排水工程顶进施工对相邻城轨桥梁基础位移影响分析numerical.pdfVIP

排水工程顶进施工对相邻城轨桥梁基础位移影响分析 刘玉洲 （铁道第三勘察设计院集团有限公司，天津 300142） 摘要：管道顶进施工和基坑开挖时临近城轨的基础受到影响，基础产生附加变形。本文以某排水工程的顶进施工 为背景，采用Midas-GTS 有限元软件，建立了结构的三维有限元模型，考虑了土体与桩基之间的非线性关系，模 拟了排水管道顶进施工过程，得到了排水管顶进施工过程中对既有城轨桥梁基础的位移影响数值，概括了工程施 工引起的既有桥梁基础变形的变化规律，通过模拟分析，取得了工程施工对既有桥梁基础影响的基本认识。 关键词：有限元；基坑开挖；顶进施工；基础位移 Numerical Analysis of the Influence of Pipe Jacking Construction of Drainage toward Adjacent Light Railway Bridge Foundation LIU Yuzhou (The Third Railway Survey and Design Institute Group Corporation, Tianjin 300142,China) Abstract: The bridge foundation will be influenced during the process of adjacent pipe jacking construction and excavation, then lead to additional deformation of the bridge foundation. Taking a drainage pipe jacking construction as the background, using Midas-GTS as the finite element analysis software to build the 3D-model, taking the non-linear relationship between the soil and the pile into account to simulate the pipe jacking construction, then we can get the displacement of the existing bridge foundation during the process of the pipe jacking construction, summarizes the variation of the deformation of existing bridge foundation due to the pipe jacking construction. Through the simulation analysis, we can achieve a basic understanding of the existing bridge foundation affected by construction, which offers some theoretical direction for engineering design and construction. Keywords: excavation, jacking construction , foundation displacement, finite element 1 前言 随着地方经济发展和基础设施建设的加快，城市内为节约现有土地资源，近距离并行、上跨或下穿既 有城市桥梁项目与日俱增。新建项