Stability Analysis and Evaluation of a Tunnel Entrance Slope Under Complex Disaster-Prone Environments
Influenced by rainfall,strong earthquakes,and intensive engineering activities,the slope at the tunnel entrance may experience collapses,landslides,debris flows,and other geological disasters,especially under the complex conditions of violent earthquakes,high geostress,abrupt slopes,and extremely cold environments.To explore the stability of tunnel entrance slopes under different working conditions in complex disaster-prone environments,the Jiarishan tunnel in southwest China was taken as an example,and a"space-air-ground"integrated investigation technology combining unmanned aerial vehicle(UAV)photography,surface trenching,laboratory experiments,field tests,and cave surveys was employed to obtain accurate engineering geological information.Typical failure characteristics of the studied slope were systematically revealed,and the two failure causes and evolution models of the slope were discussed.In addition,the slope stability under different working conditions was qualitatively analyzed using the limit equilibrium method and three-dimensional numerical simulation.The results indicate that the stability factor of the slope at the Jiarishan tunnel entrance is always greater than 1.15 under natural,rainstorm,and earthquake working conditions.Overall,the slope is stable except for the local deformation and instability of the shallow horizon of the posterior margin.This research can provide theoretical guidance and technical support for similar tunnels in terms of siting,construction,and operation safety.
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