吕玺琳, 周运才. 2016: 渗流条件下盾构隧道开挖面稳定性三维强度折减数值模拟. 工程地质学报, 24(s1): 952-957. DOI: 10.13544/j.cnki.jeg.2016.s1.138
    引用本文: 吕玺琳, 周运才. 2016: 渗流条件下盾构隧道开挖面稳定性三维强度折减数值模拟. 工程地质学报, 24(s1): 952-957. DOI: 10.13544/j.cnki.jeg.2016.s1.138
    LÜ Xilin, ZHOU Yuncai. 2016: THREE-DIMENSIONAL STRENGTH REDUCTION NUMERICAL SIMULATION OF THE FACE STABILITY OF SHIELD TUNNEL UNDER SEEPAGE CONDITION. JOURNAL OF ENGINEERING GEOLOGY, 24(s1): 952-957. DOI: 10.13544/j.cnki.jeg.2016.s1.138
    Citation: LÜ Xilin, ZHOU Yuncai. 2016: THREE-DIMENSIONAL STRENGTH REDUCTION NUMERICAL SIMULATION OF THE FACE STABILITY OF SHIELD TUNNEL UNDER SEEPAGE CONDITION. JOURNAL OF ENGINEERING GEOLOGY, 24(s1): 952-957. DOI: 10.13544/j.cnki.jeg.2016.s1.138

    渗流条件下盾构隧道开挖面稳定性三维强度折减数值模拟

    THREE-DIMENSIONAL STRENGTH REDUCTION NUMERICAL SIMULATION OF THE FACE STABILITY OF SHIELD TUNNEL UNDER SEEPAGE CONDITION

    • 摘要: 采用三维有限元强度折减数值模拟,分析了渗流条件下盾构隧道开挖面稳定性安全系数。基于有限元计算不收敛作为开挖面破坏标准,获得了开挖面主动和被动变形模式下的开挖面稳定安全系数,并得到了开挖面的最终破坏模式。通过对计算结果的整理,获得了支护压力与开挖面安全系数的关系。安全系数存在一个极大值,对应的支护压力即为最优支护压力。最优支护压力在无渗流条件下为静止土压力,在渗流条件下高于静止土压力。渗流条件下开挖面达到主动及被动破坏条件下的极限支护压力均高于非渗流情形。

       

      Abstract: The three-dimensional numerical simulation combined with strength reduction was used to study the face stability of shield tunnel under seepage condition. According to the non-convergence condition in numerical simulation, the safety factors in active and passive deformation modes were obtained. The relationship between the safety factor and the support pressure ratio were obtained by summarizing the numerical results. Safety factor shows a maximum value, which correspond s the optimal support pressure. The optimal support pressure without seepage equals to the lateral earth pressure at rest, and the optimal support pressure under seepage condition is higher than the lateral earth pressure at rest. The limit support pressures of tunnel face under active and passive failure condition with seepage are higher than those without seepage.

       

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