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采用随机场理论和数值分析相结合的方法,研究土性参数的空间变异性对盾构隧道施工地表变形的影响。利用协方差矩阵分解法建立描述土性参数空间变异性特征的随机场模型,结合Monte-Carlo策略,采用FLAC3D软件分析弹性模量的变异系数、相关距离对地表变形的影响。研究结果表明:土体弹性模量的空间变异性对地表变形规律有着重要的影响,在变形形态和量值上均有不同程度的体现;根据土体弹性模量的相关距离与隧道直径之间比值的大小关系,总结提出3种地表变形模式;最大地表沉降近似服从对数正态分布,且随着土体弹性模量的变异系数和相关距离的增大,最大地表沉降的概率分布越分散,超出沉降监测控制值的概率逐渐增加。
The random field theory and numerical analysis are combined to study the influence of spatial variability of soil parameters on surface deformation of shield tunneling. The covariance matrix decomposition method was used to establish the random field model describing the spatial variability of soil parameters. The Monte Carlo method was used to analyze the effect of the variation coefficient of elastic modulus and the correlation distance on the deformation of the ground surface using FLAC3D software. The results show that the spatial variability of soil elastic modulus has an important influence on the deformation of the soil surface, with varying degrees of deformation morphology and magnitude. According to the correlation between the soil elastic modulus and the tunnel diameter Three kinds of surface deformation modes are summarized and summarized. The maximum surface subsidence approximately obeys the logarithm normal distribution, and as the coefficient of variation and the related distance of elastic modulus increase, the probability distribution of maximum surface subsidence is more dispersed , The probability of exceeding the settlement monitoring control value gradually increases.