管棚支护下软岩隧道掌子面稳定性研究

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中图分类号：U451 文献标志码：A

本文引用格式：，等.管棚支护下软岩隧道掌子面稳定性研究[J].华东交通大学学报，2025，42（3）：31-39.

Study on the Stability of Tunnel Face of Soft Rock Tunnel Under the Pipe Shed Support

HuRuiqi，ZhangHaina，DuKe，JiangXuehui （SchoolofCivilEngineering and Architecture，East China Jiaotong University，Nanchang 33oo13，China）

Abstract：To reveal the reinforcement mechanismof pipe shed support on the tunnel face of soft rock tunnel and evaluate the stabilityofthe tunnel face under pipe shed support，the numerical simulation method is used to compare and analyzethe failure modeof tunnel face with or without pipe shed support.Then，based on the numerical simulation results，anew parabolic arch-logarithmic spiral tunnel face failure model considering pipe shed support and soil arch efect was proposed，and the calculation method of tunnel face safety factor under pipe shed support was derived by upper bound limit analysis method and strength reduction method.Finally，the influence of surrounding rock parameters and pipe shed support parameters on the stability of tunnel face was discussed. The research results indicate that when the instability failure of the tunnel face without pipe shed support occurs， the surrounding rock above the tunnel face forms a large collapse arch and a smallcollapse arch.Because of the pipe shed support，the instability failure of the tunnel face dose not develop to the vault.Meanwhile the pipe shed support prevents the formation of local collapse arch above the unsupported section，and makes the displacement direction of the surrounding rock above the unsupported section change from vertical downward to extrusionto the tunnel face.The safety factorof tunnel face stability increases with the increase of internal friction angle，cohesion of surrounding rock and the size of pipe shed，and increases withthe increase of single excavation length and pipe shed spacing.Too large size of the pipe shed is not economical for enhancing the stability of the tunnel face.

Key words： tunnel face stability; pipe shed support; soil arching effect; limit analysis; safety factor

Citationformat：HUR Q， ZHANG HN，DUK，et al.Studyon the stability of tunnel faceof soft rock tunnel under the pipe shed support[J]. Journal ofEast China Jiaotong University，2025， 42（3）： 31-39.

随着我国公路交通网络向西部山区发展，隧道施工难以避免穿越大量软弱围岩地层。（剩余11836字）