Limit state analysis of earthen slopes using dual continuum/FEM approaches

Swan, Colby C.; Seo, Young Kyo

doi:10.1002/(sici)1096-9853(199910)23:12<1359::aid-nag39>3.0.co;2-y

Cited by 81 publications

(23 citation statements)

References 9 publications

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“…Some recent developments of methods to calculate the factor of safety include more accurate computation of the interslice stress distributions [ e.g. , Duncan , 1996; Yu et al , 1998; Swan and Seo , 1999] and numerical algorithms for shear strength reduction analysis from finite element methods for multidimensional analysis under a continuum mechanics framework [e.g., Matsui and San , 1992; Smith and Griffiths , 2004; Krahn , 2003]. The classical limit‐equilibrium methods described above and a hybrid FEM‐limit equilibrium method [ Krahn , 2003; GEO‐SLOPE International , 2007] represent the state‐of‐the‐art in slope stability analysis and will be used in what follows for comparison with the new LFS method.…”

Section: Introductionmentioning

confidence: 99%

Analysis of rainfall‐induced slope instability using a field of local factor of safety

Şener-Kaya

Wayllace

et al. 2012

Water Resources Research

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[1] Slope-stability analyses are mostly conducted by identifying or assuming a potential failure surface and assessing the factor of safety (FS) of that surface. This approach of assigning a single FS to a potentially unstable slope provides little insight on where the failure initiates or the ultimate geometry and location of a landslide rupture surface. We describe a method to quantify a scalar field of FS based on the concept of the Coulomb stress and the shift in the state of stress toward failure that results from rainfall infiltration. The FS at each point within a hillslope is called the local factor of safety (LFS) and is defined as the ratio of the Coulomb stress at the current state of stress to the Coulomb stress of the potential failure state under the Mohr-Coulomb criterion. Comparative assessment with limit-equilibrium and hybrid finite element limit-equilibrium methods show that the proposed LFS is consistent with these approaches and yields additional insight into the geometry and location of the potential failure surface and how instability may initiate and evolve with changes in pore water conditions. Quantitative assessments applying the new LFS field method to slopes under infiltration conditions demonstrate that the LFS has the potential to overcome several major limitations in the classical FS methodologies such as the shape of the failure surface and the inherent underestimation of slope instability. Comparison with infinite-slope methods, including a recent extension to variably saturated conditions, shows further enhancement in assessing shallow landslide occurrence using the LFS methodology. Although we use only a linear elastic solution for the state of stress with no post-failure analysis that require more sophisticated elastoplastic or other theories, the LFS provides a new means to quantify the potential instability zones in hillslopes under variably saturated conditions using stress-field based methods.

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Section: Introductionmentioning

confidence: 99%

Analysis of rainfall‐induced slope instability using a field of local factor of safety

Şener-Kaya

Wayllace

et al. 2012

Water Resources Research

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“…Most of the FEM slope stability analyses use Strength Reduction Method (SRM) or GravityInduced Method (GIM) for determining the minimum factor of safety [14,15]. In these methods, shear strength parameters are reduced or the load level increases gradually until triggering of slope failure.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Dry Sandy Slopes Adjacent toDynamic Compaction Process

Ghanbari

Hamidi

2017

Scientia Iranica

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Abstract. Dynamic compaction is a useful economic method for improving di erent soil types, especially loose sandy lls. However, the method has been rarely used in the vicinity of slopes due to stability concerns. In this research, dynamic compaction method adjacent to slope edge was numerically simulated using 2D plain-strain nite element models. Stability of slope models under di erent compaction energies and slope geometries at the same initial static Factor of Safety (FS) was investigated considering di erent stability criteria. These criteria include Peak Particle Velocity (PPV) or Peak Particle Displacement (PPD) on the slope, rate of change in plastic volumetric strains, yield stress ratio on the induced slip surface, and the ratio of crater depths in at and sloped models. Safe compaction distances from slope heel were calculated for di erent criteria, and it was concluded that PPV criterion yields the most conservative distances, but PPD criterion almost shows the smallest safe distances. Based on comparison of di erent criteria, it was concluded that combination of yield stress ratio and rate of plastic volumetric strain achieves the most acceptable safe compaction distance values for consideration in slope stability analyses.

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“…A great amount of research work on this method has been conducted (Dawson et al, 1999;Lian et al, 2001;Zheng and Zhao, 2004). The third method based on FEM is the centrifugal loading method (or the gravity increase method) (Swan and Seo, 1999;Xu and Xiao, 2007;Li et al, 2009). The principle of the centrifugal loading method is opposite to that of the SRM.…”

Section: Introductionmentioning

confidence: 99%

Microseismic monitoring and numerical simulation on the stability of high-steep rock slopes in hydropower engineering

Tang

et al. 2015

Journal of Rock Mechanics and Geotechnical Engineering

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a b s t r a c tFor high-steep slopes in hydropower engineering, damage can be induced or accumulated due to a series of human or natural activities, including excavation, dam construction, earthquake, rainstorm, rapid rise or drop of water level in the service lifetime of slopes. According to the concept that the progressive damage (microseismicity) of rock slope is the essence of the precursor of slope instability, a microseismic monitoring system for high-steep rock slopes is established. Positioning accuracy of the monitoring system is tested by fixed-position blasting method. Based on waveform and cluster analyses of microseismic events recorded during test, the tempo-spatial distribution of microseismic events is analyzed. The deformation zone in the deep rock masses induced by the microseismic events is preliminarily delimited. Based on the physical information measured by in situ microseismic monitoring, an evaluation method for the dynamic stability of rock slopes is proposed and preliminarily implemented by combining microseismic monitoring and numerical modeling. Based on the rock mass damage model obtained by back analysis of microseismic information, the rock mass elements within the microseismic damage zone are automatically searched by finite element program. Then the stiffness and strength reductions are performed on these damaged elements accordingly. Attempts are made to establish the correlation between microseismic event, strength deterioration and slope dynamic instability, so as to quantitatively evaluate the dynamic stability of slope. The case studies about two practical slopes indicate that the proposed method can reflect the factor of safety of rock slope more objectively. Numerical analysis can help to understand the characteristics and modes of the monitored microseismic events in rock slopes. Microseismic monitoring data and simulation results can be used to mutually modify the sensitive rock parameters and calibrate the model. Combination of microseismic monitoring and numerical simulation provides a more objective basis for the numerical model and parameters and a solid mechanical foundation for the microseismic monitoring.

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Limit state analysis of earthen slopes using dual continuum/FEM approaches

Cited by 81 publications

References 9 publications

Analysis of rainfall‐induced slope instability using a field of local factor of safety

Analysis of rainfall‐induced slope instability using a field of local factor of safety

Stability Analysis of Dry Sandy Slopes Adjacent toDynamic Compaction Process

Microseismic monitoring and numerical simulation on the stability of high-steep rock slopes in hydropower engineering

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