碎石土古滑坡体水理性质与稳定性分析

Analysis of water physical properties and stability of an ancient landslide

碎石土古滑坡体水理性质特殊,特别是对强降雨的响应。大量工程经验表明,堆积体斜坡具有高渗透性、强贮水性及吸水性等诸多水理特性,这些特性主要受控于土体中各种孔隙、裂隙以及土体矿物成分等。堆积体斜坡对降雨响应过程中形成的暂态饱和区是浅层易滑区。表层发育有一定厚度土层的斜坡,可以防止滑带水分的过度蒸发,保证了滑带内的水-岩化学作用在时间上,尤其是无降水入渗的旱季的连续性。对堆积体稳定性不利。

Soil hydraulic behavior on an ancient landslide mass is extraordinary, especially its reaction to replenished precipitation. A large number of engineering experience shows that soil of an ancient landslide mass slope has many kinds of features such as high permeability, strong storability and hydroscopicity. These properties are mainly controlled by vari- ous soil pores, cracks, soil mineral compositions etc.The immediate saturated zone of the landslide mass slope during the rainy season is an easily-slided area. The slope which is covered by a certain thickness of well-vegetated soil can prevent excessive evaporation of water in saprolite layer. Thus ensures a continuation of the water-rock interaction under different conditions, especially during the dry season when there is no infiltration of precipitation. This does bad to the stability of an ancient landslide mass