【摘要】 边坡失稳是涉及土体大变形的动态演化过程,该过程往往决定了滑坡失事后果。传统的边坡稳定分析方法如极限平衡方法与有限元方法难以模拟边坡失稳演化过程,尤其是失稳后的土体变形破坏过程。边坡失稳受到多重不确定性因素影响,其中一个重要因素是土体参数的空间分布不均匀性。在考虑土体参数的空间不均匀分布情况下,本文采用一种随机极限平衡-物质点法研究边坡不同破坏模式的动态演化过程,同时利用极限平衡方法简单、高效的优点和物质点方法模拟土体大变形破坏的能力。以一个两层不排水土坡算例为例,识别了4种不同的边坡破坏模式(即浅层、中层、深层和渐进),研究了它们的演化过程与土体参数的空间分布之间的关系。结果表明边坡的破坏模式演化过程与土体参数的空间分布密切相关,强调了岩土工程勘察信息对充分表征土体参数空间变异性的重要作用。更多还原

【Abstract】 Slope failure is often a large-deformation process of soils consisting of initiation,run-out and deposition stages. The deformation process determines the landslide consequence. Conventional slope stability analysis approaches such as Limit Equilibrium Method and Finite Element Method may face difficulties in modeling the whole process of slope failure,especially the post-failure process with large deformation of soils. Slope failure is controlled by uncertainties,and one important uncertainty is the spatial variability of soil properties. This study aims to investigate the evolution of slope failure modes at large deformation in spatially variable soils using Random Limit Equilibrium and Material Point Methods. Different types of failure modes are identified from different spatial distributions of undrained shear strength. Results reveal the spatial distribution of soil properties plays a significant role in the evolution of slope failure mode. It is of importance to characterize the in-situ soil properties for slope risk assessment and mitigation.更多还原