The Analysis About Effect Of Landslide Stability On Tunnel Deformation

For around75%of the region as the mountains or heavy hill in our country,anddue to the geological environment and traffic planning restrictions, many railway wasbuilt in the mountain slope.With China’s socialist economic construction of rapiddevelopment,the investment of infrastructure construction is increasing,so as the tunnelengineering’s more and more application,and tunnel engineering is closely related to thestability of the landslide.Because landslide have great influence on tunnel defect withhigh frequency, which is made China become one of the countries of with the mostserious by landslide hazard tunnel in the world. Every year our country will loss billionsof because of landslide disaster which bring the huge loss to the country and people’slife,it is not only lead to grave social consequences,but also affect the state’s technicaland economic policy.This article started from the change of landslide stability on the impact of tunneldeformation and failure, above all based on the investigation of landslide,carryingoutdoor drilling measurement and consolidation test, analysis the structure of thelandslide,the cause of the landslide and possible causes of resurrection.The assessmentis performed by the landslide stability calculation results, after that based on the surveyof Landslide area tunnel deformation examples,conducting a study on tunnel and slidingsurface relative position and the corresponding tunnel deformationcharacteristics,building the3D model to analogthe disturbed soil caused by tunneldeformation damage when tunnel crossing the landslide.Analysis the stress anddeformation of the tunnel structure failure model under different working conditions.The results show that:Landslide in natural condition is stable,but under the harmfulworking conductions the landslide will be instable such as water-saturated orearthquake,especially Landslide front of scarp section is more likely to occur,whichcaused retrogressive landslide.The landslide instability will produce bias function ontunnel in Landslide area.According to the mechanical model in different positions oftunnel in Landslide area,summing up geomechnical model of the relationship betweenthe landslide and the tunnel deformation.In addition,I perform numerical simulation of the tunnel through the landslide by FlAC3D.Then make analysis of variance betweenresults and the data collected by Field exploration.It turned out that thedisplacement,stress,strain of the tunnel structure under the action of landslide bias hasthe consistent change law.