基于随机场理论的盾构隧道地表变形分析

doi:10.13722/j.cnki.jrme.2016.0099

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摘要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。

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	程红战
	陈健
	李健斌
	胡之锋
	李建贺
	黄珏皓

关键词 ：隧道工程, 盾构隧道, 随机场, 空间变异性, 地表变形, 概率分析

Abstract：Random field theory and numerical analysis method are combined to investigate the influence of the spatial variability of material properties on surface deformation caused by shield tunneling. Random fields of elasticity modulus are generated by Covariance Matrix Decomposition method to model the characteristics of spatial variability. Within Monte-Carlo framework，FLAC3D is used to analyze the influence of coefficient of variation and correlation distance of elasticity modulus on surface deformation. The results show the spatial variability of elasticity modulus has significant effects on both the values of greenfield settlement and the shapes of settlement trough. Depending on the relative size ratio between correlation distance and tunnel diameter，three surface deformation patterns are identified. The distribution of maximum surface settlement follows an approximate lognormal distribution. With coefficient of variation and correlation distance increasing，the more scattered the probability distribution of the maximum surface settlement，and the larger the probability of surface settlement exceeding the critical value.

Key words： tunnelling engineering shield tunnel random field spatial variability surface deformation probability analysis

引用本文:

程红战，陈健，李健斌，胡之锋，李建贺，黄珏皓. 基于随机场理论的盾构隧道地表变形分析[J]. 岩石力学与工程学报, 2016, 35(S2): 4256-4264.
CHENG Hongzhan，CHEN Jian，LI Jianbin，HU Zhifeng，LI Jianhe，HUANG Juehao. Study on surface deformation induced by shield tunneling based on random field theory. , 2016, 35(S2): 4256-4264.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0099 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/4256

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