摘要
为得到降雨因素对红砂岩风化土路基边坡稳定性的影响规律,对某高速公路路基剖面进行建模,基于非饱和土理论,运用ABAQUS有限元软件进行降雨条件下的渗流场数值计算,分析了降雨强度、降雨时长对路基边坡的稳定影响。结果表明:随着降雨时长、降雨强度的增大,红砂岩风化土的饱和度会增大,路基边坡的安全系数呈现下降趋势,但降雨初期对边坡的影响较大,随着持续的降雨,红砂岩风化土逐渐趋于饱和,边坡安全系数下降幅度趋缓;降雨会导致路基顶部下沉,坡脚发生大的水平位移,稳定性大幅下降,进而导致路基失稳。
In order to obtain the influence law of rainfall factors on the stability of subgrade slope of red sandstone weathered soil,the subgrade profile of an expressway was modeled.Based on the theory of unsaturated soil,the numerical calculation of seepage field under the condition of rainfall was carried out by ABAQUS,and the influence of rainfall intensity and duration on the stability of subgrade slope was analyzed.The results show that with the increase of rainfall duration and rainfall intensity,the saturation of weathered red sandstone soil will increase,and the safety factor of subgrade slope will show a downward trend,but the initial impact of rainfall on the slope will be greater,with continuous rainfall,the red sandstone weathered soil gradually becomes saturated,and the slope safety factor declines gradually.Rainfall will cause the top of the subgrade to sink,a large horizontal displacement at the foot of the slope,the stability will be greatly reduced,and then the subgrade will be unstable.
作者
王超
温树杰
宋亮亮
WANG Chao;WEN Shu-jie;SONG Liang-liang(School of Architecture and Surveying Engineering,Jiangxi University of Science and Technology,341000,Ganzhou,Jiangxi,China;Jiangxi Provincial Key Laboratory of Environmental Geotechnical Engineering and Disaster Control,Jiangxi University of Science and Technology,341000,Ganzhou,Jiangxi,China)
出处
《建筑技术》
2020年第9期1067-1071,共5页
Architecture Technology
基金
国家自然科学基金项目(51304084)。
关键词
降雨
红砂岩风化土
渗流
路基边坡
稳定性
rainfall
red sandstone weathering soil
seepage
roadbed slope
stability
