摘要
以城市轨道交通一座车站近临既有市政高架桥施工为背景,利用Plaxis有限元分析软件对桥梁墩台的沉降和变形进行数值分析。并根据实际监控量测结果反馈桥梁墩台沉降和变形。研究结果表明:地铁车站施工期间,既有市政高架桥变形主要为桥梁墩台沉降,沉降随基坑开挖深度增加而逐渐加大,但是基坑开挖到底板施工完毕,降水达到稳定水位时,沉降趋于稳定。桥梁墩台的沉降量远小于地面沉降量。桥梁墩台的倾斜变形和差异沉降引起桥面的转角远小于相应规范的控制要求。
In relation to the construction of an urban rail transit stationnear an existing municipal viaduct,the Plaxis finite element analysis softwareis utilized to conduct a numerical analysis of the settlement and deformationof a bridge pier.Feedback on the settlement and deformation ofthe bridge pier and ground settlement was provided according to actualmonitoring and measurement results.The findings indicate that during subwaystation construction,the deformation of the existing municipal viaduct isprimarily attributed to bridge pier settlement,which gradually increases withdeeper excavation of the foundation pit but tends towards stability onceexcavation reaches a stable water level.Bridge pier settlement is significantlyless than ground settlement.Inclined deformation and differential settlementof the bridge pier result in an angle for the bridge deck that falls well belowcorresponding code requirements.It can be concluded that protective measuresfor bridge pile in subway station foundation pit construction are effective andsafe.
作者
徐振艳
Xu Zhenyan(China Railway Design Group Co.,Ltd.,Tianjin 300042,China)
出处
《山西建筑》
2024年第21期118-122,共5页
Shanxi Architecture
关键词
基坑施工
桥梁墩台
数值分析
倾斜变形
差异沉降
地面沉降
foundation pit construction
bridge pier
numerical analysis
inclined deformation
differential settlement
land subsidence
