Modeling of suction distributions in an unsaturated heterogeneous residual soil slope

Kassim, Anuar; Gofar, Nurly; Lee, Min Lee; Rahardjo, Harianto

doi:10.1016/j.enggeo.2012.02.005

Cited by 40 publications

(18 citation statements)

References 31 publications

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“…Similarly, the variation in the permeability due to the arrangements of the relict joint diminishes when the spacing increases. Furthermore, increasing the spacing between the relict joints indicates the samples almost replicate the homogeneous soil hence the permeability remained the same [3]. For one relict joint, Part 1 is for spacing less than 100 mm, Part 2 for spacing greater than 100 mm but less than 300 mm and Part 3 for spacing greater than 300 mm.…”

Section: Resultsmentioning

confidence: 99%

“…The difference in permeability between these two layers is more pronounced when relict joint appears in the saprolitic layer. Kassim et al [3] have proven that increasing the number of relict joint, increases the permeability of the soil. Previous studies such as [9][10][11] have shown that a relationship exist between soil discontinuity and suction distribution in residual soil.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have shown that rainfall infiltration increases the soil water content which decreases matric suction and hence decreases the additional shear strength provided by the matric suction which results in landslides [1][2][3][4]. One of the factors that contribute to this phenomena is heterogeneity in the residual soil which greatly affects the permeability of the soil [3]. Residual soil is the final product of in-situ weathering process whether mechanical or chemical weathering of rock.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Relict Joints on Permeability of Residual Soil

Talib

Kassim

Yunusa

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Weathering process of granitic material results in the formation of relict joint in lateritic layer of the weathering profile. The number and arrangements of the relict joints affects the permeability of the residual soil which invariably affects water flow and suction distribution in the residual soil. Although the permeability of residual soil without a relict joint can be determined using standard permeability test, it is difficult to be measured when a relict joint is incorporated due to limitation of size and area of the standard equipment. Hence, modified permeability test equipment is introduced in this study. Two arrangement of the relict joint in the equipment were considered. In the first arrangement one relict joint with various spacing were tested while the orientation and spacing of the relict joint were tested using two relict joints in the second arrangement. The results obtained shows that the permeability of the residual soil due to one and two relict joint varies by two orders of magnitude. Therefore, the number and spacing of relict joints modified the permeability of residual soil.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Relict Joints on Permeability of Residual Soil

Talib

Kassim

Yunusa

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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“…These hydraulic properties were assumed to be isotropic. Previous researches (Jiao et al 2005 andKassim et al 2012) showed that this approximation is acceptable and useful to investigate the hydrological response of slope to rainfall. Table 3 shows the saturated hydraulic conductivity used in the model.…”

Section: Model Configuration and Hydraulic Parametersmentioning

confidence: 94%

Implication of subsurface flow on rainfall-induced landslide: a case study

Dai

Wei

et al. 2015

Landslides

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Post-failure field investigation, instrumentation, monitoring, and numerical simulation were performed to give insights into the failure mechanism of a 13-h-delayed rainfall-induced landslide. A conceptual hydrological model was postulated based on the findings obtained from the investigation works. The results showed that subsurface flow was recharged by intense and prolonged rainfall through outcrops of fissured bedrock. The recharged water was mounded in the moderately weathered granite layer and caused an increase in hydraulic head. The groundwater seeped gradually upward into the overlying fill layer even after the rain has ceased, and eventually triggered the landslide when the water table was raised to a critical state. As most of the existing hydrologic-slope stability models were developed on the basis of soil-impermeable bedrock model, this could result in great discrepancies between the simulated results and the real hydrological responses of the slope. The findings from the present study highlighted the importance of considering subsurface flow and hydro-geological features in assessing the mechanism of rainfallinduced landslide.

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“…The soil properties are taken from the lab experiments for soil case studies located in Malaysia and reported by [32] at University Technology Malaysia, Skudai Campus, namely Bukit Cerapan. Table 1 shows the physical properties of the soil.…”

Section: Soil Propertiesmentioning

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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Modeling of suction distributions in an unsaturated heterogeneous residual soil slope

Cited by 40 publications

References 31 publications

Influence of Relict Joints on Permeability of Residual Soil

Influence of Relict Joints on Permeability of Residual Soil

Implication of subsurface flow on rainfall-induced landslide: a case study

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

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