铁道标准设计2018，Vol.62Issue(1)：68-73,77,7.DOI:10.13238/j.issn.1004-2954.201703160004
交通荷载作用下土体黏弹塑性疲劳本构模型
Visco-elastic-plastic Fatigue Constitutive Model for Soil under Traffic Loading
摘要
Abstract
The post settlement of subgrade is caused by subgrade creep under self-weight and vehicle dynamic loading,and it is of great significance to study soil creep properties under traffic loading for subgrade settlement prediction.Based on the theoretical achievements of rheological mechanics,the combined loading simplified by vehicle dynamic loading and self-weight loading of subgrade soil is processed equivalently.A fractional-order dashpot based on fractional calculus is constructed,constant dashpot in the visco-plastic body of nishihara's model is replaced with fractional-order dashpot,a visco-elastic-plastic fatigue constitutive model for soil under traffic loading is obtained by doing so.When the upper stress of combined loading is larger than critical dynamic stress of soil,the model is fractional-order nishihara's model,which can reflect the destructive deformation law of soil;otherwise,it is a generalized Kelvin model,which can reflect stable deformation law of soil.Results show that this model can better reflect the creep behavior of soil under traffic loading and its fitted correlation coefficient of test data is above 0.91.关键词
交通荷载/工后沉降/蠕变/分数阶黏壶/黏弹塑性疲劳本构模型Key words
Traffic loading/post-construction settlement/Creep/Fractional-order dashpot/Visco-elastic-plastic fatigue constitutive model分类
交通工程引用本文复制引用
陈泽南,浦少云,饶军应,方琴,刘汉卿,郝至诚..交通荷载作用下土体黏弹塑性疲劳本构模型[J].铁道标准设计,2018,62(1):68-73,77,7.基金项目
国家自然科学基金(51608141) （51608141）
贵州大学引进人才科研项目(贵大人基合字(2015)16) （贵大人基合字(2015）
