The Post-Earthquake Assessment And Renovation Technology Research Of Railway Subgrade Retaining Structure

5.12 Wenchuan earthquake occurred in the alpine and gorge region, earthquake and triggered landslides, avalanches, falling and dangerous rocks and other geological disasters, have a huge destructive effect on the existing railway subgrade and retaining engineering. Collapse, sliding and cracking of side slope and subgrade influence transportation safety and cause huge economic losses.The post-earthquake assessment and renovation technology research of railway subgrade retaining structure have been certain research achievements home and abroad, and successfully used in it. Japan has a leading position in this field. But acrossed the collected data, it is found that methods also lack of systematic research,, especially on the post-earthquake reinforcement techniques of retaining structure. On the other hand, the Wenchuan earthquake is nearly the world's largest intraplate earthquake in the century, and the damage to the existing line caused by Wenchuan earthquake is unmatched by any earthquake. So many reinforcement techniques of the existing line are not suitable for it only if it is improved. This article unifies the research project of "the post-earthquake assessment and renovation technology research of railway subgrade retaining structure ", makes a research on road shoulder and embankment retaining wall under seismic force effect.This article classifies the diseases caused by Wenchuan earthquake of existing railway subgrade, analyzes the damage mechanism, and proposes reinforcement and restoration measures. Reliability and effect of reinforcement as adding piles are studied with the road shoulder and embankment retaining wall as the research objects respectively. This article uses FLAC3D to build three-dimensional model of retaining walls, inputs El Centro earthquake seismic waves as earthquake signals, analyzes the horizontal displacement, earth pressure and stable coefficient on the back of retaining wall before reinforcement, horizontal displacement on the back of retaining wall and pile body moment on anchorage section after reinforcement under the seismic acceleration, and obtains retaining wall's forcing and deformation distribution before and after reinforcement under different seismic forces.The results show that road shoulder and embankment retaining wall will lose steady or failure under 6 different seismic acceleration. So it can not meet the seismic design requirements and need reinforcement. Adding piles before retaining wall can effectively improve the force and deformation of retaining wall, and enhance the stability of retaining wall.