成层介质边坡渗流稳定性计算方法初步研究  

A preliminary study of the calculation method for seepage stability in the layered slope

作　　者：黄立明[1] 陈征宙[1] 张崇波[1] 张军[1] 

机构地区：[1]南京大学地球科学与工程学院,江苏南京210046

出　　处：《水文地质工程地质》2015年第3期59-63,91,共6页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金资助项目(41272313)

摘　　要：在由多层渗透系数不同的岩土材料构成的成层介质边坡中,渗流在穿过两层岩土材料之间的边界时会发生折射,渗流力的大小和方向均发生变化,并符合渗流折射定律。通过分析成层介质边坡中的渗流场,根据渗流折射定律,推导每个土层内渗流力的方向和大小,得出接近实际情况的初步简化计算结果。结合算例,对比渗流发生折射前后的计算结果,发现当下层土的渗透性系数小于上层土时,随着下层土与上层土的渗透系数比值的降低,渗流力在下层土中产生的垂直、平行于滑动面的分力会达到上层土中该分力的100倍以上。According to the refraction law of groundwater seepage,the direction of seepage will refract when water passes through the boundary between two soil layers of different hydraulic conductivities and both of the quantity and direction of the seepage force will change. Through an analysis of the seepage field along with the refraction law,the seepage force vector in each soil layer of the layered slope are provided,which are simplified results close to the reality. An calculation example is carried out and the results show that when hydraulic conductivity of the subsoil is smaller than that of the topsoil and with the decreasing ratio of the subsoil hydraulic conductivity to the topsoil hydraulic conductivity,the component of the seepage force parallel and perpendicular to the slip surface in the subsoil will be 100 times larger than that in the topsoil layer. The formula of the overall stability of layered slope can also be obtained.

关 键 词：边坡稳定性 渗流力 成层介质边坡 渗流折射 

分 类 号：TU457[建筑科学—岩土工程]