Dynamic Analysis Of Surface Of Ultra-shallow Buried Tunnel Under Dynamic Load

With the rapid development of high-speed railway and highway construction in our country and the limitation of surface conditions,more and more tunnels will be selected in the high-speed railway or highway project to pass some special areas underground.Based on the construction of Jiaozhou airport tunnel,through in-depth investigation of the geological environment in which the project is located and the engineering mechanics characteristics of mudstone and argillaceous sandstone,the dynamic analysis of the surface of ultra-shallow tunnel under dynamic load is carried out.The airport tunnel will pass through the Jiaodong International Airport.Upon completion of the tunnel,it will bear the compaction of roadbed and the vibration load of roller and the dynamic load of aircraft taxiing.The dynamic response of the tunnel structure under dynamic load is studied by FLAC^3D finite element software.The main contents of the paper are the following aspects:?1?To collect relevant case and research data at home and abroad,the single wheel hydraulic vibration roller and the large aircraft A380 and B777 which have great influence on the runway are selected as the acting loads.In this paper,the characteristics of dynamic load time in the compaction process of single wheel vibration roller and the sliding process of two heavy aircraft models are determined.?2?A three-dimensional finite element model of the tunnel structure under the vibration load of a single wheel roller is established,and the vertical displacement and main stress changes of the tunnel structure caused by the vibration load of a single wheel vibrating roller under different lining thickness are analyzed.?3?A three-dimensional finite element model of the tunnel structure under A380and B777 aircraft loads is established.The vertical displacement and principal of the tunnel structure caused by different types of taxitic loads of the A380 and B777 are analyzed in this paper.