新建航道基坑下穿高铁桥梁对邻近桥墩的影响分析
李晓龙
Influence Analysis of Newly-built Channel Foundation Pit Under-passing High-Speed Railway Bridge on Adjacent Piers
LI Xiaolong
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作者信息:上海东华地方铁路开发有限公司， 200071， 上海
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Affiliation:Shanghai Donghua Local Railway Development Co., Ltd.， 200071， Shanghai， China
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Key words:
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DOI:10.16037/j.1007-869x.2024.03.034
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中图分类号/CLCN:U443.22
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栏目/Col:研究报告
摘要:
［目的］新建航道基坑下穿高铁桥梁时，基坑开挖卸载会引起桥梁周边土体产生位移，进而影响高铁桥梁。为确保高铁线路的运营安全，需对新建航道基坑下穿高铁桥梁时对邻近桥墩的影响进行分析。［方法］以京杭大运河新建航道基坑下穿沪昆高铁工程为背景，基于有限元模拟和现场实测，分析了航道基坑施工对既有高铁桥墩的影响，评估了航道基坑工程采用多排钻孔桩+斜撑加固方案的可行性和效果。［结果及结论］航道基坑施工主要会引起高铁桥墩产生顺桥向的水平变形，建议采取措施适当增大顺桥向刚度；钻孔桩越靠近高铁桥墩，其水平位移越大，随着航道基坑的施工，钻孔桩水平位移呈现先增大后减小的趋势；采取多排钻孔桩+斜撑的加固方案后，桥墩变形小于相应规范规定的2 mm限值要求，满足列车安全运营的要求。
Abstracts:
［Objective］ When a new channel foundation pit under-passes a high-speed railway bridge, the excavation and unloading of the foundation pit will cause the displacement of the soil surrounding the bridge, and further affect the high-speed railway bridge. In order to ensure the operation safety of the high-speed railway line, it is necessary to analyze the influence of the foundation pit under-passing the bridge on the adjacent piers. ［Method］ With the project of the new channel foundation pit of Beijing-Hangzhou Grand Canal under-passing the Shanghai-Kunming High-speed Railway bridge as the background, based on finite element simulation and on-site measurement, the influence of foundation pit construction on the existing high-speed railway piers is analyzed. The feasibility and effect of the scheme adopting multiple rows of bored piles+inclined brace reinforcement for the foundation pit construction are evaluated. ［Result & Conclusion］ As the channel foundation pit construction causes horizontal displacement of the high-speed railway piers along the bridge, it is proposed to take proper measures to increase the stiffness along the bridge. The closer the bored pile is to the high-speed railway pier, the larger the horizontal displacement. With the construction of the channel foundation pit, the horizontal displacement of the bored pile shows the trend of increasing first and then decreasing. The displacement of piers under the reinforcement scheme of multiple rows of bored piles + inclined brace is less than the 2mm limit required by the relevant standard, meeting the requirements for train operation safety.
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