管棚支護(hù)下軟巖隧道掌子面穩(wěn)定性研究

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中圖分類號(hào)：U451 文獻(xiàn)標(biāo)志碼：A

本文引用格式：，等.管棚支護(hù)下軟巖隧道掌子面穩(wěn)定性研究[J].華東交通大學(xué)學(xué)報(bào)，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.

隨著我國(guó)公路交通網(wǎng)絡(luò)向西部山區(qū)發(fā)展，隧道施工難以避免穿越大量軟弱圍巖地層。（剩余11836字）