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Face stability of a tunnel excavated in saturated nonhomogeneous soils

机译：饱和非均质土中开挖隧道的面板稳定性

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摘要

Most subways excavated in nonhomogeneous and water-bearing soils but few existing analytical models focus on the combined effect of soil nonhomogeneity and pore water pressures. To address this issue, a three-dimensional (3D) rotational collapse mechanism is improved to investigate the effect of vertical variability of soil strength on the face stability of a circular tunnel excavated in saturated nonhomogeneous soils by means of the kinematical approach of limit analysis. The pore water pressure distribution obtained numerically is interpolated on the 3D improved collapse mechanism by a linear interpolation technology. The effectiveness of the developed model is verified by comparing the required face pressures with the existing solutions, the numerical simulations and the monitoring data of the Shenzhen urban rail transit line 9 project. The effects of nonhomogeneous friction angles and cohesion and water table elevation on the face stability are investigated.
机译：大多数地铁是在非均质和含水的土壤中开挖的，但很少有现有的分析模型关注土壤非均质性和孔隙水压力的综合影响。为解决此问题，通过极限分析的运动学方法，改进了三维（3D）旋转坍塌机制，以研究土壤强度的垂直变化对饱和非均质土壤中圆形隧道开挖面稳定性的影响。通过线性插值技术将数值获得的孔隙水压力分布插值到3D改进的塌陷机理上。通过比较所需的工作面压力与现有解决方案，数值模拟和深圳城市轨道交通9号线项目的监测数据，验证了所开发模型的有效性。研究了非均匀摩擦角，内聚力和地下水位高程对面部稳定性的影响。

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