Study On The Security Of The Rail Track During The Advance Of Underpass Bridge

With the development of economic, crossings cannot follow the pace of times, so the modification of crossing is in urgent need. Interchange has been widely acknowledged for its particular superiority, thus entering daily social life by big stride. In the process, security should be guaranteed at first because of its importance.This paper simply tells about the background and significance of the research and its importance on the reality. At the same time,it tells about the frame bridge reinforcement at home and abroad,and then finds out the difference and distance between them.The paper describes the factors affecting the line reinforcement, such as the train load,line weight and so on. Then it draws the principle that constrains displacement.This paper depends on actual engineering with the purpose of reinforcing the railway. It analyzes of the deformation and displacement of railway under different load and then receives maximal displacement. Based on theoretical analysis and numerical simulation analysis, this paper figures out the relationship between displacement and load. Engineering optimization comes by theoretical analysis and conclusion. Then it concludes some measures of controlling the deformation and displacement of railway to provide reference for the strengthening of railway.This paper applies software of Midas Civil to simulate. Firstly, it establishes the model and determines a variety of related factors. Then it defines load and applies it, which is definition of all kinds of factors. Based on actual engineering, the paper aims to study the safety of line reinforcement.Through the analysis of railway lines in different load conditions; it can provide support on achieving optimization of the practical engineering. The numerical simulation analysis should consider different conditions of influencing factors. Then it should give sufficient consideration to displacement under all kinds of load.Through the analysis of conclusion, this paper succeeds in getting reasonable and reliable strengthening plan.