公路跑道粉砂土路基地震液化及稳定性研究  

Seismic Liquefaction and Stability Analysis of Highway Runway Silt Soil Subgrade

作　　者：郑元勋[1] 黄静卿[1] 

机构地区：[1]郑州大学水利与环境学院,河南郑州450002

出　　处：《郑州大学学报（工学版）》2012年第5期61-65,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：中国博士后面上基金资助项目(20110491008);港口海岸及近海工程国家重点实验室开放基金(LP1113);河南省教育厅科学技术研究重点项目资助(12A580003)

摘　　要：依托实际工程,利用FLAC计算程序,分别基于库伦模型和Byrne模型对地震荷载作用下公路跑道粉砂土路基的地震响应进行了分析,详细分析了地震强度对粉砂土路基地震响应的影响.研究结果表明:当只考虑路堤下粉土为库伦模型时,路基不会出现液化,但是路基坡脚处可能出现瞬时屈服.当考虑路堤材料为液化模型时,路面有可能处于受拉状态,路堤底部有可能屈服,路基土有可能产生液化.随着加速度峰值的增加,路堤内拉力区和屈服区的范围增大,液化出现的可能性也增大,尤其当地震加速度达到0.1g时,路基土存在液化的可能性.In this paper, seismic response of highway runway silt subgrade is analyzed under seismic loads re- spectively based on the coulomb＇ s model and Byrne model with FLAC calculation program based on the practi- cal project. And the influence of seismic intensity on silty soil subgrade seismic response is analyzed in detail. The results show： the roadbed will not be liquefied, when only considering silty soil for the coulomb＇ s model, but instantaneous yield may appear at subgrade slope feet. When we consider embankment material for lique- faction model, the pavement may be in a state of tension, embankment bottom may yield, and this may pro- duce subgrade soil liquefaction. Along with the increase of the acceleration peak, the extent of the tension and yield area increases inside the embankment, the likelihood of liquefaction increases, especially when the earthquake acceleration reaches to 0.1 g, the potential existence of liquefaction of subgrade soil might appear.

关 键 词：粉砂土 公路跑道 地震荷载 动力响应 液化 

分 类 号：U416.2[交通运输工程—道路与铁道工程]