地铁车站基坑下穿对既有桥梁变形的影响及其控制措施研究
何晟亚1刘一2李恒一1王志杰3
Research on Deformation Influence and Control Measures of Metro Station Foundation Pit Under-crossing Existing Bridge
HE ShengyaLIU YiLI HengyiWANG Zhijie
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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.中国港湾工程有限责任公司， 100027， 北京；
3.西南交通大学交通隧道工程教育部重点实验室， 610031， 成都
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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.2022.06.021
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中图分类号/CLCN:U445.7+1
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栏目/Col:研究报告
摘要:
以深圳地铁12号线和平站基坑下穿穗莞深城际轨道某特大桥区段为例，探究不同的基坑降水形式和钢支撑体系布置对桥墩变形的影响，提出桥墩保护控制措施，并通过现场监测进行验证。结果表明：地连墙混凝土弹性模量的增大对桥墩变形的控制效果有限，通过增大混凝土弹性模量来控制桥墩变形是不经济的；基坑降水增大了桥墩的最大竖向位移，但减小了其最大水平位移；钢支撑道数的减少明显增大了桥墩变形，同时减少第2、第4道支撑，30#桥墩的最大水平位移增大56.91%，31#桥墩的最大水平位移增大36.53%；单独采用隔离桩或旋喷桩加固措施不能满足桥墩变形要求。现场监测和数值模拟结果表明，采用隔离桩和旋喷桩的加固措施是有效的。
Abstracts:
Taking Shenzhen Metro Line 12 Heping Station foundation pit under-crossing Guangzhou-Shenzhen Intercity Railway certain mega bridge section as an example, the influence of different foundation pit dewatering forms and steel support system layout on the deformation of bridge piers is explored. Protection and control measures for bridge piers are proposed and are verified with field monitoring data. Results show that: the increase of diaphragm wall concrete elastic modulus has limited control effect on the deformation of bridge pier, and it is uneconomical to control in this way. Foundation pit dewatering increases the vertical maximum displacement of the pier but decreases the horizontal maximum displacement. Reducing the number of steel supports significantly increases bridge pier deformation, while reducing the second and fourth supports increases the maximum horizontal displacement of bridge pier No. 30 by 56.91% and pier No. 31 by 36.53%. Adopting reinforcement measures of isolated pile or rotary jet grouting pile alone doesn′t guarantee the deformation requirements of bridge piers. Field monitoring and numerical simulation results show that the joint reinforcement measure of isolated pile and rotary jet grouting pile proposed by the project is effective.
引文 / Ref:
何晟亚, 刘一, 李恒一, 等. 地铁车站基坑下穿对既有桥梁变形的影响及其控制措施研究. 城市轨道交通研究, 2022, 25(6): 105.
HE Shengya, LIU Yi, LI Hengyi, et al. Research on deformation influence and control measures of metro station foundation pit under-crossing existing bridge. Urban Mass Transit, 2022, 25(6): 105.
HE Shengya, LIU Yi, LI Hengyi, et al. Research on deformation influence and control measures of metro station foundation pit under-crossing existing bridge. Urban Mass Transit, 2022, 25(6): 105.
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