Effect Probability of Randomness of Soil Parameters on Environmental Vibrations Induced by High-speed Railway

In order to investigate the effect of randomness of soil parameters on the environmental vibrations induced by high-speed railway, the Monte Carlo simulation was carried out to generate the posterior random distribution model of the shear modulus and material damping ratio of site soil, and then the train-track-site soil layer coupling model was established to calculate the random vibration response of the site ground induced by a running high-speed train. Based on probability analysis theory, the kernel density estimation method was used to deduce the probability density function of the ground random vibration response to further solve the two-sided confidence interval with 95% confidence level of Z-vibration level and the 1/3 octave weighted vibration level. The sensitivity of the influence of random soil parameters was explored. Furthermore, the method of using "environmental vibration threshold" and "distance transition zone" was put forward to evaluate and predict the environmental vibrations around the built and proposed buildings induced by the high-speed railway, which has high engineering value. The results show that the randomness of soil parameters cannot be ignored in the evaluation/prediction of traffic-induced environmental vibrations. The randomness of soil parameters shows obvious influence on those vibrations with high frequencies or in the far field. In the area far away from the vibration source, the randomness of the damping ratio of the site soil material has a greater impact on the environmental vibration than the randomness of the soil shear module. © 2022, Department of Journal of the China Railway Society. All right reserved.