Cross Tunnel With Small Interval Construction Technology Research And Finite Element Simulation Analysis

Cross tunnel with small interval is One kind of peculiar circumstance of tunnel with small interval. tunnel with small interval is the new kind of tunnel which have the interval less than 150% of the width of the tunnel. it is the special pattern out of the connect arch tunnel and normal isolated tunnel. tunnel with small interval have a lot of excellence such as it can fit the whole system of roadway and it is easier to built and do the waterproof treatment, it takes less money but save more time for a whole project. tunnel with small interval have been adopted as a new kind of structure form. The Cross tunnel with small interval in this paper is proved to be a very hard project as the smallest interval is 1.7m.The technology of the such tunnel with small interval is not mature enough and there are little experience of the construction of this kind of tunnel. The rock wall between tow tunnels is far thinner than normal isolated tunnel and the rock was disturbed by the build of the tunnel, so it bring difficulties to analysis the stability of the rock and the stress situation, So to analysis and summarize the example of such kind of project is very significative to the development of the technology of building Tunnel with small interval.This dissertation rely on the project of the i,j ramp tunnels of the Gaojiu road, probe into the whole process of New Austrian Tunneling method construction.Then use the Finite element software to simulate the process of the build of tunnels. and the follow details are:â‘ Based on the theory of rock dynamite destroy and impact lord of dynamic intensity ,it did some theoretic analysis on build of the constructing tunnel which affects the tunnel already exist below.â‘¡It estimate the different construction methods which disturb the tunnel already exist below most by Finite element method.â‘¢Based on the project of the i,j ramp tunnels of the Gaojiu road, it introduced some key points and difficulties of the whole process of the project.â‘£This paper made use of Finite element software MSC.Marc try to optimize the scheme of the blasting, and to present my own best scheme.