地铁运行诱发的环境振动数值模拟与模型预测  

Numerical simulation and model prediction for environmental vibrations induced by metro operation

作　　者：张鹤年[1] 阳建强[1] 孙广俊[2] 肖军华[2] 

机构地区：[1]东南大学建筑学院,南京210096 [2]南京工业大学土木工程学院,南京210009

出　　处：《东南大学学报（自然科学版）》2012年第5期988-993,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51008158;51008257);江苏省自然科学基金资助项目(BK2009466);江苏省博士后基金资助项目(1101000115)

摘　　要：通过建立列车、轨道、隧道和地基土三维振动仿真模型,分析了列车速度、地基土特性和隧道埋深3个因素对地面环境振动的影响规律,并与部分实测值进行了比较.基于回归分析,提出了多因素影响下的地面环境振动简化预测模型.研究表明:建立的数值模拟方法和预测模型能够较真实地反映地铁运行引起的地面环境振动的实际情况;随着列车速度增加,地面竖向振动加速度增大,且距离地铁线路越远,速度的影响越显著;距离地铁线路越远、地基土的卓越周期越大或隧道埋深越深,地面竖向振动加速度均越小,且地基土的卓越周期越大,振动在地基中的衰减越快.In order to study the influence factors and metro operation, and to establish the prediction model laws of environmental vibrations induced by of environmental vibrations, the influence of train speed, soil properties and tunnel depth on metro-induced environmental vibrations were investi- gated through three-dimensional vibration simulation model of train, track, tunnel and foundation soil, and the numerical results were compared with part of the field measurement data. Furthermore, based on the regression analysis, a prediction model for metro-induced environmental vibration was presented. The study results show that, the established numerical simulation method and the obtained prediction model can properly reflect the actual metro-induced environmental vibration. The results also indicate that with increasing train speed, the vertical vibration acceleration on ground increases, and the farther the distance away from the metro line, the more pronounced the speed influences. Meanwhile, with increasing distance from metro lines, or increasing predominant period of soil foun- dation, or increasing tunnel depth, the vertical vibration acceleration on ground decreases, and the greater the predominant period of soil foundation, the faster the vibration attenuates.

关 键 词：地铁 环境振动 有限元 预测模型 

分 类 号：TU443[建筑科学—岩土工程]