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Moving from 2D to a 3D Unsaturated Slope Stability Analysis

机译：从2D过渡到3D不饱和边坡稳定性分析

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Two-dimensional (2D) limit equilibrium analyses remain the most common method of analysis in slope engineering practice. It is commonly perceived that 2D slope stability analysis always provides a more conservative estimate of the 3D slope stability problem. Most previous studies comparing 2D and 3D stability analysis also ignore the effect of negative pore-water pressures (i.e., matric suctions) in the soil zone above the groundwater table. In this paper, a comparison study is reported between 2D and 3D slope stability analysis for soil slopes with a portion of the soil profile having matric suctions. The differences between a 2D and a 3D factor of safety are found to be heightened when unsaturated conditions are considered. The paper also presents a framework for the inclusion of soil suctions in the calculated factor of safety for geotechnical engineering practice. A discussion on reducing a 3-D numerical model to give answers similar to a 2-D slope stability analysis will be presented. A basis for transitioning to 3-D analysis will be developed.
机译：二维（2D）极限平衡分析仍然是边坡工程实践中最常用的分析方法。通常认为2D边坡稳定性分析总是提供3D边坡稳定性问题的更保守的估计。先前比较2D和3D稳定性分析的大多数研究也忽略了地下水位以上土壤区域中负孔隙水压力（即基质吸力）的影响。在本文中，对土壤坡度的2D和3D坡度稳定性分析进行了比较研究，部分土壤剖面具有基质吸力。当考虑到不饱和条件时，发现2D和3D安全系数之间的差异会增大。本文还提出了一个框架，用于在土力工程实践中将吸力包括在计算出的安全系数中。将进行有关简化3-D数值模型以给出类似于2-D边坡稳定性分析的答案的讨论。将为过渡到3-D分析奠定基础。

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