地铁振动数值模拟中土层范围探讨  

Research on the scope of soil layer in the numerical simulation of subway induced vibration

作　　者：张遥奇 陈红江 伍丽红 ZHANG Yaoqi;CHEN Hongjiang;WU Lihong(Hunan Institute of Metrology and Test,Changsha 410014,China;Changsha Rail Transit Operation Co.,Ltd.,Changsha 410014,China)

机构地区：[1]湖南省计量检测研究院,湖南长沙410014 [2]长沙市轨道交通运营有限公司,湖南长沙410014

出　　处：《中国计量大学学报》2019年第4期395-399,共5页Journal of China University of Metrology

基　　金：国家重点研发计划项目(No.2017YFF0205003);湖南省科技创新计划项目(No.2018XK2008)

摘　　要：目的:探讨在地铁振动数值计算分析中,根据输入荷载频率确定合理的模型竖向尺寸,为有限元计算中模型尺寸的确定提供依据。方法:采用平面应变假定,应用频域分析方法借助有限元程序ANSYS对地铁振动反应进行计算,通过比较不同频率的简谐激励下的计算结果,分析了地表谐响应的水平分布规律。结果:实测数据表明,地铁振动主要以40~90 Hz为主。数值仿真结果表明:在长沙地区,竖向深度取为50 m,可以满足计算精度要求。结论:对于频率范围在20 Hz至40 Hz之间荷载作用时,建议计算深度取100 m。Aims: This paper aims to discuss the determination of an appropriate model size in consideration of the excitation with different frequencies in the numerical analysis of subway-induced vibration and to determinate the model size in the computing with the finite element method. Methods: Based on the assumption of plane strain, the response of subway-induced vibration was analyzed by using the FEM software ANSYS with the method of frequency domain. By comparing the response to harmonic excitation with different frequencies, the distribution of ground motion was studied. Results: The measured data showed that the subway vibration was mainly 40~90 Hz. The numerical simulation results showed that the vertical depth was 50 meters in Changsha area, which could satisfy the calculation precision. Conclusions: When the frequency range is between 20 Hz and 40 Hz, the recommended calculation depth is 100 meters.

关 键 词：计量 平面应变问题 谐响应 地铁振动 

分 类 号：TB936[一般工业技术—计量学]