土层参数随机性对高速铁路周围场地土振动传递的影响

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (14) : 121-126.

论文

李东伟1，曹艳梅2，陈斌1

作者信息 +

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

LI Dongwei1，CAO Yanmei2，CHEN Bin1

Author information +

文章历史 +

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，本文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。
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

Abstract

In order to explore the influence of the random distribution of site soil parameters on the transmission of site soil vibration around high-speed railway, this paper considers three random distributions of site soil parameters under the shear wave velocity of soil layer, material damping ratio and both double random variables. Based on the Toro statistical model, the Monte Carlo method is used to simulate 200 sets of working conditions respectively and input the 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 passes by. The random vibration response of 1/3 octave vibration level, Z vibration level and its 95% confidence interval are compared with the vibration response 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 analysis of the random distribution of soil parameters is carried out using the standard deviation of random vibration response. The results of the study show that: the randomness of soil parameters has a great influence on the vibration transmission of the site 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 1/3 vibration level, and the single random variable of material damping ratio has a small influence on the low frequency and a large influence on the high frequency of site soil vibration response. It is suggested to consider the influence of the random distribution of soil parameters when assessing and predicting the vibration of the railway traffic environment.
Keywords: Random distribution of soil layer parameters; train-track-subsoil coupling model; 1/3 octave vibration level; Z vibration level; Site soil vibration transmission.

导出引用

李东伟1，曹艳梅2，陈斌1. 土层参数随机性对高速铁路周围场地土振动传递的影响[J]. 振动与冲击, 2022, 41(14): 121-126

LI Dongwei1，CAO Yanmei2，CHEN Bin1. Effect of the randomness of soil parameters on the transmission of ground vibration near high-speed railway[J]. Journal of Vibration and Shock, 2022, 41(14): 121-126

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