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Numerical study on 3D effect and practical design in shield tunneling

Underground Space 2019年第3期4卷 201-209页

作者： Hossain Md.Shahin teruo nakai Tetsuo Okuno Islamic University of Technology GazipurBangladesh Geo-Research Institute Japan Nagoya Institute of Technology NagoyaJapan Shimizu Corporation TokyoJapan

In practice,different design methods are used in solving geotechnical problems depending on the type of issue such as the tunneling,braced excavation,or bearing capacity of a foundation,that is,the basic mechanism of the design method differs depending on the problems even for the same ground.A numerical analysis using the finite element method has recently become familiar owing to an improved computing performance;however,it is not widely used in the design of geotechnical problems including tunnel excavation owing to the reliability of the constitutive model of the ground *** a constitutive model of soils can properly express the properties of the ground material,a numerical analysis will play a vital role in solving the geotechnical *** this paper,the current state of a numerical analysis and its applicability in tunnel design are ***,the simulation of the ground behavior during tunnel excavation is carried out using sandy and clay ground parameters for shallow and deep tunnel *** paper is mainly focused on the effects of tunnel excavation under three-dimensional(3D)conditions,as well as the current design ***-linear 2D and 3D finite element analyses have been conducted,in which the elastoplastic sub-loading tij model has been used as a constitutive model of the *** performance and acceptability of the constitutive model have already been proven to reproduce the results of various model tests on different geotechnical problems such as the tunneling,braced excavation,and bearing capacity of a foundation,as well as the measured field *** was found that a 2D finite element analysis where the rate of stress release is considered,can be used for the prediction of the ground deformation and surface settlement;however,it does not provide rational information in the prediction of tunnel lining forces such as the stress,bending moment,and axial force,which emphasize the necessity of a 3D analysis with a proper cons

关键词： Shield tunneling Finite element analysis 3D effect

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超固结粘土的剪切带数值模拟

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岩土力学 2006年第1期27卷 61-66页

作者：徐连民朱合华中井照夫西村智同济大学上海200092 名古屋工业大学

基于中井的子负荷面本构关系模型,采用高精度的隐式应力积分算法,研究了平面应变试验中超固结粘土试样的变形局部化问题。模拟了不同的加载速度和边界约束条件,得到了超固结比为8的藤森粘土土体内部明显可见的X型剪切带和单一型剪切带... 详细信息

基于中井的子负荷面本构关系模型,采用高精度的隐式应力积分算法,研究了平面应变试验中超固结粘土试样的变形局部化问题。模拟了不同的加载速度和边界约束条件,得到了超固结比为8的藤森粘土土体内部明显可见的X型剪切带和单一型剪切带。结果表明:土体的剪胀特性、孔隙水在土体内的移动规律以及边界约束条件对剪切带的形成和发展起着控制作用。

关键词：本构关系模型局部化剪切带超固结粘土

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