地铁车站软土地基变形计算及处理方法*
李智
Deformation Calculation and Treatment of Metro Station Soft Foundation
LI Zhi
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作者信息:广州地铁设计研究院股份有限公司，510010，广州
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Affiliation:Guangzhou Metro Design & 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.2019.05.024
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中图分类号/CLCN:TU433
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栏目/Col:研究报告
摘要:
为掌握不同厚度软土地基车站加固前的变形特性，为软土地基加固提供理论支撑，利用回弹再压缩方法对基底变形进行了精确计算，并对桩基+牛腿+三轴搅拌桩抽条、桩基+三轴搅拌桩抽条、三轴搅拌桩裙边+抽条以及桩基+三轴搅拌桩裙边+抽条等4个加固方案进行了技术经济对比。分析结果表明，当基底以下存在软土时，按回弹再压缩方法计算的变形约为基底软土厚度的0.015倍，需加固至较好地层;基底加固亦可有效减小基坑开挖变形及内力;综合考虑造价及加固效果，采用桩基+牛腿+三轴搅拌桩抽条方案较优。此方案已在佛山地铁3号线大墩站一期工程中成功应用。
Abstracts:
In order to master the deformation characteristics of different soft foundation stations before reinforcement, so as provide a theoretical support for soft foundation reinforcement, the rebound recompression method is used to accurately calculate the base deformation, at the same time, four reinforcement schemes are compared from technical and economic perspectives, including pile foundation + bracket + three-axis mixing pile pumping, pile foundation + three-axis mixing pile pumping, three-axis mixing pile +sprout and pile foundation + three-axis mixing pile skirt + sprout. The analysis results show that when the soft soil is under the basement, the deformation calculated by the rebound recompression method is about 0.015 times the thickness of the soft soil, then the soil needs to be strengthened to a better formation, because the base reinforcement can effectively reduce the excavation deformation and internal force of the foundation pit. Based on a comprehensive consideration of the cost and reinforcement effect, the scheme of pile foundation + bracket + three-axis mixing pile is recommended, which has been successfully applied in the first phase of Dadun Station project on metro Line 3 in Foshan City.
引文 / Ref:
李智.地铁车站软土地基变形计算及处理方法[J].城市轨道交通研究，2019，22(05):111.
LI Zhi.Deformation Calculation and Treatment of Metro Station Soft Foundation[J].Urban Mass Transit，2019，22(05)：111.
LI Zhi.Deformation Calculation and Treatment of Metro Station Soft Foundation[J].Urban Mass Transit，2019，22(05)：111.
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