Research on the Instability Mechanism and Support Scheme of Railway Tunnel Working Face in Carbonaceous Phyllite Formation Under High Ground Stress
The article takes the carbonaceous phyllite formation of a certain tunnel as the engineering background,and uses the FLAC3D-PFC3D coupling model to analyze the schemes of double-layer steel arch support,weakened steel arch near the excavation face,and weakened steel arch support far away from the excavation face.The results indicate that double-layer steel arches can effectively reduce large deforma-tions in soft rocks.When the stiffness of one of the steel arches weakens,the ability of the support to control deformation weakens;However,it still demonstrates reliable performance in controlling deformation.And the peripheral cumulative convergence curves under H3 and H4 sup-port do not coincide,indicating that when using two layers of steel arches with different stiffness for support,it is more reasonable to place the steel arch with lower stiffness on the outer side.
High ground stressCarbonaceous phyllite formationRailway tunnelInstabilitySupport
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