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.
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 Dongwei1,CAO Yanmei2,CHEN Bin1. Effect of the randomness of soil parameters on the transmission of ground vibration near high-speed railway. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(14): 121-126.
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