地铁诱发的砖混结构环境振动及传递规律研究  

Environmental Vibration and Propagation Laws of Brick-Concrete Structures Induced by Subways

作　　者：王振刚[1] WANG Zhengang(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《都市快轨交通》2024年第4期80-87,共8页Urban Rapid Rail Transit

基　　金：中国铁建股份有限公司科技研发计划项目(2022-A02)。

摘　　要：为解决地铁运行引起的邻近砖混结构环境振动问题,以某7层砖混结构为研究对象,实测隧道内、室外地面、结构楼板的振动响应,分析振动沿“隧道-地面-结构”的传递规律,并由此提出建筑物内环境振动超标可能的原因:隧道埋深浅、建筑与隧道距离近且处于同个土层使得土体对振动的衰减效果较差;结构部分楼板共振导致振动响应超过评价规定的室外地面和室内首层。进一步建立该砖混结构的有限元模型,采用实测柱底竖向加速度作为荷载,并对比实测楼板响应验证模型的准确性。模拟计算结果证实中间层及顶层楼板的放大效应,并通过分析获得了楼层数量、层高、板厚、墙厚参数对振动响应空间分布的影响。研究成果对砖混结构的环境振动评价具有一定参考价值。This study addresses the environmental vibration issues of adjacent brick-concrete structures induced by subway operations,focusing on a 7-story brick-concrete building as the primary investigation subject.Vibrations were measured at the tunnel,outdoor ground level,and various structural floors to analyze the propagation characteristics along the“tunnel-groundstructure”path.The study aims to identify reasons for vibration levels exceeding standards.Key factors contributing to the issue include the shallow depth of tunnel burial,the proximity of buildings to the tunnel,and their shared soil layer,resulting in inadequate vibration attenuation through the soil.Additionally,resonance effects within specific floor slabs of the structure contribute to vibration responses surpassing evaluation standards outdoors and on the first indoor floor.A finite element model of the brick-concrete structure was constructed using measured vertical accelerations at column bases as loads.The model’s accuracy was validated against measured floor responses,confirming amplification effects on middle and upper floors.Parametric analysis explored the impacts of floor count,story height,slab thickness,and wall thickness on the spatial distribution of vibration responses.The findings from this study provide valuable insights for evaluating environmental vibrations in similar structures,offering guidance for mitigating effects and ensuring compliance with vibration standards.

关 键 词：地铁 环境振动 砖混结构 环境影响评价 数值模拟 

分 类 号：U231[交通运输工程—道路与铁道工程] TU311.3[建筑科学—结构工程]