Numerical Analysis of Rainfall Effects on Slope Stability

Cai, Fei; Ugai, Keizo

doi:10.1061/(asce)1532-3641(2004)4:2(69)

Cited by 263 publications

(98 citation statements)

References 28 publications

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“…As noted in previous investigations of unsaturated fluid flow in slope engineering [1,2,25], rainfall infiltration will increase the water pressure inside the rocks and fractures and weaken the rock strength parameters; the landslide often occurs in the rain season. And the analysis of the fractured rock slope has been employed to demonstrate the capacity and robustness of the proposed coupled model for describing the rainfall infiltrating process influencing the slope water pressure, displacement, and stress distribution.…”

Section: Analysis Of a Fractured Rock Slope Considering Rainfall Infimentioning

confidence: 81%

“…And the corresponding prediction and description of deformation, stress, and groundwater flow in the fractured rocks are of interest in many geotechnical areas such as slope stability [1,2] and seepage control for hydraulic projects [3,4]. However, different from the general porous media, the permeability of intact rock is very low compared with that in fractures [5]; water flows predominantly through a single fracture or fracture networks [6]; it is more complex to describe the seepage behavior in such rocks.…”

Section: Introductionmentioning

confidence: 99%

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The Unsaturated Hydromechanical Coupling Model of Rock Slope Considering Rainfall Infiltration Using DDA

Liu

2017

Geofluids

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Water flow and hydromechanical coupling process in fractured rocks is more different from that in general porous media because of heterogeneous spatial fractures and possible fracture-dominated flow; a saturated-unsaturated hydromechanical coupling model using a discontinuous deformation analysis (DDA) similar to FEM and DEM was employed to analyze water movement in saturated-unsaturated deformed rocks, in which the Van-Genuchten model differently treated the rock and fractures permeable properties to describe the constitutive relationships. The calibrating results for the dam foundation indicated the validation and feasibility of the proposed model and are also in good agreement with the calculations based on DEM still demonstrating its superiority. And then, the rainfall infiltration in a reservoir rock slope was detailedly investigated to describe the water pressure on the fault surface and inside the rocks, displacement, and stress distribution under hydromechanical coupling conditions and uncoupling conditions. It was observed that greater rainfall intensity and longer rainfall time resulted in lower stability of the rock slope, and larger difference was very obvious between the hydromechanical coupling condition and uncoupling condition, demonstrating that rainfall intensity, rainfall time, and hydromechanical coupling effect had great influence on the saturatedunsaturated water flow behavior and mechanical response of the fractured rock slopes.

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Section: Analysis Of a Fractured Rock Slope Considering Rainfall Infimentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

The Unsaturated Hydromechanical Coupling Model of Rock Slope Considering Rainfall Infiltration Using DDA

Liu

2017

Geofluids

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“…7). All samples were subjected to the same small vertical stress of 0.83 N/cm 2 .hearing of the sample took place with two equal halves of the shearbox sliding horizontally in opposite directions (Fig. 6).…”

Section: 1proof Of Concept: Improved Shear Resistancementioning

confidence: 99%

“…The increased self-weight of the saturated soil would create additional stresses which can lead to slope instability. Some examples of past work on the rain water seepage on slope stability have been reported by Cai&Ugai [2], Dahal et al [3], Deepa & Viswanadham [4], Guan et al [5] as well as Raj & Sengupta [6].…”

Section: Introductionmentioning

confidence: 98%

Screw-in Soil Nail for Slope Reinforcement Against Slip Failure: A Lab-Based Model Study

Chan¹

2017

geomate

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Slope failures occur when the shear resistance along the slip plane is exceeded. This can be caused by excessive load imposed at the slope crest or compromised stability of the slope, e.g. disturbed dimensions of the slope. In order to prevent slope failure, stabilisation or reinforcement measures need to be taken. A common solution is to intercept the slope failure plane with reinforcement elements, such as soil nails and ground anchors. In soil nailing, reinforcement bars are installed on the slope to effectively resist the additional shear forces from the imposed loads, hence reducing the probability of failure in the long run. This paper describes the innovation of soil nail with screw-in installation mechanism instead of the conventional push-in approach. The screw-in installation ensures better soil-nail grip and less disturbance during the slope stabilisation procedure, especially in terms of noise and spoils. In addition, the novel nail has a hollow stem which improves shear resistance with greater soil-nail surface contact on the inner wall. The opening at the nail head also enables displaced air to escape as the nail is screwed into the slope and soil pushed into the inner hollow cavity. The prototype nails were tested in a slope model with different configurations, and were found to reduce the Angular Distortion Ratio by 37 % and the Volumetric Deformation Index as much as 33 % respectively. The novel screw-in soil nail could be potentially used to stabilize natural and man-made slopes, though full-scale simulations are recommended to formulate the installation procedure and to validate the effectiveness.

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“…Alternatively, a finite-element method with the shear strength reduction technique (Cai and Ugai, 2004) can be used to obtain the safety factor of the slope, which is equal to the shear strength reduction factor just before the elasto-plastic finite-element analysis is unable to converge within a user-specified number of iterations.…”

Section: Coupled Hydro-mechanical Analysismentioning

confidence: 99%

Stability analysis of rainfall-induced slope failure: a review

Zhang

et al. 2011

Proceedings of the Institution of Civil Engineers - Geotechnica

261

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Rainfall is one of the most significant triggering factors for slope failures in many regions around the world.Numerous research studies have been conducted to investigate infiltration of rainwater into a slope, and the effect of water infiltration on slope stability. In this paper, a review of existing research on infiltration analysis and slope stability analysis under rainfall infiltration is presented. Studies on infiltration analysis with conceptual models, analytical analysis and numerical modelling are first reviewed. The typical pore water pressure profiles in the slope are then discussed. Subsequently, recent developments in analyses of slope instabilities under rainfall conditions using the limit equilibrium method and coupled hydro-mechanical modelling are summarised, and major findings on critical hydrological factors related to rainfall-induced landslides are summarised and discussed. Finally, several research topics are suggested for further study.

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Numerical Analysis of Rainfall Effects on Slope Stability

Cited by 263 publications

References 28 publications

The Unsaturated Hydromechanical Coupling Model of Rock Slope Considering Rainfall Infiltration Using DDA

The Unsaturated Hydromechanical Coupling Model of Rock Slope Considering Rainfall Infiltration Using DDA

Screw-in Soil Nail for Slope Reinforcement Against Slip Failure: A Lab-Based Model Study

Stability analysis of rainfall-induced slope failure: a review

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