Experimental Investigation and Predictive Modeling of Resilient Modulus of Subgrade Soil Considering Viscoelastic Properties
This research investigates the viscoelastic properties of subgrade soil,which cause the subgrade to show significant differences in dynamic resilient modulus (MR) when subjected to loads of different duration.To accurately predict the MR of subgrade soil,this study employed an improved dynamic triaxial test method to investigate the relationship between MR and factors such as load duration,confining pressure,and cyclic deviator stress.Two typical subgrade soils with high liquid limit silt and low liquid limit clay were selected for this study,and specimens with different working conditions were prepared for MR testing. Subsequently,the influence of different factors on the MR was analyzed.Analysis of the test results shows that as load duration increases,the MR of both soil samples gradually decreases.Moreover,the MR under different load durations displays different sensitivities to cyclic deviator stress.Grey relational analysis was then applied to assess the impact of factors,such as load duration,cyclic deviator stress,and confining pressure on the MR.Subsequently,combined with the Kelvin model,a comprehensive viscoelastic MR prediction model was established considering the compaction degree,moisture content,stress state,and load duration.Finally,the test results of other subgrade soils were used to verify the established prediction model and compared with conventional models that did not consider viscoelasticity.The validation results show that the newly established MR prediction model,which considers the viscoelastic properties of subgrade soil,has high accuracy and applicability. The research results provide valuable references for subgrade design and engineering practices.
subgrade engineeringviscoelasticitydynamic triaxial testdynamic resilience modulusprediction model
万方数据
维普
