摘要
为了研究地铁列车引起的地面振动,将轨道、隧道结构和列车荷载简化后建立三维有限元动力分析模型.列车按8节车辆编组,以80 km/h的速度运行.计算了列车引起的地面振动,以分析隧道地基弹性模量和隧道埋深对地面振动响应的影响.结果表明:列车通过时,地面的竖向振动普遍比横向振动大;在靠近线路中心的区域,竖向振动随到线路距离的增加很快衰减;地面的横向振动有时比竖向的大,计算时不应忽略;地面振动强度和传播范围随地基弹性模量和埋深增加而减小.
To study ground vibrations caused by metro trains, a three-dimensional dynamic finite element model was derived with simplifications in tracks, tunnels and loads caused by a running train. A train was composed of 8 cars, and its speed was 80 km/h. The ground vibrations were calculated to analyze the influences of elastic modulus of soils and the burial depth of tunnels. Results show that vertical ground vibrations are generally greater than the lateral vibrations in the area vicinity to the central line of the railway, and decrease rapidly with an increase in the distance to the central line. However lateral vibrations of ground may be greater than vertical vibrations, so they should not be neglected in calculation. Ground vibrations decrease as the soil elastic modulus and the burial depth of tunnels increase.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2008年第2期218-221,247,共5页
Journal of Southwest Jiaotong University
基金
四川省青年科技基金项目(07ZQ026-119)
教育部创新团队计划项目(IRT0452)
关键词
地铁
有限元法
埋深
地面振动
subway
FEM
burial depth
ground vibration
