地铁列车荷载计算方法对盾构隧道动力响应的影响  

Influence of Metro Train Loading Calculation Methods on Dynamic Responses of Shield Tunnel

作　　者：李磊[1,2] 张孟喜[1] 吴惠明 

机构地区：[1]上海大学土木工程系,上海200072 [2]上海隧道工程有限公司,上海200032

出　　处：《上海交通大学学报》2015年第7期1030-1034,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(41172238)

摘　　要：采用地铁列车移动轮载、激振力函数法和数定分析法计算得到上海地铁列车荷载时程,考虑管片-土体及管片间的接触特性和纵向螺栓的连接作用,建立道床-管片-土体系统的三维动力有限元模型,分析比较了3种计算方法所得隧道结构动力响应的差异.研究表明:3种方法所得道床和土体单元动应力以及道床点位移时程曲线基本一致;基于实测数据的数定分析法适用于地铁列车荷载引起的环境振动评价,移动轮载和激振力函数法均会导致加速度频谱分布产生误差.Moving axle loads, excitation force function and deterministic formulas for vibration acceleration of track were employed to calculate the metro train load time-history in Shanghai. Considering the interface characteristics between the segments and the surrounding soils as well as other segments and the effect of longitudinal joint bolts, a three-dimensional dynamic finite element model of track bed-segment-soil system was constructed to compare the dynamic responses on shield tunnel structures. The results show that dy- namic stresses time-history curves of track bed and soil elements are basically the same for the three meth- ods. Due to the differences of acceleration frequency spectrum caused by moving axle loads and excitation force function methods, the evaluation of metro-induced environmental vibrations should be based on the measured data of metro train loading.

关 键 词：地铁列车荷载 盾构隧道 三维有限元法 动力响应 加速度频谱 

分 类 号：U451[建筑科学—桥梁与隧道工程]