Study On The Dynamic Response Of The Ming Great Wall Under The Vibration Of Ground Traffic

In recent years,the impact of increasing surface transportation on the surrounding buildings has been increasingly visible.The vehicle load is long-term and random,which influences the buildings around the road,especially the ancient buildings,which is also long-term and significant.The Great Wall of the Ming Dynasty is an outstanding example of rammed earth architecture in ancient China.This paper selects Baoan Bu,Xuda Yao which crossed by the road as the research object,based on the field measurements,combined with the three-dimensional finite element numerical modeling of a wall-pavement-foundation soil,the vehicle vibration attenuation law of ground on the Great Wall and the dynamic response characteristics of the wall are studied,which provides a reference for the protection of the ancient Great Wall.The main conclusions are as follows:(1)Field measurement data analysis: The peak value of ground vibration response caused by vehicle driving decreases with the increase of distance from road edge,and the attenuation is faster when the distance from the vibration source is closer,and the attenuation tends to be gentle when the distance from the vibration source is farther.The vibration response law of the wall,the peak value of the vibration response at each measuring point of the city wall increases with the increase of vehicle speed and the increase of the road roughness.In the horizontal range,the vibration peak value of the measuring point near the road edge is greater than that of the measuring point far away.Within the height range: with the increase of the wall height,the vibration peak value decreases to varying degrees.(2)Numerical simulation: ABAQUS establishes the three-dimensional finite element model of wall-pavement-foundation soil.Under the single-vehicle driving load,the influence of vehicle vibration on the wall increases with the increase of vehicle driving speed and vehicle dead weight.With higher speed,as well as the greater self-weigh,the vibration amplitude of the wall and the influence range of vehicle vibration increases.Compared with the single-vehicle,the vibration amplitude of the wall is larger when the two vehicles are driving,and the peak horizontal vibration velocity is about 1.4～2.3 times of the peak velocity when the single vehicle is driving.When the two vehicles are driving in the same direction,the vibration amplitude of the wall is slightly larger than that in the same direction.