典型地屏障对铁路线路减振效果分析-道路与铁道工程专业论文.docxVIP

Abstract Abstract II II ANALYSIS OF VIBRATION REDUCTION EFFECT FOR RAILWAYS WITH TYPICAL BARRIERS ABSTRACT With the rapid development of high-speed train and dedicated passenger line, the capacity and efficiency of train transportation increase greatly. But on the other hand, high-speed trains cause more severely dynamical response and the problems of vibration and noise are becoming more and more prominent. When the level of noise and vibration reach some extent, it will bring negative disturbing problems of noise and vibration for the people along the track line. So the importance of studying on the environmental vibration problems caused by high-speed train and controlling measures is immense. The typical vibration isolation barriers are used for reducing vibration propagating energy. This vibration attenuation method is more effective and is paid is paid more and more attention. In order to propose feasible vibration reduction and isolation measures, in this paper the producing mechanism and propagating discipline of vibration due to high-speed train crossing were analyzed. At the same time, the vibration wave and factors were studied. In this model, regarding the vehicle as moving load, the vibration actions caused by moving loads are transmitted to the ground and nearby regions. Thus it will lead to a series of environmental problems. Based on the above analysis, the main content of research is organized as follow: Combining the field test of environmental vibration, the propagating discipline of ground-borne vibration induced by high-speed railway was analyzed. The analyzed results show that the ground-borne vibration due to high-speed train belongs to middle or low frequent vibration. And the horizontal vibration and the vertical vibration are the same order of magnitude. And the vibration level will decrease with the distance away from centerline. Using the Fourier transform method, the three-layer beam model of track structure under vehicle dynamical load