Stress Distribution and Variation Law of Steel Arch Frame in Shallow Bias Tunnel and the Reasonable Time for Secondary Lining
Relying on the shallow-buried section with unsymmetrical pressure of Xiaoxiku Tunnel on Xitong Road in Miyun District,Beijing,the stress changes of different parts of the steel arch frame of the tunnel at different con-struction stages are studied through theoretical analysis,numerical simulation,surrounding rock monitoring and measurement technology.Then,the stress distribution and variation law of the steel arch frame are obtained,the reasonable time for secondary lining obtained under the conditions of crown settlement and peripheral convergence of the steel arch frame that satisfies the"spatial effect"and"temporal effect"of surrounding rock displacement in large-section tunnels with weak surrounding rocks is comparatively studied.Through comparison and verification,the op-timal time for secondary lining is determined,providing reference for shallow bias tunnel with weak surrounding rock and similar projects.
shallow bias tunnelsteel arch framestress distributionvariation lawreasonable time for secondary lining
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