摘要
基于多孔介质饱和-非饱和渗流理论和非饱和土抗剪强度理论,采用极限平衡法与降雨渗流有限元相结合的方法,研究土水特征曲线对降雨边坡渗流场和稳定性的影响。采用不同的土水特征曲线对边坡渗流场和安全系数的计算影响较大,其影响程度随土体亲水性能的增加而增加,黏土类类边坡安全系数下降幅度为24.4%。安全系数的降低主要是由于边坡土体基质吸力的丧失而引起,同时,滑动体的形状也与基质吸力下降的情况有很大关系。黏土类类边坡在强降雨之初容易发生浅层破坏,随着降雨入渗的继续,滑动面由浅层转为深层。
Based on the saturated-unsaturated seepage theory of porous material and the unsaturated soil shear strength theory,we study the influence of SWCC on safety coefficient and seepage field of slope under rainfall infiltration using the limit equilibrium method and the FEM of rainfall infiltration.It is found that SWCC affects the slope seepage field and the safety coefficient significantly,and the safety coefficient increases with increasing of soil hydrophilic property,especially the safety coefficient of slope with A-type SWCC decreases by 24.4%.The decrease of safety coefficient mainly arises from comedown of matric suction that is found to be related with the shape of sliding surface.At the beginning of a heavy rainfall,the shallow layer of the slope with A-type SWCC is prone to slip down,and further with the rain process,the sliding surface transfers from the shallow layer to deep layer.
出处
《人民长江》
北大核心
2013年第15期47-51,共5页
Yangtze River
基金
江西省交通厅科技项目(2012C0003
2011H0023)
作者简介
邓通发，男，讲师，博士研究生，主要从事土木工程专业的教学和科研工作。E—mail：dbdtf@163．com
