A Study On Construction Technique Of A Double-arch Tunnel In Guangwu Expressway

When constructing a double-arch tunnel in the geologic conditions of the weak wall rock, Because of the complex and multivariate geological condition, including the numerous disturbance to the wall rock when excavation, it will increase the risk of construction the tunnel. It has put forward to the higher demand of excavating the hole , choice of the early days shoring parameters and form structure of shoring. Present in domestic, there has a little case of construction the double-arch tunnel in the weak wall rock, so we haven't mature experience.This article is a study of the double-arch tunnel in Guangwu freeway, Focuses on the excavation technology of the double-arch tunnel. Including the choice of construction project, construction of the enter, construction of the middle wall, construction of the major tunnel and construction monitoring.This article was focus on discussing when the double-arch tunnel was in weak wall rock and have't been affected by the groundwater and the overall performance is in a good condition, the pair arch tunnel was adopted three guide hole—Whole section second lining build technics. At the same time, in shallow burying and partial pressure and the period of geological condition is terrible, adopted middle guide hole—cross (crd) the next act of the construction process.Through the scientific measurement and monitoring, we can effectively coaching and ensuring safe and efficiently to construction the tunnel, And successfully to finish the project. Thereby we can argued in the special geological topography, the terrain, and the conditions, adopted three guide hole—Whole section second lining build technics and middle guide hole—cross (crd) the next act of the construction process's .feasibility and reliability, Improving and optimizing the construction of the tunnel in weal wall rock.Through studying the construction of the tunnel, we can command the construction technics. Accumulating construction technology of the data and experience, it has laid the foundation of development of the double-arch tunnel in weak wall rock. With a reference when construction the similar project in home and abroad.