常规和广义反应位移法在浅埋双圆盾构隧道中的应用比较

发布时间：2018-02-25 04:10

本文关键词： 双圆盾构隧道抗震分析反应位移法广义位移法应用比较　出处：《现代隧道技术》2017年04期 　论文类型：期刊论文

【摘要】：文章阐述了常规反应位移法的基本原理、分析方法及其存在的问题,给出了常规反应位移法地层结构滑移和不滑移两种假定下的地层弹簧刚度取值公式,并提出了基于地层-结构模型的有限元广义反应位移法。该法的地震强制位移施加在地层左右两侧边界上,两侧边界受到水平滑移支座约束,底部基岩边界受到固定支座约束,并在结构地层界面之间引入摩擦接触单元模拟界面滑移效应。不同界面条件下,双圆盾构隧道采用常规反应位移法和有限元广义位移法的对比表明:考虑界面滑移的有限元广义位移法能更加真实地反映双圆盾构隧道的地震效应;在地震强制位移作用下,双圆盾构隧道两洞管片衬砌附加弯矩为倾斜的8字形分布,中柱附加弯矩为线性分布,反弯点出现在中柱中点附近;管片上附加轴力基本为压力,中柱附加轴力为拉力且沿高度基本不变;管片上附加剪力为正8字形分布,中柱附加剪力沿高度基本不变。
[Abstract]:In this paper, the basic principle, analysis method and existing problems of conventional reactive displacement method are described, and the formula of formation spring stiffness under the assumption of slip and non-slip of formation structure by conventional reactive displacement method is given. A finite element generalized response displacement method based on stratigraphic-structural model is proposed. The seismic forced displacement is imposed on the boundary of the left and right sides of the stratum, which is constrained by the horizontal slip bearing, and the boundary of the bottom rock is constrained by the fixed support. At the same time, friction contact element is introduced to simulate the slip effect of the interface between the structural strata. The comparison of conventional response displacement method and finite element generalized displacement method for double circular shield tunnel shows that the finite element generalized displacement method considering interface slip can reflect the seismic effect of double circular shield tunnel more truthfully, and under the action of earthquake forced displacement, the finite element generalized displacement method can reflect the seismic effect of double circular shield tunnel more truthfully. The additional bending moment of the lining of the double circular shield tunnel is 8 zigzag distribution, the additional moment of the middle column is linear distribution, the reverse bending point appears near the center point of the middle column, the additional axial force on the segment is basically pressure, The additional axial force of the middle column is tensile force and the height of the middle column is almost unchanged, the additional shear force on the segment is a positive 8-shaped distribution, and the additional shear force of the middle column is basically unchanged along the height.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;
【基金】：国家自然科学基金资助项目(51178400,U1134208) 教育部新世纪人才资助项目(NCET-11-0713)
【分类号】：U455.43

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