Slope stability analysis by strength reduction

Dawson, Ethan; Roth, W. H.; Drescher, A.

doi:10.1680/geot.1999.49.6.835

Cited by 938 publications

(397 citation statements)

References 10 publications

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“…A shear strength reduction technique was adopted in this program to solve for a factor of safety of slope stability. Dawson et al (1999) exhibited the use of the shear strength reduction technique in this finite difference program and verified numerical results with limit equilibrium results for simple slopes. In this technique, a series of trial factors of safety are used to adjust the cohesion, c and the friction angle, φ, of soil as follows: …”

Section: Methodsmentioning

confidence: 59%

“…San et al (1994) indicated that finite element and limit equilibrium methods could consistently determine the locations of critical slip surfaces and required tensile strength of reinforcement in geosynthetic-reinforced slopes. Dawson et al (1999) concluded that the factors of safety of unreinforced slopes obtained using a finite difference method (FLAC -Fast Lagrangian Analysis of Continua) were in good agreement with those using the limit equilibrium method with a log-spiral slip surface. Han et al (2002) used the same finite difference software (FLAC) to obtain the identical corresponding factors of safety of unreinforced and geosynthetic-reinforced slopes as the Bishop's modified method (limit equilibrium method).…”

Section: Introductionmentioning

confidence: 88%

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Evaluation of Deep-Seated Slope Stability of Embankments over Deep Mixed Foundations

et al. 2004

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When embankments are constructed over soft foundations, deep-seated slope stability often becomes one of the controlling factors in design. Deep mixing methods have been commonly used as an alternative to solve the deep-seated slope stability problem. Bishop's modified method is a commonly adopted approach for analyzing the slope stability of embankments on deep mixed foundations. Bishop's modified method assumed slopes fail along a circular slip surface and the soils along this slip surface provide shear resistance. However, experimental studies have showed that deep mixed columns under a combination of vertical and horizontal forces could fail due to shearing or bending. The possible failure modes depend on the combination of the forces, the strengths of soft soils and deep mixed columns, dimensions and arrangements of deep mixed columns. Since deep mixed columns are formed by mixing a certain amount of admixture (cement or lime or a combination) with soil, they can have a wide range of strengths. A numerical method was used in this study to evaluate the factors of safety varying with the strengths of deep mixed columns and their arrangements with three rows of columns having two different thickness. MohrCoulomb failure criterion was used for embankment fill, foundation soil, and deep mixed columns. A row of deep mixed columns was modeled as a wall in 2-D for simplicity of analysis. The numerical analysis indicated that the critical slip surface of the deep-seated slope failure was not circular when the deep mixed columns were used. The factors of safety obtained using the numerical method were compared with those using Bishop's modified method and Spencer's three-part wedge method. The comparisons indicated that Bishop's modified method yielded significantly higher factors of safety than the numerical method, especially when the deep mixed columns had higher strengths. The Spencer's three-part wedge method yielded lower factors of safety than the numerical method.

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Section: Methodsmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 88%

Evaluation of Deep-Seated Slope Stability of Embankments over Deep Mixed Foundations

et al. 2004

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“…Now there are mainly three judge criterions for the instability of the slope: convergence of calculation, runthrough of the plastic range and sudden change of characteristic position. When using strength reduction method for the slope stability, the calculation convergence is usually used as the criterion [11][12][13] . If the convergent solution cannot be obtained under the designated convergence judgment, the slope loses its stability.…”

Section: Results By Strength Reduction Methodsmentioning

confidence: 99%

Application and comparison of stability analysis of slope using circular arc method and strength reduction method

Xie

2016

MATEC Web Conf.

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Abstract. In order to evaluate the accuracy of strength reduction method using FEM, the safety factors of the uniform clay slope and sand slope are investigated by Fellenius's method, Bishop's method using traditional limit equilibrium method and strength reduction method respectively. The limit equilibrium method is carried out based on the code for foundations in port engineering and the FE analysis is based on Plaxis3D. The results show that the safety coefficient obtained by strength reduction method of FEM is larger than that obtained by limit equilibrium method and the errors are 6.03% and 1.61% for clay slope and 8.54% and 3.99% for sand slope.

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“…This has been done using the strength-reduction method (Dawson et al 1999) that is implemented in FLAC 3D . It can be observed from the results presented in the "Results and Discussion" section that for the present mild slope, the failure mechanism under seismic loading may be approximated by a shallow translational regime.…”

Section: Comparison With Engineering Techniquesmentioning

confidence: 99%

Application of an Anisotropic Constitutive Model for Structured Clay to Seismic Slope Stability

Taiebat

Kaynia

Dafalias

2011

J. Geotech. Geoenviron. Eng.

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The anisotropic nature of response and degradation of shear strength from the undisturbed condition to the remolded state are two fundamental and challenging aspects of response in some clay deposits. This paper presents a comprehensive, yet flexible and practical, version of the SANICLAY model and its application to a seismic slope-stability problem. The model is based on the well-known isotropic modified Cam-Clay model with two additional mechanisms to account for anisotropy and destructuration. The model has been efficiently implemented in a three-dimensional (3D) continuum, coupled, dynamic, finite-difference program. The program has been used to analyze the seismic response of clay slopes to gain better insight into the role of the previously mentioned parameters in real applications. Different aspects of the model, including anisotropy and destructuration, and their effects on the earthquake-induced strains and deformations in the slope have then been explored and presented. By providing a link between the model parameters and the soil's undrained shear strength, which is a well-known engineering parameter, a benchmark comparison has been made between the results of the present advanced model and those of an engineering approach. To this end, a modified Newmark sliding-block analysis has been used, in which the yield acceleration is gradually reduced as block sliding progresses during the earthquake. It is observed that although the two analyses display the same trends, the modified Newmark sliding-block method provides conservative results compared with those obtained from the developed simulation model.

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Slope stability analysis by strength reduction

Cited by 938 publications

References 10 publications

Evaluation of Deep-Seated Slope Stability of Embankments over Deep Mixed Foundations

Evaluation of Deep-Seated Slope Stability of Embankments over Deep Mixed Foundations

Application and comparison of stability analysis of slope using circular arc method and strength reduction method

Application of an Anisotropic Constitutive Model for Structured Clay to Seismic Slope Stability

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