Factors Controlling Instability of Homogeneous Soil Slopes under Rainfall

Rahardjo, Harianto; Ong, T. H.; Rezaur, R. B.; Leong, Eng Choon

doi:10.1061/(asce)1090-0241(2007)133:12(1532)

Cited by 313 publications

(206 citation statements)

References 9 publications

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“…The boundary conditions were set according to field observations on the landslide area and the boundary conditions used by Rahardjo et al (2007). The non-saturated transient flux results were obtained for two cases considering only the accumulated rainfall and rainfall with linear leakage along the cut slope (Fig.…”

Section: Modelling Experimentsmentioning

confidence: 99%

Understanding shallow landslides in Campos do Jordão municipality – Brazil: disentangling the anthropic effects from natural causes in the disaster of 2000

Mendes

Andrade

Tomasella

et al. 2018

Nat. Hazards Earth Syst. Sci.

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Abstract. Located in a mountainous area of south-eastern Brazil, the municipality of Campos do Jordão has been hit by several landslides in recent history. Among those events, the landslides of early 2000 were significant in terms of the number of deaths (10), the population affected and the destruction of infrastructure that was caused. The purpose of this study is to assess the relative contribution of natural and human factors to triggering the landslides of the 2000 event. To achieve this goal, a detailed geotechnical survey was conducted in three representative slopes of the area to obtain geotechnical parameters needed for slope stability analysis. Then, a set of numerical experiments with GEO-SLOPE software was designed, including separate natural and anthropic factors. Results showed that natural factors, that is, high-intensity rainfall and geotechnical conditions, were not severe enough to trigger landslides in the study area and that human disturbance was entirely responsible for the landslide events of 2000. Since the anthropic effects used in the simulations are typical of hazardous urban areas in Brazil, we concluded that the implementation of public policies that constrain the occupation of landslide susceptible areas are urgently needed.

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Section: Modelling Experimentsmentioning

confidence: 99%

Understanding shallow landslides in Campos do Jordão municipality – Brazil: disentangling the anthropic effects from natural causes in the disaster of 2000

Mendes

Andrade

Tomasella

et al. 2018

Nat. Hazards Earth Syst. Sci.

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“…The contribution of other topographic parameters, like plan shapes and profile curvatures, was disregarded in the analyses since they fall within the three basic parameters along hillslope profile, and display their role on hillslope instability depending on local conditions of the basic parameters. Apart from the basic parameters, the major parameters of subsurface hydrologic response to rainfall (i.e., soil permeability and porosity) (Tsaparas et al 2002;Rahardjo et al 2007;Dahal et al 2009) were included in transient hydrological modelling. In this regard, it is anticipated that the results and findings obtained from two-dimensional numerical modelling in this study should not deviate importantly from the actual hydro-mechanical phenomena in topographic hollows.…”

Section: Discussionmentioning

confidence: 99%

“…To understand the discharge of hillslope seepage and to investigate the potentiality of failure during rainfall, coupled SEEP/W-SLOPE/W models (Krahn 2004a(Krahn , 2004b have been increasingly used (Anderson et al 2000;Rahardjo et al 2007;Dahal et al 2009;Lee et al 2009;Schnellmann et al 2010;Muntohar & Liao 2010;Rahimi et al 2010). SEEP/W is a finite element-based programme in GeoStudio (2005) which simulates porewater pressure distribution in natural slopes.…”

Section: Two-dimensional Programme Selectionmentioning

confidence: 99%

Seepage and slope stability modelling of rainfall-induced slope failures in topographic hollows

Acharya

Bhandary

Dahal

et al. 2014

Geomatics, Natural Hazards and Risk

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This study focuses on topographic hollows, their flow direction and flow accumulation characteristics, and highlights discharge of hillslope seepage so as to understand porewater pressure development phenomena in relation with slope failure in topographic hollows. For this purpose, a small catchment in Niihama city of Shikoku Island in western Japan, with a record of seven slope failures triggered by typhoon-caused heavy rainfall on 19À20 October 2004, was selected. After extensive fieldwork and computation of hydro-mechanical parameters in unsaturated and saturated conditions through a series of laboratory experiments, seepage and slope stability modellings of these slope failures were done in GeoStudio environment using the precipitation data of 19À20 October 2004. The results of seepage modelling showed that the porewater pressure was rapid transient in silty sand, and the maximum porewater pressure measured in an area close to the base of topographic hollows was found to be higher with bigger topographic hollows. Furthermore, a threshold relationship between the topographic hollow area and maximum porewater pressure in this study indicates that a topographic hollow of 1000 sq. m area can develop maximum porewater pressure of 1.253 kPa. However, the porewater pressures required to initiate slope instability in the upper part of the topographic hollows is relatively smaller than those in the lower part of the topographic hollows.

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“…SWCC and permeability f soil properties used in the defo The SWCC and permeability was based on [18] to represen soil (f 10,-4 ). The SWCC was p and Xing (1994) with c( permeability function was ba and permeability function of th Fig.…”

Section: Materials Propertiesmentioning

confidence: 99%

Saturated and unsaturated stability analysis of slope subjected to rainfall infiltration

Gofar

Rahardjo

2017

MATEC Web Conf.

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Abstract.This paper presents results of saturated and unsaturated stability analysis of typical residual slopes subjected to rainfall infiltration corresponds to 50 years rainfall return period. The slope angles considered were 45 o and 70 o . The saturated stability analyses were carried out for original and critical ground water level commonly considered by practicing engineer. The analyses were conducted using limit equilibrium method. Unsaturated stability analyses used combination of coupled stress-pore-water pressure analysis to evaluate the effect of rainfall infiltration on the deformation and transient pore-water pressure on slope stability. Slope stability analyses were performed at some times during and after rainfall infiltration. Results show that the critical condition for slope made by sandy material was at the end of rainfall while for clayey material was at some specified times after the rainfall ceased. Unsaturated stability analysis on sandy soil gives higher factor of safety because the soil never reached saturation. Transient analysis using unsaturated soil concept could predict more critical condition of delayed failure of slopes made up of clayey soil.

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Factors Controlling Instability of Homogeneous Soil Slopes under Rainfall

Cited by 313 publications

References 9 publications

Understanding shallow landslides in Campos do Jordão municipality – Brazil: disentangling the anthropic effects from natural causes in the disaster of 2000

Understanding shallow landslides in Campos do Jordão municipality – Brazil: disentangling the anthropic effects from natural causes in the disaster of 2000

Seepage and slope stability modelling of rainfall-induced slope failures in topographic hollows

Saturated and unsaturated stability analysis of slope subjected to rainfall infiltration

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