盾构下穿时既有国铁站房的受力分析及加固方案
雷崇刁维科
Stress Analysis and Reinforcement Scheme of Shield Tunnel Under-passing Existing National Railway Station Building
LEI ChongDIAO Weike
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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.2022.09.017
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中图分类号/CLCN:U291.6+3
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栏目/Col:研究报告
摘要:
合肥轨道交通1号线三期瑶海公园站—合肥站区间隧道正下穿未预留条件且经过两次改造的合肥站站房。为保证盾构顺利下穿，采用数值模拟计算，分别分析了站房基础存在既有沉降、站房无加固时由盾构下穿引起的站房基础沉降及站房上部结构内力变化、不同站房加固方案对应的结构内力变化等问题。研究结果表明：针对不同地层损失率，在站房无加固条件下，盾构隧道下穿会导致站房部分结构承载力不足；提出新增桩基+预应力梁的加固方案，经验算后证实变形及结构内力能满足要求。
Abstracts:
The tunnel of Yaohai Park Station\|Hefei Station interval of Hefei Rail Transit Line 1 under-passes Hefei Station building that has been reconstructed twice without reserved condition. To ensure successful under-passing of shield tunnel, numerical simulation is used to analyze problems including the existing settlement of the station building foundation, the settlement of the station building foundation caused by shield structure under-passing without building reinforcement, and the internal force change of building upper structure, structural internal force changes correspondent to different station building reinforcement schemes. Research results show that according to different stratum loss rates, under the condition of station building without reinforcement, the under-passing of shield tunnel will lead to insufficient bearing capacity of part of station building structure. Reinforcement scheme of new pile foundations + prestressed beams is proposed, and the deformation and structure internal force are verified to meet the requirements after verification calculation.reinforcement of station building; stress analysis
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