考虑流变特性的黄土高路堤沉降过程计算方法  

Computational Method of Settlement Process of High Loess-filled Embankment Considering Rheological Characteristic

作　　者：张卫兵[1,2] 谢永利[3] 

机构地区：[1]宁夏大学宁夏节水灌溉与水资源调控工程技术研究中心,宁夏银川750021 [2]宁夏大学旱区现代农业水资源高效利用教育部工程研究中心,宁夏银川750021 [3]长安大学公路学院,陕西西安710064

出　　处：《公路交通科技》2011年第7期25-29,共5页Journal of Highway and Transportation Research and Development

基　　金：宁夏自然科学基金项目(NZ1035)

摘　　要：基于一维蠕变试验成果,并借助Kelvin流变模型建立了能同时考虑时间-应力-应变三者互动的Kelvin-双曲线经验模型。通过分析,表明该模型能反映压实黄土随时间增加,应变逐渐增大,应变速率逐渐减小,呈衰减型发展的蠕变特性。同时考虑到实际工程中填土荷载分级施加、前后两级荷载施加的时间间隔及填土层的厚度等问题,在做了必要的假定后,结合分层总和法的思想得出了相应的黄土高路堤沉降过程计算模型,并将该经验模型应用于实际工程,从而验证了模型的可靠性,同时对该模型的适用性进行了探讨。Based on 1D creep test achievement and with aid of Kelvin rheological model,the Kelvin hyperbolic empirical model was established.The model can simultaneously consider the interaction relationship among time,stress and strain.The results of the analysis indicate that the model can reflect the weaken developing creep property of compacted loess.Along with time increaing,the strain increases gradually,but the strain rate reduces gradually.After considering the earth-fill load gradually exerting,the time-gap between two earth-fill load levels and the thickness in the actual project,having made the essential hypothesis,the computational model of settlement process of high loess-filled embankment which combined the layer-wise summation method was proposed.Finally,the model was applied to the actual project.Through the concrete project example,the reliability of the model was confirmed and the serviceability of the model was discussed.

关 键 词：道路工程 经验模型 沉降过程 流变特性 黄土高路堤 

分 类 号：TU443[建筑科学—岩土工程]