为探究任意盾构角度影响下隧道掌子面的稳定情况,以向上倾斜盾构隧道为例,基于线性Mohr-Coulomb强度准则,运用空间离散技术及“点生点”技术,考虑倾斜角度对隧道掌子面稳定性的影响,通过改进现有的隧道掌子面三维主被动破坏模型,实现了倾斜隧道掌子面的主被动破坏极限支护压力的求解,并建立了线性Mohr-Coulomb准则下倾斜隧道掌子面三维主被动破坏模型,生成了与之对应的主被动破坏模型的能耗方程。通过本文模型计算结果与现有模型和数值模拟的计算结果进行对比分析,验证了本文所建立的倾斜隧道掌子面三维主被动破坏模型的合理性。结果表明,任意盾构纵向倾角是影响掌子面稳定性的重要因素,不可忽略;本文所建立的任意角度掌子面三维旋转主被动破坏模型相比现有模型更接近真实解,在掌子面稳定性分析时能够得到更优的分析结果,为类似隧道盾构施工的安全性提供了有效的理论指导与参考。
In order to investigate the stability of tunnel palm face under the influence of arbitrary shield angle, we consider the influence of tilt angle on the stability of tunnel palm face based on linear Mohr-Coulomb strength criterion and the spatial discretization technique and "point-generated point" technique proposed by Mollon et al. By improving the existing three-dimensional active-passive damage model of the tunnel palm face, the ultimate support pressure of the active-passive damage of the inclined tunnel palm face is solved, and the three-dimensional active-passive damage model of the inclined tunnel palm face under the linear Mohr-Coulomb criterion is established, and the corresponding energy consumption equation of the active-passive damage model is generated. The calculation results of the model in this paper are compared and analyzed with those of existing models and numerical simulations to verify the rationality of the three-dimensional active-passive damage model of inclined tunnel palm face established in this paper. The results show that: the arbitrary shield longitudinal inclination angle is an important factor affecting the stability of the palm face and cannot be neglected; the three-dimensional rotational active-passive damage model of the palm face at any angle established in this paper is closer to the real solution than the existing model and can obtain better analytical results in the stability analysis of the palm face, which provides an effective theoretical guidance and reference for the safety of shield construction in similar tunnels.
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