整体与局部强度折减法在边坡稳定分析中的对比研究

Comparative Study on the Application of the Whole Strength Reduction Method and the Local Strength Reduction Method in Slope Stability

基于FLAC3D建立边坡数值模型,分别开展整体强度折减法和局部强度折减法两种方法对边坡稳定性的对比分析,研究两者在不同本构基础、边坡体是否含软弱结构层等因素对边坡的稳定安全系数和极限位移值的影响。研究结果表明:局部强度折减法相对于整体强度折减法更适应于边坡稳定性研究,本构模型的选择对研究边坡稳定性也有着一定影响;软弱结构层是边坡失稳的重要因素,两种强度折减法对含软弱结构层边坡的折减对象是软弱结构层,且所得到的安全系数和位移值基本一致。

In this paper, a slope numerical model is established based on FLAC3 D to analyze the stability of the slope and compare the whole strength reduction method and the local strength reduction method. The effects of the factors such as the different constitutive foundations and the weak structural layers on the stability safety coefficient and the ultimate displacement of the slope are further discussed. The results show that the local strength reduction method is more suitable for the slope stability research than the whole strength reduction method. The choice of the constitutive model also has certain impacts on the stability of the slope. The weak structure layer is an important factor for the slope instability. The weak structural layer is the object of the two strength reduction methods for slopes with weak structural layer. And the obtained safety coefficient and the displacement are basically the same.