Dynamic Analysis Of Mining Tunnel And Airport Runway Under Aircraft Moving Loads

With the development of modern network planning, as well as the own development needs of some large airports, there are more and more highway, rail transport, railway which is crossing under the airport runway and airport flight area which have the service lanes or other underground structures beneath. In the construction and the use stage of the tunnel which under the runway of plane, moving load of plane have some effects on the tunnel structure, also the excavation of tunnel has a effect on the runway which have extremely strict requirements.At present,there are less information about the related researches, research results are very limited too.On the background of fast tie lines and automobile passage engineering between T3and T2airport terminal of Beijing Capital International Airport and with the comprehensive methods of investigation, documentary and, three-dimensional numerical simulation, This paper analysis the mechanical and deformation characteristics of tunnel structure, and the influence of the construction process for the airport runway with the aircraft moving loads when the double span conjoint arch tunnel is vertical down-traversing the airport run-way. The major research work is as follows:1.Collect related cases and data at home and abroad and choose the largest airbus A380as applied loads. Determine the aircraft moving loads and simplified method at last with comparative analysis for the dynamic response of two kinds of simplified methods.2.The Three-dimensional finite element model is built using the reasonable dynamic boundary conditions, selecting four typical landing position and considering three construction stage respectively, to analyze the deformation of the tunnel and the impact on the runway under the dynamic loads of the aircraft. The results show that the tunnels deformation law is basically the same in the four landing point conditions, and there is a largest vertical deformation of the tunnel when the aircraft glide through the tunnel area and the landing points located outside the tunnel boundary.3.The paper analysis selects the maximum results of dynamic response of the four load cases, focuses on the analysis of the vertical displacement, lateral displacement of the tunnel and steel support,and deformation of the board of the runway, and the maximum principal stress. The conclusion can provide reference for related projects.