建筑物对地铁引发场地振动影响的实测分析  

IN-SITU MEASUREMENT AND ANALYSIS OF THE INFLUENCE OF A BUILDING ON GROUND VIBRATION INDUCED BY METRO

作　　者：宗刚[1,2] 郑玉琴 任晓崧[1] 张永红[1] ZONG Gang;ZHENG Yu-qin;REN Xiao-song;ZHANG Yong-hong(Research Institute of Structural Engineering and Disaster Reduction in College of Civil Engineering Shanghai 200092,China;State Key Laboratory of Disaster Reduction Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院结构工程与防灾研究所,上海200092 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《工程力学》2018年第A01期287-292,共6页Engineering Mechanics

基　　金：国家科技支撑计划课题项目(2015BAK17B04)

摘　　要：选取上海某地铁沿线工程建设场地,先后开展了建设前自由场和建设后建筑—场地的振动实测,通过实测数据的时域、频域分析,对比研究了建筑物对场地振动的影响规律。结果表明:建筑物的质量对振动响应的影响较小,而地下室结构的墙、板构件对场地内传播的弹性波有显著的反射、阻隔作用。波的反射效应在地下室与轨线间局部区域形成能量聚焦区,导致地表振动响应放大,最高的放大率超过1倍以上;波的阻隔作用使地下室内形成振动能量的屏蔽区,振动响应减小,减小率超过45%。A construction field nearby a metro line was selected for vibration measurement. In situ measurements for free field vibration and building-field vibration were performed before and after the construction. The influence of the building on the ground vibration were studied by data analysis. The results show that the influence of the building＇s mass is weak on the ground vibration, while the reflection and obstruction of the walls and baseboard in the basement is prominent. The energy focus region is made by the wave reflection on the basement wall, so the ground vibration is amplified in some local region. The maximum amplification ratio is more than 100%. The energy shielding zone is made in the basement by the obstruction of the wall and baseboard and the vibration is reduced obviously. The minimum reduction ratio is still more than 45%.

关 键 词：地铁振动 振动实测 建筑影响 减振效应 波阻抗 

分 类 号：U211.3[交通运输工程—道路与铁道工程]