邻近桥桩地铁盾构隧道变形规律及力学行为分析

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英文篇名：Analysis on Deformation and Mechanical Behavior of Shield Tunnel near Bridge Pile 作者：于德海 ; 张涛 英文作者：YU Dehai;ZHANG Tao;Institute of Road and Bridge Engineering,Dalian Maritime University;Ningxia Highway Survey and Design Institute; 关键词：地铁盾构 ; 桥桩 ; 变形规律 ; 力学行为 英文关键词：metro shield;;bridge pile;;deformation law;;mechanical behavior 中文刊名：YJGX 英文刊名：Journal of Basic Science and Engineering 机构：大连海事大学道路与桥梁工程研究所;宁夏公路勘察设计院有限责任公司; 出版日期：2019-06-15 出版单位：应用基础与工程科学学报 年：2019 期：v.27 基金：国家自然科学基金项目(41572248,40902075) 语种：中文; 页：YJGX201903007 页数：8 CN：03 ISSN：11-3242/TB 分类号：82-89

摘要

以大连地铁2号线香沙区间盾构隧道下穿铁路桥特殊地段为依托,通过三维有限元程序仿真模拟以及工程现场动态监测对比,研究盾构开挖对邻近桥梁地层及基础变位的影响.结果表明:地层沉降整体为一个凹槽形,即隧道中心线地层沉降大,隧道两边沉降较小,按隧道横截面轴线左右对称;桩周土随着隧道开挖呈下沉趋势,且桩周土的沉降明显小于桥桩的沉降;初始桩上部存在负摩阻力,成为施加在桩上的外荷载,随着隧道开挖的进行,负摩阻力逐渐消失,全部转变为正摩阻力,且正摩阻力的数值比负摩阻力大.研究成果可为相似条件下地铁盾构的稳定控制提供依据.
        The research on shield tunnel of Xiang-Sha bid section of Dalian metro is carried out to analyze the the effect of ground settlement by three-dimensional finite element,combined with on-site monitoring data.The results show that the groove-shaped subsidence is large at the centre of the tunnel,and it decreases on two sides,the settlement curve is basically symmetrical,which accords with the subsidence mechanism of the ground and is consistent with the on-site monitoring data; the settlement of soil around pile is obviously smaller than that of bridge pile,there is the differential settlement between pile foundation and soil,and the friction of the pile is changed; with the excavation of tunnel,the negative frictional resistance of pile disappears gradually,and becomes positive friction resistance,positive friction resistance is larger than negative friction resistance.Research results can provide the theoretical basis and technical support for the stability of metro shield under similar conditions.

引文

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