Shear strength characteristics of two saprolitic soils

Gan, Julian; Fredlund, D.G.

doi:10.1139/cgj-33-4-595

Cited by 12 publications

(15 citation statements)

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“…Equation 2 avoids the use of fitting parameters developed by Fredlund and Xing (1994) to obtain ⏀ b and allows for more parameters to be obtained from the SWCC. Gan and Fredlund (1996) studied the saturated and unsaturated shear strength properties of two saprolitic soils using direct shear tests and triaxial tests and reported that the relationship between matric suction and shear strength takes on a nonlinear form. They observed that the extent of increase in shear strength with matric suction is related to the SWCC and the amount of dilation occurring during shear.…”

Section: Soil Water Characteristic Curvesmentioning

confidence: 99%

Characterisation of unsaturated geotechnical properties of filtered magnetite tailings in a dry stack facility

Amoah¹,

Dressel²,

Fourie³

2018

Proceedings of the 21st International Seminar on Paste and Thickened Tailings

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Filtered tailings and dry stacking are gaining attention due to problems with slurry-deposited tailings facilities and consequent catastrophic failures around the world. Factors such as recent technological advancements in filtration, lack of water, regulatory pressures and societal demands are shifting focus towards dry stacking. With the growing attention to filtered tailings, a major challenge is the knowledge gap on unsaturated soil properties required to understand the performance of unsaturated tailings in the dry stack facility, especially the hydraulic and shear strength behaviours. This paper presents details of investigations to characterise unsaturated properties of filtered tailings material in a large-scale dry stack facility located in a highly net positive evaporation area in Western Australia. Field and laboratory tests were conducted to understand (i) hydraulic and water retention/storage functions, and (ii) shear strength responses to relevant stress state variables. Historical cone penetration tests with pore pressure measurements (CPTus) conducted annually between 2013 and 2017 consistently indicate negative pore pressures within the dry stack up to 25 m depth.

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Section: Soil Water Characteristic Curvesmentioning

confidence: 99%

Characterisation of unsaturated geotechnical properties of filtered magnetite tailings in a dry stack facility

Amoah¹,

Dressel²,

Fourie³

2018

Proceedings of the 21st International Seminar on Paste and Thickened Tailings

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“…A nonlinear trend was obtained for the SML tests, while a nearly linear trend was obtained for the QML tests. However, the large background of laboratory test results has demonstrated that shear strength of different soils increases nonlinearly with matric suction (Delage et al 1987;Escario and Saez 1987;Gan and Fredlund 1995;Teixeira and Vilar 1997). Therefore, a potential function was used to fit the failure stress results as a function of matric suction.…”

Section: Bearing Capacity Analysismentioning

confidence: 99%

Influence of Matric Suction on the Results of Plate Load Tests Performed on a Lateritic Soil Deposit

Suits¹,

Sheahan²,

Costa

et al. 2003

Geotechnical Testing Journal

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The performance of foundation systems on unsaturated soil deposits is considerably influenced by variations of the negative pore-water pressure (i.e., matric suction) distribution within the soil mass due to local microclimate conditions. Although significant understanding has been gained in the last few decades on the behavior of unsaturated soils, the use of unsaturated soil mechanics concepts in the interpretation of field tests has not been incorporated into the state-of-practice. As a consequence, conservative foundation engineering principles are used in practice in regions where unsaturated soil conditions prevail. For example, direct use of field test results (e.g., from plate load tests) obtained during a dry season in unsaturated soil deposits may lead to the selection of unconservatively high design parameters at the site. On the other hand, ignoring altogether the beneficial impact of matric suction on the bearing capacity of soils may lead to unnecessarily expensive foundation systems in tropical, arid climates. This paper investigates the influence of soil suction on the results of plate load tests conducted at a depth of 1.5 m on a structured, naturally occurring lateritic soil. Ten tests were carried out under different soil suction conditions. Matric suction was monitored during plate load testing using tensiometers installed at the bottom of the testing pit up to a depth equal to one plate diameter (0.80 m), which is generally recognized as the influence zone in which significant stress variation occurs (Terzaghi and Peck 1948). The results provide insight into the influence of soil matric suction on ultimate bearing capacity and settlement rate of plate load tests performed on lateritic soils.

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“…Ainda segundo Fredlund et al (1987), para baixos valores de sucção matricial, tem-se aproximadamente φ b =φ' . Gan & Fredlund (1995) apresentam resultados de ensaios triaxiais e de cisalhamento direto realizados em dois solos saprolíticos, ambos possuindo importantes vínculos inter partículas, ensaiados em condições saturadas e com sucção matricial controlada. Os resultados apresentados em termos de resistência ao cisalhamento de pico apresentam uma envoltória curvilínea para baixos valores de tensão normal e linear para altos valores.…”

Section: Técnica De Duas Alturas De Cargaunclassified

Análise de ruptura de talude em solo não saturado

Calle¹,

Antonio²

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Shear strength characteristics of two saprolitic soils

Cited by 12 publications

References 0 publications

Characterisation of unsaturated geotechnical properties of filtered magnetite tailings in a dry stack facility

Characterisation of unsaturated geotechnical properties of filtered magnetite tailings in a dry stack facility

Influence of Matric Suction on the Results of Plate Load Tests Performed on a Lateritic Soil Deposit

Análise de ruptura de talude em solo não saturado

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