【摘要】 降雨往往是引起热带和亚热带膨胀土、残积土边坡失稳的主要促发因素,考虑降雨影响的土坡稳定性预测预报是一个亟待解决的复杂的工程问题。简要介绍了一套能考虑气候影响的非饱和土边坡稳定性分析的极限平衡分析方法和一套可考虑土体非线性和几何非线性的边坡稳定分析及变形计算的有限元方法。提出了一个降雨条件下土质边坡稳定性预测预报模型,其具体思路是:首先用数值方法计算渗流场,然后利用非饱和土的强度理论推求出整个场的强度分布,再利用极限平衡分析方法或有限元方法进行边坡稳定性分析,寻求斜坡稳定安全因数与降雨特征参数(雨强,降雨持时等)相关关系,如此,即可依据气象预报进行土坡稳定性预报。更多还原

【Abstract】 Rainfall is often the major factor causing the slope failure of expansive soils and residual soils in tropical regions or subtropical regions;and the prediction of stability concerning climate for slope is complex and needs to be taken into consideration urgently.A limit equilibrium method and a finite element method for unsaturated slope stability analysis concerning climate have been introduced briefly.A prediction model,based on mechanical analysis,of slope stability due to permeation of rainwater has been proposed.The prediction of slope stability according to weather forecast can be realized as the following steps:first,to compute the seepage field by numerical method;second,to derive the strength distribution of slope from the seepage field by the strength theory of unsaturated soil;third,to analyze the slope stability by limit equilibrium method or finite element method;at last,the relationship between the safety factors of slope stability and rainfall parameters,such as intensity and duration of rainfall,can be obtained.更多还原