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
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.
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