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采用局部平均细分法表征土体抗剪强度参数空间变异性,自开发随机有限元程序并结合有限元强度折减法对湖南古丈县二龙庵滑坡进行局部随机场展开随机分析.结果表明:局部随机场展开可以用于分析各土层参数对滑坡的影响,在不同c变异水平下的滑坡失效概率基本为0;随着φ变异水平增大,滑坡失效概率逐渐增大,并且与第3层土相比,第2层土对滑坡影响比较大,因此有必要对该层土的参数进行更加精准的测量以便获得更加可靠的稳定性分析结果.
The local average subdivision method is used to characterize the spatial variability of soil shear strength parameters. Random stochastic field analysis of Erlongan landslide in Guzhang County of Hunan Province is carried out by means of random finite element program and finite element strength reduction method. The results show that: The local random field expansion can be used to analyze the influence of soil parameters on the landslide. The probability of landslide failure under different c-variation levels is almost zero. With the increase of φ variation, the probability of landslide failure gradually increases, The second soil layer has a greater impact on the landslide than the second soil layer, so it is necessary to make more accurate measurements of the soil parameters in order to obtain more reliable stability analysis results.