《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“考虑孔压的边坡三维极限分析”

作者：Radoslaw L. Michalowski and Srinivasa S. Nadukuru

刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，2013年9月，139卷第9期，1604–1610页

关键词：边坡稳定性；极限状态；三维分析；破坏；孔隙水压力

摘要：与二维边坡稳定分析相比，三维（3D）分析工作量大，效率低，结果过于偏安全而不常采用。然而，在区分破坏区域宽度限制的情况下（比如开挖情况下），采用三维稳定性分析的安全评估应该是更合适的。本文基于一个近期提出的刚性-旋转三维机械修正模型对缓坡很常见的低坡脚破坏给出了用于边坡稳定性极限分析的运动学方法。边坡中孔隙水压力的存在大致包含在标量参数ru中。随后给出了考虑临界高度（或这是无量纲系数）的计算结果，并给出了用于具有限定宽度的边坡安全系数直接评估图表和封闭形式的近似公式。其中安全系数随着孔隙水压力的增加而降低，同时随着边坡宽度的增加而降低（破坏区域增加）。

Three-Dimensional Limit Analysis of Slopes with Pore Pressure

Authors: Radoslaw L. Michalowski and Srinivasa S. Nadukuru

Journal: Journal of Geotechnical and Geoenvironmental Engineering, Volume 139, Issue 9 (September 2013), 1604–1610

Key words: Slope stability, Limit states, Three-dimensional analysis, Failure, Pore-water pressure

Abstract: Three-dimensional (3D) slope stability analyses are not performed routinely because they involve increased effort compared with two-dimensional analyses, and because the latter yield more conservative results. However, in cases of distinct limitations of the width of the failure region (e.g., in the case of excavations), an assessment of safety using 3D stability analyses may be more appropriate. The kinematic approach of limit analysis for the assessment of stability of slopes is presented, based on a recently conceived rigid-rotation 3D mechanism modified to include below-toe failures, which are common for gentle slopes. The presence of pore-water pressure in the slope is included approximately using the scalar parameter ru. The results are presented in terms of the critical height (or dimensionless coefficient γH/c ), and also in the form of charts and a closed-form approximation formula that allow for direct assessment of the safety factor for slopes with constrained width. Not surprisingly, the safety factor decreases with an increase in the pore-water pressure and with an increased width of the slope (increased failure zone).

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000867