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临地铁隧道的深厚砂土地层基坑开挖变形分析

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南京某深基坑项目开挖深度为 11 m,临近已有的地铁区间,开挖深度范围内主要为粉细砂层,水量丰富,周边环境保护要求高.为分析基坑开挖变形及其对周边环境的影响,文章采用Midas三维有限元软件,模拟了基坑开挖全过程,分析了各工况下基坑的变形.计算结果表明,基坑变形在设计允许值范围内,地铁侧水平和竖向变形均较小,也在允许值范围内.施工全过程的监测数据表明,实测值在允许范围内,满足围护结构自身和地铁隧道的保护要求.支护方案的顺利实施为类似深厚砂土地层的设计和施工提供了有效参考.
Analysis on the Deformation of Foundation Pit Excavation in Deep Sandy Soil Stratum Adjacent to Subway Tunnel
The excavation depth of a deep foundation pit project in Nanjing is 11 m,which is close to the existing subway section.The excavation depth range is mainly silty fine sand layer,which is rich in water and has high requirements for surrounding environmental protection.In order to analyze the deformation of foundation pit excavation and its influence on the surrounding environment,this paper uses Midas 3D finite element software to simulate the whole process of foundation pit excavation and analyze the deformation of foundation pit under various working conditions.The calculation results show that the deformation of the foundation pit is within the allowable value of the design,and the horizontal and vertical deformation on the subway side is small and within the allowable value range.The monitoring data of the whole construction process show that the measured value is within the allowable range,which meets the protection requirements of the enclosure structure itself and the subway tunnel.The successful implementation of the supporting scheme provides an effective reference for the design and construction of similar deep sandy soil stratum.

deep sandy soil stratumdeep foundation pitadjacent to subway tunnel3D finite element analysis

杨波、余巍

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南京东大岩土工程勘察设计研究院有限公司,江苏 南京 210000

深厚砂土地层 深基坑 临地铁隧道 三维有限元分析

2024

工程技术研究
广州钢铁企业集团有限公司

工程技术研究

影响因子:0.081
ISSN:2096-2789
年,卷(期):2024.9(14)