地铁基坑下穿铁路桥的桥墩保护设计方案合理性研究
李恒一1王志杰2何晟亚1王如磊2徐海岩3,4
Rationality Study on Pier Protection and Design Scheme of Metro Foundation Pit Under-crossing Railway Bridge
LI HengyiWANG ZhijieHE ShengyaWANG RuleiXU Haiyan
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作者信息:1.广州地铁设计研究院股份有限公司, 510010, 广州;
2.西南交通大学交通隧道工程教育部重点实验室, 610031, 成都;
3.四川农业大学土木工程学院, 611830, 都江堰;
4.四川农业大学村镇建设防灾减灾四川省高等学校工程研究中心,
5.611830, 都江堰
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Affiliation:Guangzhou Metro Design and Research Institute Co., Ltd., 510010, Guangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.07.037
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中图分类号/CLCN:U455.45+2
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栏目/Col:施工技术
摘要:
以深圳地铁12号线和平站下穿穗莞深城际铁路特大桥工程为依托,通过数值模拟和理论分析,对地铁基坑下穿段实施的桥墩保护措施的合理性展开了深入研究。研究结果发现:针对桥墩水平位移,若仅采用隔离桩和采用土体加固两个措施,对两侧桥墩产生的影响差别较小;设置隔离桩可有效控制桥墩的竖向位移;在地下连续墙能保证基坑稳定的前提下,改变其墙厚和嵌固深度,对桥墩位移的变化影响较小;分区开挖可有效控制基坑变形及临近桥梁区域土体的变形。
Abstracts:
Based on the project of Shenzhen Metro Line 12 Heping Station under-crossing Guangzhou-Shenzhen Intercity Railway mega bridge, in-depth research and analysis on the rationality of bridge protection measures adopted in the metro foundation pit under-crossing section is carried out through numerical simulation and theoretical analysis. Research results show that: in terms of bridge pier horizontal displacement, adopting only isolation piles or only soil reinforcement causes slightly different effects on bridge pier on both sides; adopting isolation pile can effectively control the vertical displacement of bridge pier; when the diaphragm wall can ensure the stability of foundation pit, changing wall thickness and embedded depth has limited effect on bridge pier displacement; divisional excavation can effectively control the deformation of foundation pit and the deformation of soil in adjacent bridge area.
引文 / Ref:
李恒一,王志杰,何晟亚,等.地铁基坑下穿铁路桥的桥墩保护设计方案合理性研究[J].城市轨道交通研究,2022,25(7):180.
LI Hengyi,WANG Zhijie,HE Shengya,et al.Rationality Study on Pier Protection and Design Scheme of Metro Foundation Pit Under-crossing Railway Bridge[J].Urban mass transit,2022,25(7):180.
LI Hengyi,WANG Zhijie,HE Shengya,et al.Rationality Study on Pier Protection and Design Scheme of Metro Foundation Pit Under-crossing Railway Bridge[J].Urban mass transit,2022,25(7):180.
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