Stability Analysis of Tunnel Entrance Slopes Containing Weak Interlayers
The weak interlayer has a prominent impact on the stability of the slope and is a potential sliding surface of the slope.In order to study the stability of tunnel entrance slopes containing weak interlayers during excavation and tunnel excavation,MIDAS GTS/NX software was used to simulate the entire construction process,and the stability coefficient of the entrance slope was calculated using Strength Reduction Method(SRM).The results indicate that excavation construction at the entrance of the tunnel will disrupt the original stress balance,leading to tension cracks in the soil at the top of the slope.During tunnel excavation construction,the stability coefficient of the entrance slope will decrease with the excavation process.Considering the vibration caused by tunnel blasting construction and the adverse factors of weak interlayers,it is recommended to increase the length of anchor rods to 10 m in engineering design and construction to control the creep and sliding of weak interlayers and prevent slope instability.
weak interlayerslope at the entrance of tunnelexcavation constructionfinite element simulation
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