地铁运行区域某建筑物施工前后楼地面振动实测与分析  

Measurement and Analysis of Metro-induced Floor and Ground Vibration of a Building before and after Construction in Existing Metro Operation Area

作　　者：钟才敏[1,2] 傅晋申[3] 汪凯[3] 吉欣 

机构地区：[1]同济大学建筑工程系,上海200092 [2]中国建筑设计研究院上海中森建筑与工程设计顾问有限公司,上海200062 [3]华东建筑设计研究院有限公司,上海200002 [4]上海建工一建集团有限公司,上海200120

出　　处：《防灾减灾工程学报》2015年第6期738-744,共7页Journal of Disaster Prevention and Mitigation Engineering

摘　　要：以某新建建筑为例,对既有地铁运行区域新建建筑施工之前的自由场地以及建筑物建成后楼地面的振动加速度进行实测。分别从加速度有效值和加速度级等方面对地铁运行引起的地面振动规律进行分析;同时,采用傅里叶谱以及1/3倍频程谱来分析振动的频率特性。结果表明:自由场地的振动在衰减过程中有时会出现局部回升区域;建筑施工前的自由场地振动强度略高于建筑完成后的一层楼面,将自由场地的测试结果作为激励输入新建建筑基底,用以预测建筑物的上部结构响应是可行的;开挖后基坑底的振动要远小于自由场地的振动。Taking a newly bulit buliding in existing metro operation area as an example,the freefield′s acceleration before construction of the building and the free-field and floor′s accelerations after construction of the buliding were measured.The rule of ground vibration caused by metro running was analyzed in respect of effective value and level of the acceleration.At the same time,fourier spectrum and one-third octave spectrum were used to analyze the frequency characteristic of vibration.The results show that sometimes,there exists a local rebound region of the metroinduced vibration in free-field.The vibration intensity in free-field is slightly larger than that of the first floor of the buildings and the acceleration measured in the free-field can be used as an excitation to calculate the response of the proposed buildings.It is also found the ground vibration in the foundation pit is far less than that of free-field.

关 键 词：地铁振动 现场测试 加速度有效值 加速度级 

分 类 号：TU921[建筑科学—建筑设计及理论] X593[环境科学与工程—环境工程]