Abstract:To study the impact of underpass construction of the newly built natural gas pipeline on Yangcun Grand Bridge of Beijing-Tianjin Intercity Railway, with the background of protecting sleeve project of high-pressure natural gas pipeline passing through Beijing-Tianjin Intercity Railway, the pipe-jacking construction in the section of Yangcun Grand Bridge of Beijing-Tianjin Intercity Railway is designed. The numerical analysis of finite element is carried out for the pipe-jacking underpass construction of the high-speed railway bridge by applying Midas GTS finite element software to obtain the disturbance and displacement of railway bridge pier during the process of pipe-jacking underpass construction of the high-speed railway, and then to cause the change of the structural stress. The related improvement suggestions are put forward after the stress distribution change rules of stratum before and after the construction are revealed.