宁波市轨道交通海晏北路换乘站 基坑支撑优化与分析
陈金铭1狄宏规2宣炜1梁浩毅2苏光北2
Optimization and Analysis of the Foundation Pit Support at Haiyan North Transfer Station of Ningbo Rail Transit
CHEN JinmingDI HongguiXUAN WeiLIANG HaoyiSU Guangbei
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作者信息:1.1. 宁波市轨道交通集团有限公司， 315012， 宁波；
2.2. 同济大学上海市轨道交通结构耐久性与系统安全重点实验室， 201804， 上海
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Affiliation:Ningbo Rail Transit Group Co., Ltd., 315012, Ningbo, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2021.03.006
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中图分类号/CLCN:TU94+2:U231.4
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栏目/Col:研究报告
摘要:
基于宁波市轨道交通海晏北路换乘站基坑实测数据对比，研究了液压伺服钢支撑与普通钢支撑的支撑效果。利用Plaxis 3D软件对第5道混凝土支撑替换为液压伺服钢支撑的设计方案进行了模拟分析。结果表明：相较于普通钢支撑段，相邻液压伺服钢支撑段围护结构的水平，变形小22%左右，液压伺服钢支撑的支撑效果优于普通钢支撑。通过发挥伺服系统低补偿的优势，将伺服支撑段的第5道混凝土撑替换为3000 kN或4000 kN轴力情况下的液压伺服钢支撑，均满足规范对变形的要求。采用伺服钢支撑代替第5道混凝土撑的方案具有可行性。
Abstracts:
According to a comparison based on measured foundation pit data at Haiyan North Road Station on Ningbo rail transit, the supporting effects of hydraulic servo steel support and ordinary steel support are studied. Then, Plaxis 3D software is used to conduct a numerical simulation of foundation pit excavation design scheme, which is to replace the fifth concrete support with hydraulic servo steel support. The monitoring data analysis shows that compared with the ordinary steel support section, the deformation displacement of the adjacent hydraulic servo steel support section is about 22% smaller than that of ordinary steel support, the effect of the hydraulic servo steel support is obviously better than ordinary steel support. By taking the advantages of the servo system low compensation, when the fifth concrete support of servo supporting section is replaced with hydraulic servo steel support under the condition of 3 000 kN or 4 000 kN axial force, both solutions can meet the deformation requirements allowed by the specification. Therefore, it has certain feasibility if the servo steel support is used to replace the fifth concrete support.
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