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.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
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)
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
road engineering
loess subgrade
static load test
rheological model
viscoelastic-vis-coplastic analysis
