降雨型堆积层滑坡特征及稳定性分析

堆积层滑坡是滑坡的一种基本类型，其物质组成、结构等有别于其它类型滑坡。堆积层滑坡失稳绝大多数是由降雨或地下水位的变化而引起的，在降雨诱发堆积层滑坡稳定性分析中，必须考虑渗透力的作用。系统分析了堆积型滑坡发育环境及特征，推导了基于总应力法和有效应力法的可考虑渗透力的传递系数法，采用有效应力法计算滑坡稳定系数时，既要考虑地下水浮力作用，又要考虑地下水流动时的渗透力作用；采用总应力法计算滑坡稳定系数时，仅需考虑地下水流动时的渗透力作用。对一个工程实例进行了深入剖析，验证了考虑渗透力的传递系数法的可靠性。

Features and stability analysis of rainfall-induced colluvial landslides

The colluvial landslide is a kind of basic type of landslides; and its matter component and structure are different from other type landslides. The slope instability of colluvial landslide mostly is induced by rainfall or change of groundwater level; and groundwater plays a fateful role in the slope instability, therefore, the seepage action should be considered in the landslide stability analysis. The growth environment and characteristic of a colluvial landslide is analyzed systematically. Based on total stress method and effective stress method, a transfer coefficient method with considering seepage forces for landslide stability analysis is established. Adopting effective stress method to calculate the landslide stability factor, both the buoyancy force of groundwater to soil and seepage force should be considered; and adopting effective stress method to calculate the landslide stability factor, only seepage force should be considered. At last, an example is thoroughly analyzed; and the result shows that the transfer coefficient method with considering seepage forces for landslide stability analysis is reliable.