The Excavation Simulation Analysis Of The Tunnel Pass Through Airport Runway

With the economic and urban transportation enterprise growth,people graduallyrealize that only with underground railway development as the backbone oflarge-capacity and fast traffic system, we can fundamentally solve existing in theurban traffic is heavy, congestion problem。The core of the metro project is alsoensure the tunnel excavation construction stage and the safety of the operation of late，however, how to control of surrounding rock tunnel excavation disturbance andcontrol of the ground surface settlement is the key problem of the process of buildingthe subway tunnel。In recent years，with the development of urban transportation，More and more metro tunnel construction must be through the airport because needbelow，so to the tunnel construction of metro and greatly increasing difficulty。Due tothe use of the special airport runway，under the airport tunnel in engineering needs toconsider the process of tunnel excavation of the influence of the runway，it make surethe settlement of the runway、the displacement and stress of the tunnel and tunneloptimal turns the soil depth。The airport tunnel under the project example in domesticwear less，tunneling on the influence of the runway to the literature were rare，it isnecessary to research in this aspect for the subsequent experience similarengineering。Based on the planning of jiangbei airport tunnel project to rely on, the major thefollowing several aspects of the work：①First explains tunnel excavation and construction process of the mechanismof surface subsidence caused by the factors, and lists the surface subsidence caused bytunnel excavation at home and abroad and the research on the laws of the presentsituation;②And then that the relevant rules for runway sedimentation value regulation,tunnel construction mechanics and construction process simulation method,explained；③The buried depth of the tunnel on the system division and the mainconstruction method of summary and tunnel excavation process surrounding rockstress the process of forming loose and mechanism;④Detailed summarized the tunnel excavation process, causes the formation ofsettlement of experience theory predicts methods; ⑤The planning of the Chongqing light railway line of the second phase of theproject in the next section jiangbei airport tunnel project, based on the runway of thetunnel in the construction process of large finite element software ANSYS usingtwo-dimensional and three-dimensional numerical simulation research, through to indifferent buried depth conditions, tunnel in the construction of the tunnel structuredisplacement, stress change and the runway in construction process, side pressurecoefficient and subsidence ratio in table comprehensive analysis, suitable for thepurpose that the optimal depth.