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三维空间结构和土体非饱和状态,对滑坡稳定性评价具有至关重要的影响。为了深入研究影响三维非饱和土滑坡稳定性的主要因素,以标准算例的三维扩展模型为例,考虑非饱和土的弹塑性本构模型和Fredlund强度准则,开展边坡稳定性数值模拟研究。从外因和内因两个方面,探讨了雨水入渗引起的负孔隙水压力分布和地下水位线的改变以及滑面深度、强度参数等因素对三维非饱和土滑坡稳定性的影响规律。研究结果表明:采用三维分析方法能反映坡体的空间应力状态和滑面的空间形态,各分析因素对滑坡稳定性的影响程度依次为参数?的改变、雨水入渗导致吸力丧失、滑面深度,且?的影响随着滑面深度而增大,而雨水入渗对浅层滑坡的影响较大。
Three-dimensional spatial structure and soil unsaturated state, the stability of landslide evaluation has a crucial impact. In order to further study the main factors affecting the stability of landslides in three-dimensional unsaturated soils, taking the three-dimensional expansion model of the standard example as an example, the elastoplastic constitutive model of unsaturated soils and the Fredlund strength criterion are considered to study the numerical simulation of slope stability. From the external and internal causes, the influences of the negative pore water pressure distribution caused by rain infiltration, the change of groundwater level and the sliding surface depth and strength parameters on the stability of three-dimensional unsaturated landslide are discussed. The results show that the three-dimensional analysis method can reflect the spatial stress state of the slope and the spatial morphology of the sliding surface. The influence degree of the analysis factors on the stability of the landslide is the change of the parameters, the loss of suction due to rain infiltration, the depth of the sliding surface , And the influence of? Increases with the depth of the slip surface, while the rainfall infiltration has a greater impact on the shallow landslide.