理論研究 2025年 第卷 第18期
DOI: 10.7672 / sgjs2025180009
馬蹄形盾構隧道開挖面非線性穩定性評估
劉小春1,謝海龍1,金毅1,耿鵬飛1,陳光輝2’3
作者簡介：
劉小春，高級工程師，E-mail: liu_t123456@ 163. com作者單位：
1.中鐵一局集團有限公司，陜西西安 710054; 2.鄭州大學土木工程學院，河南鄭州 450001; 3.中南大學土木工程學院，湖南長沙 410075基金項目：
?2025 年國家資助博士后研究人員計劃（GZC20252112）；湖南省交通科技項目（202303）摘要：
巖土在外力作用下破壞多表現為非線性特征。目前尚缺乏考慮非線性破壞特性條件下馬蹄形盾構隧道開挖面穩定性的研究。基于此，采用非線性 Mohr-Coulomb 失效準則表征巖土非線性破壞特性。通過對圓形旋轉失穩模型改進，建立了馬蹄形旋轉失穩模型。在極限分析法框架下，將非線性 Mohr-Coulomb 失效準則與所構建失穩模型結合，提出了馬蹄形盾構隧道開挖面非線性穩定性評估模型。研究結果表明：忽略巖土非線性破壞特性會導致隧道開挖面穩定性評估偏于不安全；馬蹄形和等面積圓形隧道開挖面穩定性評估結果接近，可采用圓形隧道計算所得極限支護壓力值和三維失穩面對等面積馬蹄形盾構隧道開挖面穩定性進行評估。
English：
Geotechnical failure under external forces is mostly characterized by nonlinear feature. Fewworks investigate the face stability of horseshoe shield tunnel considering nonlinear failure feature. Basedon this, the nonlinear failure feature is denoted by nonlinear Mohr-Coulomb failure criterion. Thehorseshoe rotational failure model is developed by improving the circular rotational failure model. In thecontext of limit analysis method, a nonlinear stability analysis model for horseshoe shield tunnel face isproposed by combining the nonlinear Mohr-Coulomb failure criterion and horseshoe rotational failuremodel. The results show that: Neglecting the nonlinear feature will result in unsafe estimations for tunnelface stability; Stability analysis results of horseshoe tunnel face are close to the those for circular tunnelface with equivalent area. The limit support pressure and three-dimensional failure surface for circulartunnel face can be utilized to assess the stability of horseshoe tunnel face with equivalent area.