Construction Technology And Mechanical Behavior Study On Twin-Arch And Double-Deck City Tunnel Of Low-Burying

In China's highway construction,the option of double-arched tunnel has increasingly been used in special geological terrain area and brings good economic returns for us.Twin-arch and double-deck tunnel is a new form of large-span tunnel with China's rapid highway construction,and the importance is becoming increasingly in urban transport development of the city.Papers is Zigong City Longhui Road tunnel project as the background.Papers discuss the rock stress field,the rock displacement field and the supporting structure stress field in the construction process of twin-arch and double-deck city tunnel of low-burying,and discuss the impact of the existence of sidewalks board for the tunnel structure.From the Paper,â…¢-class surrouding rock,taking into account the construction of technical difficulty,the construction period,the project cost, and other relevant factors,the middle-hole of the full-face construction method is better than the middle-hole of step method,the middle-hole of the step construction method is better than the three heading construction method.And there are a few impact of the existence of the sidewalk board for the tunnel structure.At the same time,papers study the impact of the existence of pile foundation in the vicinity of twin-arch and double-deck tunnel in existence by FLAC^3Dthree-dimensional numerical simulation.From the paper,after imposing the pile foundation,a lot of adverse changes of the stress state of the supporting structure have taken place and the safety factor of the supporting structure has been some decline.However,the supporting structure of the tunnel can still meet the requirements of the tunnel structure.And the tunnel structure is safe.This study of the paper provides certain information to a few similar design and construction in the future.And I hope that the paper can play a role in promoting of twin-arch and double-deck tunnels application and development.