Prediction Of Railway Induced Ground And Building Vibration Using Hybrid Method

The rapid development of China's rail transit has brought great convenience to the emergence of people and provided impetus for regional economic development,but it has also caused inevitable environmental problems.The vibration propagation of the ground train will cause the vibration of the ground and adjacent buildings.Based on the problem caused by rail transit,this paper uses a hybrid prediction method combining numerical method and experimental measurements to predict the vibration response.The main research contents are:(1)Through the on-site hammering test,the propagation characteristics of vibration in soil are studied.The test results show that the transfer function of vibration in soil has nothing to do with the frequency spectrum characteristics of the hammering excitation load.And an open field along the railway line and the adjacent 5-story masonry structure buildings were field tested.After obtaining the transfer function,the transfer function was used to predict the vibration response of the ground and the building.(2)Using the ABAQUS software,a three-dimensional finite-infinite element coupling model of train-track-foundation soil is established to explore the effect of train speed on the transmissibility.First,the calculation results are compared with the existing conclusions to verify the rationality and effectiveness of the model.Second,analyzing the calculated data to obtain the transmissibility.The results show that the speed of the train has little effect on the amplitude of the vibration transfer function.(3)Applying the multi-point hammering load excitation method to obtain the transmission characteristics of the vibration in the soil,which can be used as the vibration transmission characteristics of the train during operation.The finite-infinite element coupling model was established,to analyze the amount and spacing of the load and the effect of the position of action on the transmissibility.