoric stress and bulk stress are more significant than confining pressure when the water content is lower. For the loess with low compaction degree, MR is significantly affected by the water content under low deviatoric stress conditions, while for loess with high compaction degree, MR is significantly affected by the water content under high deviatoric stress conditions. MR is significantly affected by deviator stress and bulk stress when ω<ωopt, while, it is significantly affected by deviator stress and confining pressure when ω≥ωopt. In view of this, a two-phase prediction model of MR is proposed based on the Ni mode which adopts different stress control parameters at different humidity stages, so as to express the performance parameters of loess subgrade accurately.

Keywords: remodeled-loess,  dynamic resilient modulus,  repeated loading triaxial test, dependence analysis,  phased prediction model