1．School of Civil Engineering，Beijing Jiaotong University，Beijing 100044, China;2.Engineering research center of railway environmental vibration and noise,Ministry of Education,East China Jiaotong University, Nanchang, 330013, China
Abstract：The precision instruments which inside the plant along Longkou-Yantai railway as study object. In order to calculate the ground vibration response caused by freight train with different speeds, the track-bridge and pier-foundation-soil models are established by using finite element method. Then summarize the attenuation rule of vibration acceleration, velocity and displacement along the distance and analysis on the effect of railway environment vibration on precision instrument inside the plant. Research shows that: The train speed has a great influence on vibration response, the train speed more higher, the ground vibration response on the same location will be more greater; The attenuation characteristics of acceleration, velocity and displacement along the distance are substantially uniform, it performance for the exponential attenuation law; If not considering the precision instrument’s own isolation capability, two freight train with the speed of 120km/h and 100km/h meet near factory plant, the prediction values of acceleration, displacement and Y direction speed less than the vibration limit values, but the prediction values of the X and Z direction speed beyond the instrument’s vibration limit values; After considering the precision instrument’s own isolation capability, vibration prediction values can all meet the instrument’s vibration limit values.
2013, Vol. 32 
