ANALYSIS OF ENGINEERING RE-LEVELING VERTICAL DEFORMATION

Using 8 periods re-leveling data of Beijing-tianjin stage of Beijing-shanghai high speed railway, this paper draws the vertical deformation map of Beijin-tianjin area during the period of 2007.3-2011.3 and analyzes the current vertical deformation changing trend along the Beijing-tianjin stage of Beijing-shanghai high speed railway.The result indicates that during the period of 2009.3-2011.3, several sites show positive velocity changing which is contrary to the negative velocity changing of land subsidence before, which may indicates that the regional stress field have changed under external influences.