地铁隧道下穿施工对既有地铁车站及高架桩基的影响分析
李志敏
Influence Analysis of Metro Tunnel Underground Construction on Existing Metro Station and Viaduct Pile Foundation
LI Zhimin
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作者信息:中铁第四勘察设计院集团有限公司，430063，武汉
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Affiliation:China Railway Siyuan Survey and Design Group Co., Ltd., 430063, Wuhan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.06.034
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中图分类号/CLCN:TU433;U231.4
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栏目/Col:研究报告
摘要:
［目的］研究地铁隧道近距离下穿施工对既有地铁车站及高架桩基的影响。［方法］以合肥S1线五里墩站安全线隧道施工近距离下穿既有地铁2号线五里墩站为背景，利用有限元软件ABAQUS对项目施工全过程进行三维建模，对比分析了逐线开挖和两线同时开挖两种方案下车站结构和高架桩基的变形。为考察类似工程在不同土体条件下的适用性，通过改变隧道处土体黏聚力和弹性模量两参数，分析了两参数在隧道开挖过程中对土体以及车站底板沉降的影响。［结果及结论］隧道开挖完成后，2号线五里墩站底板在两种方案下的最大沉降相近，分别为0.73mm和0.77mm，均满足控制标准要求；当土体的黏聚力和弹性模量分别小于70kPa和100MPa时，隧道开挖过程中车站结构的沉降和桩基的水平位移开始显著增大，应对此引起重视。
Abstracts:
［Objective］ Influence of metro tunnel closely under-passing the existing metro station and viaduct pile foundation is studied. ［Method］ Wulidun Station safety line tunnel on Hefei S1 Line closely under-passes the existing Wulidun Station on Metro Line 2. With this project as the background, the finite element software ABAQUS is used to build a three-dimensional model of the whole construction process, and the deformations of station structure and viaduct pile foundation under line by line excavation and simultaneous excavation of the above two lines are compared and analyzed. In order to investigate the applicability of similar engineering under different soil conditions, by changing the two parameters of soil cohesion and elastic modulus, the influence of the two parameters on the settlement of soil and station bottom plate during tunnel excavation are analyzed. ［Result & Conclusion］ After the completion of the tunnel excavation, the maximum settlements of the bottom plate of Metro Line 2 Wulidun Station under the two schemes are very similar being 0.73 mm and 0.77 mm, both meeting the requirements of the control standard. When the soil cohesion and elastic modulus are less than 70 kPa and 100 MPa respectively, the settlement of the station structure and the horizontal displacement of the pile foundation during tunnel excavation begin to increase significantly, which should be treated seriously.
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