软土地区基坑开挖对临近高铁影响数值仿真分析

发布时间：2018-02-23 05:32

本文关键词： 基坑开挖高速铁路路基和框构桥数值仿真有限元　出处：《铁道工程学报》2014年02期 　论文类型：期刊论文

【摘要】：研究目的:随着临近高铁的上跨和下穿道路工程日益增多,大量新建道路等基坑工程位于高铁路基或桥梁保护范围以内,使得高铁结构不可避免地受到基坑施工的影响,在软土地区更为严重。本文以天津地区临近某高铁的道路下穿高铁工程为背景,运用ABAQUS软件建立三维数值分析模型,对不同距离、不同挖深、不同封闭式路堑节段的基坑施工过程进行了数值仿真分析。研究结论:(1)基坑施工引起的高铁路基和框构桥梁的附加差异沉降量、轨道的平顺性均满足规范要求。基坑开挖会引起高铁路基和框构桥的隆起变形,封闭式路堑浇筑后隆起变形减小;(2)施工过程中,基坑开挖为关键风险阶段,当施工至远离高铁72 m以外的基坑时,剩余节段施工对高铁基本无影响;(3)施工过程中应尽量减小每次的开挖量,按照每节独立开挖浇筑的工序进行,尽可能地将施工影响控制在极小的范围内,以免影响铁路运营的安全性和舒适性;(4)本文研究成果可以为临近高铁工程建设提供一定的理论依据,对软土地区临近高铁的基坑开挖有一定的参考意义。
[Abstract]:Research purpose: with the increasing number of upper span and lower crossing road projects near high speed rail, a large number of newly built roads and other foundation pit projects are located within the protection scope of high-speed railway subgrade or bridge, which makes the high-speed railway structure inevitably affected by foundation pit construction. It is more serious in the soft soil area. In this paper, based on the high-speed railway project near a certain high-speed railway in Tianjin area, a three-dimensional numerical analysis model is established by using ABAQUS software. Numerical simulation analysis of foundation pit construction process of different closed cut segments is carried out. Conclusion: 1) additional differential settlement of high-speed subgrade and frame bridge caused by foundation pit construction. The smoothness of track meets the requirements of the code. Excavation of foundation pit will cause uplift deformation of high speed subgrade and frame bridge. In the process of construction, excavation of foundation pit is a key risk stage. When the foundation pit is far away from the high-speed rail 72 m, the remaining section construction has no effect on the high railway. During the construction process, the amount of each excavation should be reduced as far as possible, according to the separate excavation and pouring process of each section. In order to avoid affecting the safety and comfort of railway operation, the research results of this paper can provide a certain theoretical basis for the construction of adjacent high-speed railway projects. It has certain reference significance for excavation of foundation pit near high-speed railway in soft soil area.
【作者单位】：铁道第三勘察设计院集团有限公司;
【分类号】：TU753

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