Effects of horizontal drains on slope stability under rainfall by three-dimensional finite element analysis

Cai, Fei; Ugai, Keizo; Wakai, Akihiko; Li, Q.

doi:10.1016/s0266-352x(98)00021-4

Cited by 99 publications

(38 citation statements)

References 23 publications

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“…These two constitutive relationships generally exhibit considerable spatial variability, and are very time consuming, labor intensive, and costly to measure at the scale of a hillslope [22,23]. Whereas several authors have investigated the effect of the saturated hydraulic conductivity on slope (in) stability [12,[24][25][26], relatively few contributions in the geotechnical literature have explored properly the coordinated impact of SWCC and HCF uncertainty on the SF values derived from slope stability studies [4,6,18,27]. We agree wholeheartedly with Liang and Uchida [23] that a detailed characterization of the temporal and spatial variability of the moisture content of the soil mantle is warranted in slope stability studies.…”

Section: Introductionmentioning

confidence: 99%

The role of uncertainty in bedrock depth and hydraulic properties on the stability of a variably-saturated slope

Gomes

Vrugt

Vargas

et al. 2017

Computers and Geotechnics

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a b s t r a c tWe investigate the uncertainty in bedrock depth and soil hydraulic parameters on the stability of a variably-saturated slope in Rio de Janeiro, Brazil. We couple Monte Carlo simulation of a threedimensional flow model with numerical limit analysis to calculate confidence intervals of the safety factor using a 22-day rainfall record. We evaluate the marginal and joint impact of bedrock depth and soil hydraulic uncertainty. The mean safety factor and its 95% confidence interval evolve rapidly in response to the storm events. Explicit recognition of uncertainty in the hydraulic properties and depth to bedrock increases significantly the probability of failure.

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Section: Introductionmentioning

confidence: 99%

The role of uncertainty in bedrock depth and hydraulic properties on the stability of a variably-saturated slope

Gomes

Vrugt

Vargas

et al. 2017

Computers and Geotechnics

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“…The portion of the slope above the drain appears to benefit further from the stabilizing influence of the drain compare to the lower portion below the drain. However, in actual situations, this effect is mainly controlled by the vertical spacing and dimension of the drains (Cai et al 1998). Also, it can be concluded from Fig.…”

Section: Slopes With No Drainmentioning

confidence: 85%

“…Therefore, the most vulnerable portion of a slope for surficial instability is where water is emerging from the slope, i.e., the discharge area. In these situations, where groundwater appears to be a major detrimental factor on the stability, horizontal drains have proved to be a cost-effective and viable measure in preventing and correcting the failure (Smith and Stafford 1955;Tong and Maher 1975;Kenney et al 1977;Barrett 1980;Ruff 1980;Nonveiller 1981;Chan 1987;Singer 1990;Whiteside 1997;Cai et al 1998;Rahardjo et al 2003). They act effectively only when the ground is sufficiently permeable to allow drainage.…”

Section: Slopes With No Drainmentioning

confidence: 99%

Stability of sandy slopes under seepage conditions

Ghiassian

Ghareh

2008

Landslides

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Stability against shallow mass sliding in saturated sandy slopes under seepage depends on the flow direction and hydraulic gradient, particularly near the ground surface. Two modes of instability i.e., Coulomb sliding and liquefaction have been studied and the critical flow directions discussed. The utility of the numerical approach in solving complex flow problems with irregular boundaries and surface topography is demonstrated by means of two slope examples with different internal drainage conditions. The numerical results for the seepage gradients at different points are compared with those predicted by the simple expression derived in this study, and the corresponding effects on the stability are evaluated.

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“…Horizontal drains reduce the pore pressure on the slip surface while the drainage rate increases with increasing the length of the drains [23]. The horizontal drains length is far more effective than the spacing between them, the minimum length is 22.5 m [21,24]. The best place for installing horizontal drains is at the toe of the slope [21,22].…”

Section: Introductionmentioning

confidence: 99%

The Rise of Groundwater Due to Rainfall and the Control of Landslide by Zero-Energy Groundwater Withdrawal System

Alsubal¹,

Sapari²,

Harahap³

2018

IJET

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Slope failure is a common issue in tropical countries. The rise of groundwater table due to rainfall is one of the main triggering factors. There are several methods for slope stabilization such as soil nailing, retaining walls, cut and fill, vegetation and so on. Most of those methods are costly and we are in need for stabilizing methods that are more economical and easier to construct. This article introduces a new method for slope stability. This method is examined numerically and experimentally. It is represented in an automatic zero-energy groundwater withdrawal system to enhance slope stability. The system is validated in a pre-fabricated model to ensure that it works on natural soil slope. The numerical simulation is performed in Soilworks software with coupled seepage-slope stability analysis using finite element methods to check the safety factor with and without the system. The effectiveness of this method is investigated with various rainfall intensities and soil permeabilities. The results for slopes with the application of groundwater withdrawal system are compared with the results without the system. The results demonstrate the effectiveness of the proposed method in reducing groundwater table and enhancing slope stability. The factor of safety for the slope with high soil permeability drops from 1.312 before the rainfall to 1.292 and 0.93 after the third rainfall event for the slope with and without pumping groundwater respectively. For soil slope with moderate soil permeability, the factor of safety deteriorates from 1.314 to 1.157 at the end of the third day, while it remains stable with pumping groundwater. Matric suction is highly increased at the crest of the slope due to pumping.

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Effects of horizontal drains on slope stability under rainfall by three-dimensional finite element analysis

Cited by 99 publications

References 23 publications

The role of uncertainty in bedrock depth and hydraulic properties on the stability of a variably-saturated slope

The role of uncertainty in bedrock depth and hydraulic properties on the stability of a variably-saturated slope

Stability of sandy slopes under seepage conditions

The Rise of Groundwater Due to Rainfall and the Control of Landslide by Zero-Energy Groundwater Withdrawal System

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