Elastic-plastic large deformation analysis of soil slopes

Snitbhan, Nimitchai; Chen, Wai‐Fah

doi:10.1016/0045-7949(78)90006-8

Cited by 32 publications

(6 citation statements)

References 15 publications

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“…Therefore, a legitimate interpretation of the LS is important. There are various LS criteria to identify the slope failure such as experimental tests [22], limiting the shear stress on the potential failure surface [23], divergence of the computation problem [8], calculation of the total equivalent plastic strain zone [24], running-through of the yielding zone, or a prescribed generalized shear strain developed from the toe through the crest of the slope [25], a rapid increase in displacement [9], and the formulation of an initial value problem to trace the critical slide line [26].…”

Section: Strength Reduction Methodsmentioning

confidence: 99%

An Improved Strength Reduction-Based Slope Stability Analysis

Kolbadi¹,

Sadoghi-Yazdi

Hariri-Ardebili

2019

Geosciences

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Slope uncertainty predominantly originates from the imperfect analysis model and the inaccuracy and imprecision of the observations. The strength reduction method (SRM) is widely used to attain the safety factor (SF) of the slopes, which is similar to interpretation of the limit state (LS). In this paper, the spectral element method (SEM), using an elasto-plastic Mohr–Coulomb failure criterion, is employed to project the plausible LS of the soil slopes. An iterative SRM search method is proposed to evaluate the SF of the slopes regardless of the LS interpretation. The proposed SRM paradigm encompasses the design trigger to trace the uncertain parameters in decision-making. This method is applied to three numerical examples: (1) a homogeneous dry slope, (2) a dry slope with a weak layer, and (3) a partially-wet slope with a weak layer. It is shown that for the case study examples, the proposed SRM reasonably converges to the required precision. Results further are compared and contrasted with some of the conventional and standard techniques in slope stability. This hybrid procedure paves the road for fast and safe stability analysis of man-made and natural slopes.

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Section: Strength Reduction Methodsmentioning

confidence: 99%

An Improved Strength Reduction-Based Slope Stability Analysis

Kolbadi¹,

Sadoghi-Yazdi

Hariri-Ardebili

2019

Geosciences

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“…some test of bulging of the slope profile (Snitbhan and Chen 1978), limiting of the shear stresses on the potential failure surface (Zienkiewicz and Taylor 1989), full extension of the plastic zone from the toe to the crest of the slope or non-convergence of the solution (Duncan and Dunlop 1969). Dawson and Roth (1999) defined the slope failure as the time, when the ratio of unbalanced force to applied load is in excess of 0.1%.…”

Section: Slope Failure Criterionmentioning

confidence: 99%

Effects of anisotropy in correlation structure on the stability of an undrained clay slope

Chenari

Alaie

2015

Georisk: Assessment and Management of Risk for Engineered Syste

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Slopes are mainly naturally occurred deposits, so slope stability is highly affected by inherent uncertainty. In this paper, the influence of heterogeneity of undrained shear strength on the performance of a clay slope is investigated. A numerical procedure for a probabilistic slope stability analysis based on a Monte Carlo simulation that considers the spatial variability of the soil properties is presented to assess the influence of randomly distributed undrained shear strength and to compute reliability as a function of safety factor. In the proposed method, commercially available finite difference numerical code FLAC 5.0 is merged with random field theory. The results obtained in this study are useful to understand the effect of undrained shear strength variations in slope stability analysis under different slope conditions and material properties. Coefficient of variation and heterogeneity anisotropy of undrained shear strength were proven to have significant effect on the reliability of safety factor calculations. However, it is shown that anisotropy of the heterogeneity has a dual effect on reliability index depending on the level of safety factor adopted.

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“…There are several possible definitions of failure, for example, some test of bulging of the slope profile [20], limiting of the shear stresses on the potential failure surface [21], or nonconvergence of the solution [22]. These are discussed in Abramson et al [23] but without resolution.…”

Section: Determination Of the Factor Of Safetymentioning

confidence: 99%

Three-Dimensional Stability Analysis of a Homogeneous Slope Reinforced with Micropiles

Sun

Wei

Zhao

2014

Mathematical Problems in Engineering

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Micropiles are widely used to reinforce slopes due to their successful performance and fast construction. In this study, a simple nonlinear method is proposed to analyze the stability of a homogeneous slope reinforced with micropiles. This method is based on shear strength reduction technique, in which the soil behavior is described using the nonassociated Mohr-Coulomb criterion and micropiles are modeled as 3D pile elements. A series of slope stability analyses is performed to investigate the coupled mechanism of micropile system, and the optimum of pile position, depth of embedment, and length of truncation are analyzed. Results show that the position of micropile system plays an important role not only in the calculation of the safety factor, but also in locating the failure surface, which demonstrates the dominating coupled effect exists between micropiles and slope. The critical embedment depth of the micropile is about 2 times the length of micropile above the critical slip surface, and the micropiles flexure rather than rotation becomes increasingly prevalent as the depth of micropiles embedment increases. Truncation of micropiles may improve the capacity of the micropile system, and the largest truncation length of micropile is about 1/4 depth of critical slip surface in this study.

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Elastic-plastic large deformation analysis of soil slopes

Cited by 32 publications

References 15 publications

An Improved Strength Reduction-Based Slope Stability Analysis

An Improved Strength Reduction-Based Slope Stability Analysis

Effects of anisotropy in correlation structure on the stability of an undrained clay slope

Three-Dimensional Stability Analysis of a Homogeneous Slope Reinforced with Micropiles

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