公路黄土地基流变模型研究  

Research on Rheological Model of Highway Loess Subgrade

作　　者：颜斌[1] 倪万魁[1] 刘海松[1] 

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710054

出　　处：《中国公路学报》2009年第4期15-19,共5页China Journal of Highway and Transport

基　　金：国家西部交通建设科技项目(200131836115);冻土工程国家重点实验室项目(SKLFSE200702)

摘　　要：为了研究公路黄土地基在上部荷载作用下的蠕变规律、工后沉降以及相应处理措施,通过原位静力荷载试验,对其流变曲线进行粘弹粘塑性分析,并应用附加应力原理,求取一定高度路堤下地基土体的最终沉降变形公式。结果表明:流变曲线主要分初始蠕变和稳定蠕变2个阶段,流变模型包含了粘性、弹性、塑性3个部分,当时间趋于无穷大时,其荷载与应变呈幂函数关系;当路堤高度H≤3 m时,可采用一般压实机械处理地基;当3 m<H≤6 m时,可采用中等压实机械处理地基;当H>6 m时,应采用重型压实机械处理地基。In order to study creep law, post-construction settlement and corresponding treatment of highway loess subgrade under effect of upper load, authors analyzed rheological curves with the viscoelasticity and viscoplasticity through in-situ static load test. According to principle of additional stress, authors presented the final deformation formula as to a certain embankment height H. The result indicates that rheological curves include initial creep stage and steady creep stage; rheological model includes viscosity, elasticity and plasticity; when the time tends towards infinity, load and strain submit to power function relationship. When H≤3 m, general compacting machinery should be adopted; when 3 m〈H≤6 m, middling compacting machinery should be adopted;when H〉6 m, heavy compacting machinery should be adopted.

关 键 词：道路工程 黄土地基 静力荷载试验 流变模型 粘弹粘塑性分析 

分 类 号：U416.16[交通运输工程—道路与铁道工程]