济南轨道交通1号线和2号线下穿高铁工程对邻近 桥梁变形和振动的影响
谭生永
Line 1 and Line 2 Under-passing High-speed Railway Engineering on Adjacent Bridge Deformation and Vibration
TAN Shengyong
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作者信息:中国铁路济南局集团有限公司，250100，济南
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Affiliation:China Railway Jinan Bureau Group Co., Ltd., 250100, Ji’nan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.05.012
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中图分类号/CLCN:TU433；U211.3
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栏目/Col:研究报告
摘要:
为探究盾构施工过程中高铁桥墩的变形特征，以济南轨道交通1号线和2号线4条隧道下穿京沪高铁同一跨桥梁工程为例，开展了现场墩顶位移监测试验，并对2号线地铁隧道盾构掘进施工过程中邻近高铁墩顶的位移数据进行了分析。通过有限元法研究了隔离桩、隧道位置和地铁列车运行等不同工况下,下穿邻近高铁桥梁承台的竖向振动位移、振动加速度及其最大值的分布规律。研究结果表明：隔离桩的施工满足相关规范对盾构隧道施工期高铁桥墩位移的要求；1号线和2号线左线列车运行引起的高铁承台竖向振动位移均较大，建议对其采取轨道减振措施；隧道距离隔离桩顶部或底部越近，隧道引起的高铁承台振动位移越大。
Abstracts:
To study the characteristics of high-speed railway bridge pier deformation that occurs in shield tunnel construction, taking the engineering of four tunnels on Ji’nan Rail Transit Line 1 and Line 2 under-passing a bridge with the same span of Beijing-Shanghai High-speed Railway as example, field monitoring test of pier top displacement is carried out and the displacement data of adjacent high-speed railway pier top during Line 2 metro tunnel shield excavation is analyzed. Under different working conditions of isolation pile, tunnel position and metro train operation, the distribution law of pile cap vertical vibration displacement, vibration acceleration and their maximum values of the under-passed adjacent high-speed railway bridge is studied through finite element method. Research results show that the construction of isolation piles could meet the requirements in relevant specifications for the displacement of high-speed railway pier in shield tunnel construction period; the vertical vibration displacement of high-speed railway pile cap caused by the left line train operation on Line 1 and Line 2 is large, it is recommended to take rail vibration reduction measures; the closer the tunnel is to the isolation pile top or bottom, the greater the high-speed railway pile cap vibration displacement will be induced by the tunnel.
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