降雨入渗条件下边坡稳定性研究现状及展望

本文总结了国内外对大气降雨引起边坡变形失稳现象的研究进展与现状,一是利用野外观测与试验研究分析,借助数学统计分析方法寻求降雨与边坡稳定性之间的相关规律,其最大优点是仅仅依赖于历史数据或试验数据,不需考虑降雨在岩土体中的作用和滑坡自身的演变过程,归纳出相关关系可作为本地区或本边坡的中短期滑坡预测和预防;二是分析降雨入渗引起边坡失稳的物理过程并建立定量的模型进行数值模拟,其最大优点是对边坡各种岩土的类型、土的入渗能力、土的初始饱和度、土层深度、水文地质条件、边坡长度、降雨持时、降雨强度、暴雨前降雨量、间歇性降雨以及坡面防渗等情况进行适当考虑,其关键是准确获取这些参数值。最后总结了这个问题的进一步研究方向与目标。

COMPREHENSIVE EVALUATION OF SLOPE STABILITY UNDER RAIN INFILTRATING

This paper summarizes the research progress and present state about the phenomena of slope deformation and destabilization caused by rainfall.On the one hand,by means of field observation and test research,the correlation rules of rainfall and slope stabilization by assisting mathematic statistical methods are expanded in detail.This method can induce the correlation rules to forecast and prevent the landslide only based on the history or test data without considering the rainfall effect in rock and the process of landslide,which is its best merit.On the other hand,the physical progress of slope destabilization by rain infiltrating is analyzed and the quantitative model to numerical simulation is established based on rock types,soil penetrability,soil initial saturation,soil depth,hydrological geology condition,slope length,rainfall times,rainfall intensity,quantity of rainfall before storm rainfall,intermittent rainfall,and impervious condition,which are the key points to obtain all values accurately.At last,the research orientation and aim are summarized prospectively.