基于随机场理论的盾构隧道地层扰动分析  

Stratum disturbance induced by shield tunnels based on random field theory

作　　者：易顺 潘家军[1] 王艳丽[1] 景锋[2] 张宇 YI Shun;PAN Jiajun;WANG Yanli;JING Feng;ZHANG Yu(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China;Wuhan Changjiang Engineering Technology Company,Yangtze River Scientific Research Institute,Wuhan 430010,China;CTG Wuhan Science and Technology Innovation Park,China Three Gorges Corporation,Wuhan 430010,China)

机构地区：[1]长江水利委员会长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [2]长江科学院武汉长江科创科技发展有限公司,湖北武汉430010 [3]中国长江三峡集团有限公司中国三峡武汉科创园,湖北武汉430010

出　　处：《岩土工程学报》2024年第S02期124-129,共6页Chinese Journal of Geotechnical Engineering

基　　金：中央级科研院所基本科研业务费项目(CKSF2023318/YT)。

摘　　要：盾构开挖不可避免会造成周围地层扰动,引起地表及深部地层发生变形,变形过大时会威胁到周围建构(筑)物的安全,因而有必要开展隧道施工地表及地层变形扰动方面的研究。首先在土体均质条件下,开展二维数值计算,并分别利用Peck公式拟合优度和多项式拟合优度来评价水平向地层和竖向地层的变形扰动程度;继而考虑土体参数空间变异性,借助Monte Carlo策略,开展盾构施工对地层扰动规律影响研究的随机性分析。研究结果表明:Peck公式拟合优度可以较好地反映施工引起水平地层沉降变形程度;多项式拟合优度可以较好地反映竖向地层水平变形受到施工的影响程度;土体模量空间变异性会对盾构隧道施工地层扰动产生较大的影响,模量较大时会对盾构施工地层扰动有一定的“抑制”作用,但总体上越靠近盾构隧道,地层受到扰动越大。研究可以为类似工程的设计和施工提供有益的参考。The shield tunnel will inevitably cause the disturbance of the surrounding stratum and lead to the deformation of the surface and deep strata.Too large deformation of the surface and strata will threaten the safety of the surrounding construction.Therefore,it is necessary to carry out the studies on the disturbance of the surface and strata in tunnel construction.Firstly,under homogeneous soil conditions,two-dimensional numerical calculation is conducted,and the goodnesses of fit of the Peck's formula and polynomials are used to evaluate the degree of deformation disturbance of the horizontal and vertical strata,respectively.Then,considering the spatial variability of soil parameters,within the Monte Carlo framework,the random analysis is performed for the influences of shield construction on stratum disturbance.The results show that the goodness of fit of the Peck's formula can well reflect the degree of settlement of the horizontal strata induced by tunnels.The goodness of fit of the polynomials can well reflect the degree of horizontal deformation of the vertical strata affected by the construction.The spatial variability of soil modulus has a great impact on the stratum disturbance induced by the shield tunnel,and the larger modulus will restrain the disturbance induced by the shield tunnel,but on the whole,the greater stratum disturbance will occur when it is closer to the shield tunnel.The results can provide a useful reference for the design and construction of similar projects.

关 键 词：盾构隧道 深部地层 变形扰动 拟合优度 空间变异性 随机场 

分 类 号：TU43[建筑科学—岩土工程]