Noncircular slip surface analysis of the stability of slopes. An application of dynamic programming to the Janbu method.

Yamagami, Takuo; Ueta, Yasuhiro

doi:10.3313/jls1964.22.4_8

Cited by 20 publications

(10 citation statements)

References 5 publications

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“…The simulated results of seepage analysis are used in this slope stability analysis, indicating that the results of water content are used to calculate the weight of each slice; the pressure head results are used to calculate the value of average pore-water pressure on the base of slices; and the results of negative pore-water pressure are used as previously noted. In addition, the dynamic programming method, which has been developed as a numerical algorithm for the rapid optimization of sequential multistage decision problems, is used to determine the critical slip surface with the lowest safety factor and is mainly based on research by Yamagami and Ueta (1986). The algorithm combines Janbu's simplified method with dynamic programming based on the ideas of Baker (1980).…”

Section: Calculation Of Mass Slidingmentioning

confidence: 99%

Numerical modelling of river embankment failure due to overtopping flow considering infiltration effects

Mizutani

Nakagawa

Yoden³

et al. 2013

Journal of Hydraulic Research

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This study conducted laboratory experiments and numerical simulations of river embankment failure due to overtopping flow with different sediment sizes and different saturation conditions of embankment body. The influences of saturation and sediment size of embankment materials on the erosion process were discussed based on the results of the laboratory experiments, and a numerical model was developed to simulate the erosion process of embankments by flow overtopping. The developed model introduced the effects of infiltration process and resisting shear stress due to suction of unsaturated sediment as a new expression. To simulate the embankment erosion phenomenon, the numerical model consisted of four modules: two-dimensional shallow-water flow, seepage flow, sediment transport using a non-equilibrium model framework, and two-dimensional slope stability. The reproducibility of the developed model was tested using experimental data on embankment erosion. The numerical results of progressive embankment erosion well agreed with the results of the sandy river embankment experiments.

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Section: Calculation Of Mass Slidingmentioning

confidence: 99%

Numerical modelling of river embankment failure due to overtopping flow considering infiltration effects

Mizutani

Nakagawa

Yoden³

et al. 2013

Journal of Hydraulic Research

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“…To determine the slip surface shape, it is necessary to search for the slip surface having the minimum safety factor. To this end, several algorithms have been proposed (e.g., Baker 1980;Yamagami and Ueta 1986). Slopes at water edges, such as riverbank slopes, tend to fail along a planar slip surface (Osman and Thorne 1988); therefore, their stabilities are typically analyzed by limiting the analysis to only planar slip failures.…”

Section: Searching For a Slip Surfacementioning

confidence: 99%

Numerical simulation method for predicting a flood hydrograph due to progressive failure of a landslide dam

et al. 2021

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Reducing the damage due to landslide dam failures requires the prediction of flood hydrographs. Although progressive failure is one of the main failure modes of landslide dams, no prediction method is available. This study develops a method for predicting progressive failure. The proposed method consists of the progressive failure model and overtopping erosion model. The progressive failure model can reproduce the collapse progression from a dam toe to predict the longitudinal dam shape and reservoir water level when the reservoir water overflows. The overtopping erosion model uses these predicted values as the new initial conditions and reproduces the dam erosion processes due to an overtopping flow in order to predict a flood hydrograph after the reservoir water overflows. The progressive failure model includes physical models representing the intermittent collapse of a dam slope, seepage flow in a dam, and surface flow on a dam slope. The intermittent collapse model characterizes the progressive failure model. It considers a stabilization effect whereby collapse deposits support a steep slope. This effect decreases as the collapse deposits are transported downstream. Such a consideration allows the model to express intermittent, not continuous, occurrences of collapses. Field experiments on the progressive failure of a landslide dam were conducted to validate the proposed method. The progressive failure model successfully reproduced the experimental results of the collapse progression from the dam toe. Using the value predicted by the progressive failure model, the overtopping erosion model successfully reproduced the flood hydrograph after the reservoir water started to overflow.

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“…On the other hand, the previously measured seismic peak acceleration was 0.22 g, and the average maximum acceleration in this article, which was defined as the ratio of dividing a period into the difference value between the absolute value of the positive and negative acceleration peaks, was 0.156 g. According to the "China Earthquake Peak Acceleration Zoning Map [29]" and "Response to the Earthquake Fortification Standard for the Reconstruction after Yushu Earthquake," the seismic intensity that was approved as an area to fortify against earthquakes by the state was defined as the seismic fortification intensity, which could be generally used as the seismic basic intensity. e seismic fortification intensity of the Yushu Earthquake was 7°, and the designed earthquake acceleration was 0.15 g. e simplified Bishop method [30], the strict Janbu method [31], the Spencer method [32], and the transfer coefficient method [33] were used to calculate the dynamic stability of the landslide body. e calculation results are shown in Table 4.…”

Section: Comparison and Validation With Previous Studiesmentioning

confidence: 99%

Study on Seismic Coefficient Calculation Method of Slope Seismic Stability Analysis

Pai

Wu²,

Yang

et al. 2021

Shock and Vibration

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In this paper, a pseudostatic seismic coefficient evaluation method for slope dynamic stability analysis was explored with Yushu Airport Road 3# landslide as a typical engineering case, and the shaking table test and numerical calculation were performed during the exploration. The loading waveform was selected as Yushu wave, and the acceleration time-history of seismic waves was measured and analyzed, revealing the failure mode of slopes. Based on the rigid-body limit equilibrium theory, the instantaneous additional seismic forces of each block and the time-history landslide stability coefficient were calculated. According to the time-history of the landslide, dynamic stability coefficients were calculated. Subsequently, we proposed a pseudostatic seismic coefficient evaluation method and discussed the seismic coefficient slope dynamic stability analysis. The results showed that as the vibration frequency rose, the average acceleration and the residual displacement of the slope decreased, but the slope grew more dynamically stable. With the proposed method, we calculated the period of slope seismic action to be 0.126 s and the average maximum acceleration to be 0.156 g, which was close to the designed ground motion acceleration of 0.15 g. Besides, we calculated the safety factor of landslides under earthquake to be 0.93∼0.97, which was close to that obtained from the building code method and in accordance with the present seismic deformation and failure mode of landslides. Moreover, the results obtained from the method of nuclear power plant specification were relatively small compared to other specification methods. The research is significant because it provides a new idea for the evaluation of seismic landslide stability in practical engineering.

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Noncircular slip surface analysis of the stability of slopes. An application of dynamic programming to the Janbu method.

Cited by 20 publications

References 5 publications

Numerical modelling of river embankment failure due to overtopping flow considering infiltration effects

Numerical modelling of river embankment failure due to overtopping flow considering infiltration effects

Numerical simulation method for predicting a flood hydrograph due to progressive failure of a landslide dam

Study on Seismic Coefficient Calculation Method of Slope Seismic Stability Analysis

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