Comparative analysis of limit equilibrium and numerical methods for prediction of a landslide

Kumar, Nagendra; Verma, A. K.; Sardana, Sahil; Sarkar, Kripamoy; Singh, T. N.

doi:10.1007/s10064-017-1183-4

Cited by 46 publications

(19 citation statements)

References 21 publications

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“…Rock mass that was indicated good or fair by RMR, it became normal or bad when the discontinuity orientations with respect to slope face are taken into sum of core pieces ≥ 10 cm x 100 total drill run RQD = .............1 equilibrium approach combines strength parameters, slope and discontinuity characteristics (Kumar et al, 2017). Switching from stability to failure may be envisaged mathematically as a decrease in the factor of safety to values below unity.…”

Section: Rock Mass Classificationmentioning

confidence: 99%

Stability evaluation of hazardous translational slide zones in part of Yamunotri Pilgrimage route, National Highway 507, Uttarakhand, India

Bhatta¹,

Dudeja²,

Biyani³

2021

Journal of Nepal Geological Society

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Slope failure is a widespread phenomenon in Lesser Himalaya owing to its fragile tectonic settings, rugged topography, high relief, abruptly varying gentle to steep slopes and peculiar climatic conditions. Road development and urban expansion have further deteriorated the slope conditions. National Highway 507, a part of the pilgrimage route to Yamunotri in Uttarakhand, is one such route, experiencing hostility from frequent slope failure episodes that are causing havoc for villagers and pilgrims. In the present study, the four most hazardous translational slide zones in the 22 km stretch from Judo to Kandi village in the Yamunotri pilgrimage route has been identified, for detailed geotechnical investigation and slope stability assessment applying different approaches. The rock masses of this region are inherently weak owing to their closeness to Aglar fault and other joints and fractures. Rock mass classification systems are used to assess the stability and for estimating strength parameters, viz. cohesion and angle of internal friction, essential for the factor of safety determination. They are slightly varying due to the relatively homogeneous grain size distribution and mineralogical composition of rock masses. Kinematic Analysis differentiated the type of failure as planar or wedge and, accordingly, factor of safety is determined by limit equilibrium approach. The factor of safety, computed strength parameters, discontinuity and slope properties, varies from 5.9 to 1.1 in dry conditions while it reduces below unity as the saturation upsurges. It depicts stable conditions in dry conditions but water penetration and saturation along the cracks and discontinuities during rainfall make them unstable. Close vicinity with fault, steep slope, presence of joints and weathered lithology are dominating factors initiating the instability in route with further aggravation by rainfall, road widening and urban expansion.

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Section: Rock Mass Classificationmentioning

confidence: 99%

Stability evaluation of hazardous translational slide zones in part of Yamunotri Pilgrimage route, National Highway 507, Uttarakhand, India

Bhatta¹,

Dudeja²,

Biyani³

2021

Journal of Nepal Geological Society

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“…Meanwhile, stress increment (Δσ 3 ) required for each unit is calculated in FLAC 3D for each element based on equation (5). en, the anchoring force P of the single anchor can be obtained as follows:…”

Section: Quantitative Reinforcement Designmentioning

confidence: 99%

“…e stability analysis and reinforcement are therefore compulsory for the loess slope. e traditional methods used in the slope stability analysis include the limit equilibrium method [2][3][4][5][6], the strength reduction method [7,8], and the reliability-based method [9,10]. Moreover, Verma et al [11] built a coupled finite element method (FEM) and artificial neural network (ANN) model to predict the factor of safety of the slope.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Reinforcement Analysis of Loess Slope with Anisotropy

Shi

Wang

Yuan

et al. 2019

Advances in Civil Engineering

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The loess slope in east Gansu presents a large degree of anisotropy which should be considered both in the slope stability analysis and in the reinforcement design. To investigate the mechanical anisotropy presented in the loess soil, the undisturbed loess specimens are taken from the field with different sampling directions (α, defined as the angle between the normal direction of specimen and sedimentation direction). The direct shear tests are conducted on specimens of different α, and it is found that the anisotropy has slight influence on the friction angle (φ), while the specimen with α=0° presents the smallest cohesion and the specimen with α=90° has the largest cohesion. The anisotropy behaviors have also been observed from the one-dimensional consolidation test and tension test. After that, the principle of point safety factor and the degree of reinforcement demand are introduced, and the method of quantitative reinforcement of anisotropic loess slope is proposed. The proposed approach is then implemented in the Fast Lagrangian Analysis of Continua in 3D (FLAC3D), and the point safety factor and the degree of reinforcement demand are investigated on slope with different slope ratios. It is found that the proposed approach could effectively be used to analyze the slope involving anisotropy through the comparison with the conventional limit equilibrium method. Meanwhile, the reinforcement zone and the reinforcement demanding of anisotropy slope are obtained, and relevant reinforcement design in practice is proposed.

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“…Instability in the rock slopes is frequently increased by freeze-thaw (FT) activity due to the climate change cycle occur in cold regions. Most of the Indian Himalayan region slopes are unstable and come under the avalanche-prone area (Verma et al, 2021;Kumar et al, 2018). The slope failure can lead to fatalities, injuries and damages to infrastructures (Sardana et al 2020;2019a, b).…”

Section: Introductionmentioning

confidence: 99%

Influence of Freeze-Thaw on the Stability of Road Cut Slopes near Atal Tunnel in Indian Himalayan Region

Sardana

Sinha

Verma

et al. 2021

Preprint

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The rock slopes in the Indian Himalayan region are exposed to recurrent freeze-thaw. Freeze-thaw plays a dominant role in the instability of rock slopes in cold regions. Extensive field investigations have been carried on the two rock slopes of the Solang valley roadway in Himachal Pradesh. Freeze-thaw testing has been carried out in the laboratory on the rock samples collected from the studied slopes. The test has been repeated for 30 freeze-thaw cycles. The laboratory tests have been conducted to determine the mechanical properties of rock with and without freeze-thaw conditioning. The micro-photographs from scanning electron microscope have been obtained to identify the microscopic damages due to freeze-thaw activity. The macroscopic damages have been recognized in tensile, compressive and triaxial compressive strength of rock. Further, a three-dimensional numerical analysis has been performed to evaluate the stability and corroborate the results with the field observations. FT conditioning results reveal a reduction of about 27–39 % in rock strength and subsequently a decrease in the factor of safety by 10–39 % for rock slopes.

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Comparative analysis of limit equilibrium and numerical methods for prediction of a landslide

Cited by 46 publications

References 21 publications

Stability evaluation of hazardous translational slide zones in part of Yamunotri Pilgrimage route, National Highway 507, Uttarakhand, India

Stability evaluation of hazardous translational slide zones in part of Yamunotri Pilgrimage route, National Highway 507, Uttarakhand, India

Quantitative Reinforcement Analysis of Loess Slope with Anisotropy

Influence of Freeze-Thaw on the Stability of Road Cut Slopes near Atal Tunnel in Indian Himalayan Region

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