Field Monitoring And Numerical Simulation Of Slope Stability Through Mountain Lion Tunnel Excavation

In mountain area, there are a lot of highway-tunnels are built in slope. And some slope's diseases such as deformation and landslide occur frequently in these tunnels. The survey shows that deformation and landslide of slope is correlative with tunnel excavation intimately and endangers security. Due to above causes, the slope deformation mechanism through tunnel excavation is studied in the paper. First to arrange slope monitoring cross section to monitor slope displacement and tunnel displacement, has achieved goal of integrated evaluation the slope stability through tunnel excavation, combining tunneling engineering actual analysis the field measured data, obtained the slope deformation rule and the tunnel deformation characteristic while tunnel excavation. Based on FLAC3D, this paper introduces clue and the step of constructing three dimensional complex geologic body modelling, establishs more accurate reflection scene actual geological condition model, then carries on the numeral simulation analysis, from multiple perspectives reflecting slope deformation rule. Based on numeral simulation analysis, this paper detailly discusses the slope and tunnel interaction deformation mechanism, slope stability before tunnel excavation and tunnel stepping excavation the slope deformation and stress influence rule. Obtained achievement is helpful to establish tunnel portral section slope deformation and stability theory and also can provide theoretical guide for designing effective engineering measures.Along with the rapid development of national economy and the strategy of developing the western region implementing, there will be more and more railroad main lines to build in mountain area and the amounts of slope tunnels will be increasing constantly. It can be foreseeable that a great deal of complicated geotechnical engineering problems such as tunnel deformation caused by landslide at slope site will arise unavoidably. The achievement of the paper will provide important theoretic basis for preventing and reducing disasters and building intelligent management system of the operating tunnels, and optimizing methods of design and excavation of the planning tunnels...