摘要
对扬州地区典型黏性土进行了土水特征曲线试验研究,分析了干密度对土水特征曲线的影响。试验表明：土的初始干密度越大,进气值越大,脱水速率越小。采用Fredlund和Xing三参数模型计算得土水特征曲线方程,并推算出非饱和土的渗透系数曲线。通过对降雨入渗条件下的扬州地区典型黏性土边坡进行稳定性分析。结果表明：同等基质吸力下,非饱和土体积含水率越大,渗透系数越大;土体进气值越大,同等基质吸力下渗透系数越大,边坡越稳定;扬州地区黏性土体遭遇特大暴雨时,降雨4 d后边坡安全系数下降30%-50%,滑动面位于边坡表层。
A series of tests were conducted to analyze the characteristics of the cohesive soil in Yangzhou area,as well as the influence of different dry density and different soil on soil-water characteristic curve. The results suggest that the larger the initial dry density of soil is,the greater the value of the air entry,and the smaller the rate of dehydration. And then the equation of soil-water characteristic curve was obtained by adopting three parameter model of Fredlund and Xing,through which the curve of the permeability coefficient of unsaturated soil was calculated.The stability analysis of a typical cohesive soil slope in Yangzhou in the condition of rainfall infiltration indicates that with the same test material,the greater the water content of the unsaturated soil mass,the larger the permeability coefficient; the greater the depth of rainfall infiltration,the greater the air entry value,the greater the permeability coefficient,therefore the more stable the soil slope is. After 4 days of heavy rainfall in Yangzhou,The cohesive soil slope safety coefficient dropped 30% - 50%,The sliding surface was on the slope surface.
出处
《水利与建筑工程学报》
2015年第2期73-77,共5页
Journal of Water Resources and Architectural Engineering
基金
岩土力学与堤坝工程教育部重点实验室开放基金(GH201304)
关键词
非饱和土
土水特征曲线
降雨入渗
边坡稳定
unsaturated soil
soil-water characteristic curve
rainfall infiltration
slope stability
