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Analysis of the critical pool level of partially submerged slopes
Author(s) -
Wang Wei,
Griffiths D.V.
Publication year - 2019
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.3022
Subject(s) - hydrostatic equilibrium , factor of safety , geotechnical engineering , mechanics , slope stability , finite element method , stability (learning theory) , critical load , geology , safety factor , hydrostatic pressure , mathematics , geometry , structural engineering , engineering , computer science , buckling , physics , quantum mechanics , machine learning
Summary Partially submerged c ′ − φ ′ slopes with a horizontal water table exhibit a critical pool level at which the factor of safety becomes a minimum. The phenomenon was first identified using finite element methods, but in this paper, a more thorough analytical investigation is presented. The approach described herein assumes a rigid block sliding with a circular failure mechanism, combined with optimization software to identify the critical circle. The method is initially validated against known slope solutions that assume circular and log‐spiral mechanisms and shown to give excellent agreement, especially for flatter slopes. The method is then applied to partially submerged slopes with a focus on the critical pool level. Through detailed investigation of the overturning and restoring moments in the stability analyses, the critical pool level phenomenon is shown to lie in the trade‐off between the destabilizing effects of internal pore pressures on soil strength and the stabilizing effect of external hydrostatic water pressures on the slope surface.