土层参数随机性对高速铁路周围场地土振动传递的影响  

Effect of the randomness of soil parameters on the transmission of ground vibration near high-speed railway

作　　者：李东伟 曹艳梅[2] 陈斌 LI Dongwei;CAO Yanmei;CHEN Bin(China Railway Bridge&Tunnel Technologies Co.,Ltd.,Nanjing 210061,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]中铁桥隧技术有限公司,南京210061 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《振动与冲击》2022年第14期121-126,共6页Journal of Vibration and Shock

摘　　要：为探究场地土层参数随机分布对高速铁路周围场地土振动传递的影响,分别考虑了土层剪切波速、材料阻尼比以及二者双随机变量下的3种场地土参数随机分布,并基于Toro统计模型采用Monte Carlo方法分别模拟200组工况,输入建立的高速列车-轨道-场地土耦合系统模型中计算高速列车经过时场地土表面的振动响应。并将随机振动响应1/3倍频程振级、Z振级及其95%置信水平的置信区间与确定性土参数的振动响应进行比较,探究土参数随机性对高速铁路周围场地土振动传递的影响,进而采用随机振动响应标准差进行土参数随机分布的敏感性分析。研究结果表明:土参数随机性对高速铁路周围场地土振动传递的影响较大,剪切波波速单随机变量对场地土振动响应各频带1/3振级均有较大影响,材料阻尼比单随机变量对场地土振动响应的低频影响较小,高频影响较大。铁路交通环境振动评估及预测时建议考虑土层参数随机分布对其产生的影响。In order to explore the influence of the random distributions of site soil parameters on the transmission of site soil vibration around high-speed railway,three kinds of random distributions of site soil parameters were considered,including the shear wave velocity of soil layer,material damping ratio and their double random variables.Based on the Toro statistical model,the Monte Carlo method was used to simulate 200 sets of working conditions,which were then input to an established high-speed train-track-site soil coupling system model to calculate the vibration response of the site soil surface when the high-speed train passeed by.The obtained random vibration responses at 1/3 octave vibration level,Z vibration level and its 95%confidence interval were compared with the vibration responses in the condition of deterministic soil parameters to investigate the influence of the randomness of soil parameters on the vibration transmission of the site soil around the high-speed railway,and then the sensitivity of the random distributions of soil parameters was analysed by using the standard deviations of random vibration responses.The results of the study show that:the randomness of soil parameters has a great influence on the vibration transmission of the site soil around the high-speed railway,and the single random variable of shear wave velocity has a large influence on the vibration response of site soil in each frequency band at 1/3 vibration level,and the single random variable of material damping ratio has a little influence on the low frequency and a great influence on the high frequency of site soil vibration responses.It is suggested to consider the influences of the random distributions of soil parameters when assessing and predicting the vibration of the railway traffic environment.

关 键 词：土层参数随机分布 列车-轨道-场地土耦合模型 1/3倍频程振级 Z振级 置信区间 场地土振动传递 

分 类 号：P315.9[天文地球—地震学]