摘要
以内马铁路某段路堤工程为依托,构建非饱和土路堤降雨-渗流-应力耦合模型,反演降雨环境下路堤边坡的饱和度、孔隙水压力和变形过程,探讨其稳定性。结果表明:随着降雨时间的增加,路堤表层土体的饱和度、孔隙水压力以及变形范围呈递增趋势,但考虑植被的蒸腾作用时可以减缓上述趋势;降雨入渗主要通过改变表层土体的饱和度、孔隙水压力以及渗流压力来影响路堤的稳定性,具体表现为路堤边坡稳定系数的降低,随着降雨时间的增加,路堤边坡的稳定性持续降低,但同等条件下增加植被防护会提高路堤边坡的稳定性。
Based on a section embankment engineering of Nariobi—Malaba Railway, the rainfall-seepage-stress coupling model of unsaturated soil embankment is established to invert the saturation, pore water pressure and deformation process of embankment slope under rainfall environment, and its stability is also discussed. The results show that the saturation, pore water pressure and deformation range of embankment surface soil increase with the increase of rainfall time, but the above trend can be slowed down by considering the transpiration of vegetation. Rainfall infiltration mainly affects the stability of embankment by changing the saturation of surface soil, pore water pressure and seepage pressure. Specifically, the stability coefficient of embankment slope decreases. With the increase of rainfall time, the stability of embankment slope continues to decrease, but the increase of vegetation protection under the same conditions will improve the stability of embankment slope.
作者
张云
孟晓鹏
ZHANG Yun;MENG Xiaopeng(China Road&Bridge Corporation,Beijing 100010,China)
出处
《路基工程》
2022年第2期119-124,共6页
Subgrade Engineering
基金
中国交建重大基础研究发展项目(2017-ZJKJ-08)。
关键词
非饱和土路堤
降雨
植被蒸腾作用
渗流-蒸腾-应力耦合
饱和度
孔隙水压力
变形
稳定性
unsaturated soil embankment
rainfall
transpiration of vegetation
seepage-transpiration-stress coupling
saturation
pore water pressure
deformation
stability
