地铁运行引起场地振动的荷载与分析方法  

LOAD FOR SUBWAY-INDUCED FREE FIELD VIBRATION AND ANALYSIS METHOD

作　　者：王田友[1] 丁洁民[1] 楼梦麟[2] 

机构地区：[1]同济大学建筑设计研究院,上海200092 [2]同济大学土木工程系,上海200092

出　　处：《工程力学》2010年第1期195-201,共7页Engineering Mechanics

摘　　要：利用实测钢轨加速度时程,建立地铁列车二系弹簧模型,考虑轮轨非线性接触及轨道不平顺,求得了钢轨荷载时程。分别由钢轨荷载时程求得了简单模型的隧道仰拱荷载时程和由列车轮载求得了纵向钢轨-隧道-地基模型的仰拱轮载时程,为地铁环境振动分析提供了基本数据。在此基础上,进行地铁所致环境振动的二维和三维模型的计算比较,考虑了粘弹性和粘性人工边界的不同影响。对比得出了二维模型地铁环境振动分析的适用计算方法和隧道荷载以及三维模型的适用隧道荷载。还比较了三维模型环境振动分析采用不同人工边界的影响。最后,利用隧道仰拱荷载施加于二维模型分析了地面振动的衰减规律,并与实测数据进行了比较,结果符合较好。Utilizing measured acceleration data on rail, the load series on rail is obtained by a two-system model of subway train, considering rail-wheel Hertz contact and track irregularity. With the load series on rail and a simple model, a load series on tunnel invert is obtained. Meanwhile, a load series on tunnel invert is obtained by a longitudinal rail-tunnel-soil model and a wheel load series. These are the basic data for the analysis of subway-induced environmental vibrations. Then, the subway-induced environmental vibration is compared on two/three dimension models, considering the different influence of viscoelastic and viscous artificial boundaries. The proper two dimension model method and available tunnel load for subway-induced environmental vibration analysis are discussed. In addition, the applicable tunnel load for three dimension model is obtained. Finally, using a two dimension model and the tunnel invert load, the attenuation law on soil surface is analyzed and agrees well with measured data.

关 键 词：地铁 环境振动 Z振级 荷载 轨道不平顺 人工边界 三维 

分 类 号：TU435[建筑科学—岩土工程]