A Comparative Study Between the NGI Direct Simple Shear Apparatus and the Mikasa Direct Shear Apparatus

Hanzawa, Hideo; Nutt, Nigel Robert Forbes; Lunne, Tom; Tang, Yi-Xin; Long, Michael

doi:10.3208/sandf.47.47

Cited by 25 publications

(12 citation statements)

References 21 publications

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“…From a comparison study performed by Hanzawa et al (2007) on Drammen and Ariake clays, it was found that the shearing properties measured by the direct shear apparatus are the same as those measured by the simple shear apparatus at the Norwegian Geotechnical Institute (NGI). In this study, the size and preparation of the specimens are the same as the CRS apparatus, i.e., 60 mm, and with a height of 10 to 20 mm.…”

Section: Testing Apparatus and Methodologymentioning

confidence: 99%

Influence of the Soil Fabric on the Mechanical Properties of Unsaturated Clays

Nikol

Tanaka

2011

Soils and Foundations

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To determine the properties of bentonite in an unsaturated condition, which is typically used in the initial placement of the clay liners in landˆlls, the eŠect of the soil fabric on the mechanical properties of unsaturated compacted Kunigel-V1, a bentonite clay, and NSF Clay, a non-swelling clay, were investigated. Samples were prepared at varying gravimetric water contents, ranging from natural to 70z, with the use of distilled water. The soil fabric was studied using scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). The mechanical behaviour was studied by constant rate of strain (CRS) consolidation testing and constant volume direct shear (CVDS) testing. The results indicate that while an increase in water content resulted in the formation of aggregates and an increase in shear strength, it was the dilatancy behaviour that was most aŠected. The saturation of Kunigel-V1 resulted in a decrease in the friction angle, from 40.49to 20.49 , while the saturation of NSF Clay resulted in a decrease in friction angle from over 409to 32.39 .

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Section: Testing Apparatus and Methodologymentioning

confidence: 99%

Influence of the Soil Fabric on the Mechanical Properties of Unsaturated Clays

Nikol

Tanaka

2011

Soils and Foundations

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“…This is generally accomplished by modifying the normal load during shearing either through an active control system (which adjusts the normal load on the specimen during shear in response to a measurement of specimen height -e.g., Taylor, 1952;O'Neil, 1962) or passive control system (which mechanically restrains the specimen height and measures changes in normal load with a load cell -Takada, 1993). Direct shear devices with these modifications have been shown to provide reasonable estimates of undrained strength from constant volume simple shear tests (e.g., Hanzawa et al, 2007). However, the emphasis of the present paper is on the relatively pragmatic question of whether an unmodified, conventional direct shear device can be operated to provide reasonable estimates of undrained strength.…”

Section: Introductionmentioning

confidence: 99%

Estimating Undrained Strength of Clays from Direct Shear Testing at Fast Displacement Rates

Bro¹,

Stewart²,

Pradel³

2013

Geo-Congress 2013

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“…Fig. 1 Conditions of (a) direct simple shear and (b) direct shear box [2] Direct simple shear test is more accurate than direct shear test and triaxial test [1]. Simple shear is in cylindrical shape.…”

Section: Hemic Peatmentioning

confidence: 99%

“…The direct simple shear test is a new improvement of direct shear box. Both devices will be applied shear directly to the soil specimen, but the direct shear test has inhomogeneity of the resultant strains and applied stress compare to direct simple shear test that can minimize them [2]. The shearing condition of direct simple shear and direct shear box are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Stress-Strain Behavior of Parit Nipah Peat

Mansor

Zainorabidin

2015

InCIEC 2014

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Stress can produce a deformation because real material is not rigid, the deformation will measure the strain. Stress-strain is important in determining peat behaviour. Peat cannot support too much load on it because of peat have very low strength, high compressibility and long-term settlement. The objective of this study is to determine the behaviour of stress-strain characteristic using different test. The undisturbed samples were collected at Parit Nipah, Batu Pahat, Johore, Malaysia. The tests are direct simple shear and direct shear box. These methods cover the determination of the stress-strain relationship of peat and to investigate the behaviour of peat. Normal stresses are 12.5, 25, 50 and 100 kPa with 0.1 mm/min rate of shear. This study is to know the stress-strain between direct simple shear test and direct shear test based on peat specimens of hemic. The test results will contribute and establish the drained shear characteristic of testing peat. It shows that direct simple shear test stress-strain is increasing clearly than direct shear test. Besides that, direct simple shear is suitable to use on peat soil rather than direct shear box. This research can help the geotechnical engineers and can be used in the development of foundation and as well as constructions.

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A Comparative Study Between the NGI Direct Simple Shear Apparatus and the Mikasa Direct Shear Apparatus

Cited by 25 publications

References 21 publications

Influence of the Soil Fabric on the Mechanical Properties of Unsaturated Clays

Influence of the Soil Fabric on the Mechanical Properties of Unsaturated Clays

Estimating Undrained Strength of Clays from Direct Shear Testing at Fast Displacement Rates

Stress-Strain Behavior of Parit Nipah Peat

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