Non-convergence Criterion on Slope Stability FE Analysis by Strength Reduction Method

Nian, Tingkai; Chen, G. Q.; Wan, S. S.; Mao-tian, Luan

doi:10.4156/jcit.vol6.issue5.9

Cited by 13 publications

(2 citation statements)

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“…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%. Nian et al (2011) indicated that slope deformation and instability to failure process could be analysed by using the strength reduction method.…”

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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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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“…In the cases of geometry of the slope, the slope angle or degree was inversely proportional to the FOS of the slope. As follows, the greater the slope degree , the smaller the FOS then the slope is more likely to be failure (Nian et al 2011).…”

Section: Geometry Of Slopementioning

confidence: 96%

Landslide Simulation Using Limit Equilibrium and Finite Element Method

Ghazaly

Rahim

Jee

et al. 2016

MSF

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Slope stability analysis is one of the ancient tasks in the geotechnical engineering. There are two major methods; limit equilibrium method (LEM) and finite element method (FEM) that were used to analyze the factor of safety (FOS) to determine the stability of slope. The factor of safety will affect the remediation method to be underdesign or overdesign if the analysis method was not well chosen. This can lead to safety and costing problems which are the main concern. Furthermore, there were no statement that issued one of the analysis methods was more preferred than another. To achieve the objective of this research, the soil sample collected from landslide at Wang Kelian were tested to obtain the parameters of the soils. Then, those results were inserted into Plaxis and Slope/W software for modeling to obtain the factor of safety based on different cases such as geometry and homogenous of slope. The FOS obtained by FEM was generally lower compared to LEM but LEM can provide an obvious critical slip surface. This can be explained by their principles. Overall, the analysis method chosen must be based on the purpose of the analysis.

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Geological and geotechnical characterisation of the Khotila landslide in the Dharchula region, NE Kumaun Himalaya

et al. 2019

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, a severe landslide had occurred in the vicinity of Khotila village in Dharchula, region of NE Kumaun Himalaya. This landslide may be classified as typical rockslide, involving thin veneer of debris on the slope as well as the highly shattered rockmass. The slide has been divided into three morpho-dynamic zones, viz., (i) Zone of detachment between elevation 1000 and 960 m, (ii) Zone of transportation between elevation 960 and 910 m, and (iii) Zone of accumulation between elevation 910 and 870 m. The landslide had occurred at the end of the monsoon season when the slope was completely saturated. It has been noted that the area received ∼88% rainfall during the monsoon months which is about two times more rainfall during 2016 monsoon than during 2015 monsoon. Geotechnical testing of the soil overlying the rockmass, corroborate the soil as 'soft soil' with compressive strength of 42 kPa and friction angle of 27.4 •. Granulometry confirms the soil as having >97% sand and silt size particles and <3% clay size particles, indicating higher permeability. Mineralogically, the soil dominantly constitutes quartz, muscovite and clinochore. Though no swelling clay minerals has been observed, the higher permeability and low strength of the soil, and concentrated higher rainfall during 2016 are the main causes for the landslide to occur. This landslide has partially blocked the flow of Kali river that serve as a boundary between India and Nepal and is endangering the habitants of the Khotila and Bangabagar villages, situated downstream in the Indian and Nepalese side of the Himalaya. In order to understand the stability of the slope, finite element modelling of the landslide has been carried out that points towards higher concentration of stresses in the landslide zone, indicating that there is further probability for the failure of landslide mass. It is therefore suggested that the landslide must be monitored continuously, particularly during the rainy season and also the risk posed by this landslide must be evaluated so as to avoid any further loss to life and infrastructure in the region.

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Non-convergence Criterion on Slope Stability FE Analysis by Strength Reduction Method

Cited by 13 publications

References 0 publications

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

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

Landslide Simulation Using Limit Equilibrium and Finite Element Method

Geological and geotechnical characterisation of the Khotila landslide in the Dharchula region, NE Kumaun Himalaya

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