Study On Environmental Vibration Induced By Highway Traffic

With the rapid development of transport and the bigger size of cities, the vibration caused by road traffic load on the surrounding environment is increasingly prominent. The study on ground vibration under traffic loads has been not long in domestic and mainly measured by tests, the mechanism and propagation in depth have not been clear. So whether the choice of transport vehicles loads close to the real situation may have a significant impact on the analysis of the accuracy of the calculation results. Thus if we could establish the mathematical model of random traffic simulation according to the flow parameters of traffic load's the statistical law and the distribution characteristics and achieve a realistic simulation of road traffic load, which not only can make the calculation results more close to the engineering practice, but also improve the accuracy of calculation, and then make better practice guidance in engineering by the conclusion of the study. Therefore, the research will be of great significance. In order to meet the current situation and the need for further research, and learn from the research results at home and abroad, by using the method of combining theory and experiment, I obtain the main contents of this article and innovations as follows:Firstly, simulate random traffic load. Summarize the characteristics of traffic load, the main factors of vehicle mobile load, and traffic loads of classic forms of expression; derive vehicles additional dynamic loads caused by uneven pavement according to assuming that the road is not smooth sine function, as well as simplifying the car for the two degree of freedom vibration system, and analyze its impact factors; summarize a suitable cycle characteristics which not only can reflect small and smooth geometry similar exciting forms of force but also approximate the simulated car load and can reflect the impact of vehicle speed, and can be expressed clearly; establish a mathematical model of the random flow simulation to achieve a realistic simulation of road traffic load, according to two pieces of information:the vehicle information and traffic flow information, including models, vehicle weight, axle load, speed, vehicle lateral driving position, the car away from the vehicle spacing and other parameters, and consider the stochastic nature and distribution law of these parameters.Secondly, ground vibration tests induced by road traffic. Analyze the ground vibration state of the points due to road traffic loads near the road which is located between Beijing new highway interchange and Beiqinglu which is located between North Fifth and North Sixth Ring, and study the attenuation law of ground vibration with distance induced by highway traffic; measure the soil modulus of elasticity parameters by wave velocity tests in accordance with the relationship of the wave propagation velocity in the soil and soil characteristicsThirdly, simulate the ground vibration caused by the traffic load by numerical. Write a road the randomly traffic simulation program according to the actual statistical analysis of Beiqinglu traffic load and statistical regularities and distribution characteristics of the traffic load's each parameter, establish a mathematical model of the random flow simulation, and thus produce more accurate and comprehensive simulation of random traffic to achieve a realistic simulation of road traffic load; simulate the surrounding vibration caused by traffic loads by using ANSYS to build the road and the soil model and verify the feasibility of the model by measuring results with the tests,...