Due to the spatial variability of material characterisations in deep and large scale excavations, stability assessment is often a challenging task. Numerous slope stability analysis methods based on a range of assumptions and principles are implemented in commercial software packages to ease the process of stability assessment of non-homogeneous and multi-layered slopes. However, the selection of a suitable method remains crucial as the application of an unrealistic or unsuitable method may lead to catastrophic consequences. Besides material shear strength parameters, and analysis methods, non-strength characterisations such as permeability and creep can affect the result of slope stability analysis significantly. In this study, the sensitivity of the stability assessment of a deep excavation in Australia to material characterisations such as friction angle, cohesion and permeability and creep is investigated by the use of different formulations and assumptions of the Limit Equilibrium Method (LEM) and the Finite Element Method (FEM) as the two most common slope stability methods. The results show that the stability assessment is highly sensitive to the applied method and assumptions. Moreover, the role of material strength and non-strength parameters and the selection of a suitable constitutive model in slope stability assessment is presented.

由于深层和大规模开挖中材料特征的空间变异性，稳定性评估通常是一项艰巨的任务。商业软件包中采用了许多基于一系列假设和原理的边坡稳定性分析方法，以简化非均质和多层边坡的稳定性评估过程。但是，选择合适的方法仍然至关重要，因为应用不切实际或不合适的方法可能会导致灾难性的后果。除了材料的抗剪强度参数和分析方法外，非强度特性（例如渗透率和蠕变）也会显着影响边坡稳定性分析的结果。在这个研究中，使用极限平衡法（LEM）和有限元法（FEM）的不同公式和假设，研究了澳大利亚深基坑稳定性评估对材料特性（如摩擦角，内聚力，渗透性和蠕变）的敏感性。 ）作为两种最常见的边坡稳定性方法。结果表明，稳定性评估对所采用的方法和假设高度敏感。此外，介绍了材料强度和非强度参数的作用以及在边坡稳定性评估中合适的本构模型的选择。通过使用极限平衡法（LEM）和有限元法（FEM）作为两种最常见的边坡稳定性方法的不同公式和假设，研究了内聚力，渗透率和蠕变。结果表明，稳定性评估对所采用的方法和假设高度敏感。此外，介绍了材料强度和非强度参数的作用以及在边坡稳定性评估中合适的本构模型的选择。通过使用极限平衡法（LEM）和有限元法（FEM）作为两种最常见的边坡稳定性方法的不同公式和假设，研究了内聚力，渗透率和蠕变。结果表明，稳定性评估对所采用的方法和假设高度敏感。此外，介绍了材料强度和非强度参数的作用以及在边坡稳定性评估中合适的本构模型的选择。