| With the rapid development of modern society,the rapid transit network to meet the needs of the citizens is also in a period of rapid development.The complex urban traffic network is composed of high speed railway,rail traffic,highway and aircraft.Some rail transit lines have to go through the airport.There have been many engineering examples of tunnels passing through airports at home and abroad in recent years.Because of the special nature of the airport,there are strict requirements for the settlement and deformation of the runway.At the same time,the landing and sliding of the aircraft have an uncertain influence on the internal force and the deformation of the tunnel.The safety of the runway and the tunnel affects the operational safety of the airport.Once the problem occurs,the consequences are serious.Therefore,this article is based on the section of T3 terminal station to T2 terminal station of Chongqing rail transit line ten,who pass through the Chongqin Jiangbei Airport runway.the research methods such as data investigation,numerical simulation,theoretical analysis and engineering verification are used to analyze the deformation and the force of the runway and the TBM tunnel under the influence of dynamic airplane load.The main research results are as follows:(1)The propagation law of vertical stress of the aircraft is obtained based on the most unfavorable track load and the solution of Boussinesq.The maximum value of the aircraft stress is always 3 meters away from the last row of the aircraft’s center point in the direction of the front wheel’s center point,and the vertical stress decreases rapidly as it is far away from the point.A formula for calculating the influence range of aircraft load on TBM tunnel segments is established,and a formula for calculating the range of runway affected by aircraft loads on TBM tunnel segments is determined.(2)The influence of aircraft dynamic load on runway settlement,tunnel deformation and stress is obtained by three-dimensional finite element numerical simulation.When the aircraft load is located above the vault,it has the greatest impact.(3)The most disadvantageous distribution mode of the additional plane load of the tunnel is determined,and the calculation method of the additional aircraft load is simplified.The force model and the structure design method of the tunnel crossing the runway,who is under the deep or shallow buried,are put forward.(4)The expression and maximum value of the deflection,rotation angle,bending moment and shear force of the concrete runway with a hole below are derived,and a calculation method for the limit value of the soil settlement is put forward.Based on the support project,a relationship between the settlement of the vault and the soil settlement is determined by the strength reduction method.The settlement of vault is controlled to control the settlement of the ground so as to meet the requirement of the settlement limit of the ground. |
