摘要
降雨入渗条件下的裂隙性膨胀土边坡稳定性与其渗流场分布密切相关,对渗流分析中的积水深度进行了数值模拟,结果显示,不同的积水深度对渗流场的影响很小,因此,在进行裂隙性膨胀土渗流分析时,积水深度为0的假定是可以接受的。基于膨胀土开裂裂隙的规模及渗透性的不同,提出了考虑裂隙系统的膨胀土边坡渗流分析方法,计算结果表明,土体开裂显著改变了膨胀土内部的渗流场分布。该方法可以更好地模拟坡渗流场随时间的变化规律,以及更合理地解释了降雨入渗引起的膨胀土边坡浅层滑动机制。
Stability of cracked expansive soil slopes subjected to rainfall infiltration is closely related to seepage distribution. The impact of accumulated water depth on seepage is numerically analyzed. The results show that the impact of accumulated water depth on seepage distribution is very small and the assumption that accumulated water depth is zero can be accepted in seepage analysis. Based on different dimension of cracks and their different permeability of expansive soils,a new method of seepage analysis subjected to rainfall infiltration considering cracks system is presented,which shows that cracking behavior not only has a great effect on seepage distribution,but also much better simulates seepage distribution change with time than before. And the results obtained from engineering cases can reasonably explain the mechanics of shallow landslide of expansive soil slopes.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第S1期281-285,共5页
Rock and Soil Mechanics
关键词
裂隙性膨胀土
饱和-非饱和渗流
降雨入渗
基质吸力
土水特征曲线
cracked expansive soil
saturated and unsaturated seepage
rainfall infiltration
matrix suction
soil-water characteristic curve
