Application of Multistage Triaxial Test to Kuwaiti Soils

Saeedy, Hamed S.; Mollah, M. A.

doi:10.1520/stp29087s

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…The most common termination point is the one where the shear stress reaches its peak (Ho & Fredlund, ; Kenny & Watson, ; Kim & Ko, ; Kovari et al, ). The strength parameters obtained using the peak point criterion have good agreement with those from the single‐stage test, particularly for insensitive soils (Gullic, ; Saeedy & Mollah, ). On the other hand, the shearing termination at peak point causes irreversible failures in brittle rocks and cemented soils, thereby leading to the reduced material strengths at the intermediate and final stages as compared to those from the single‐stage tests (Kim & Ko, ; Taheri et al, ).…”

Section: Introductionmentioning

confidence: 76%

“…Previous studies of multistage triaxial tests on sands have shown that the stress (applied up to peak) and strain history in earlier stages can affect the stiffness but not the peak strength measured at later stages (Lumb, ; Saeedy & Mollah, ). On the other hand, cemented soils and rocks can experience irreversible damages in cementing fabric when sheared up to the peak strength in earlier stages.…”

Section: Analyses and Discussionmentioning

confidence: 99%

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Multistage Triaxial Tests on Laboratory‐Formed Methane Hydrate‐Bearing Sediments

et al. 2018

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A sound understanding of the geomechanical behavior of hydrate-bearing sediments (HBSs) is essential not only for assessing reservoir and wellbore stability during methane gas production but also for projecting the impact of global warming on the stability of geological settings that contain hydrates. This study experimentally investigated the geomechanical responses of laboratory-formed methane-HBS to triaxial shearing under drained conditions. The hydrate pore habit formed in the sediments is noncontact-cementing, which is different from contact-cementing or grain-coating hydrate pore habits formed when the excessive gas method is used. The multistage triaxial test method, which shears a single specimen under different confinements, was employed to examine its applicability in measuring geomechanical properties of the HBS. Conventional single-stage triaxial tests were also performed to serve as baselines. The results show that both the strength and stiffness of HBS increase with increased hydrate saturation and confining stress. Shear dilatancy increases with increased hydrate saturation and decreased confining stress. The peak strength and peak/postpeak shear dilation measured using the multistage tests are comparable to those using the single-stage tests. However, the stiffness measured in later stress stages in the multistage tests was enhanced by the stress-strain history of earlier stages. Therefore, the multistage test offers an efficient way of measuring the strength and volumetric response of the HBS with a much smaller number of specimens than the single-stage test. This benefits the geomechanical characterization of the HBS, as obtaining the pressure cores is extremely costly and preparing lab samples is usually sophisticated and time consuming. Key Points: • Multistage triaxial tests are conducted on noncontact-cementing, hydrate-bearing sediments under drained conditions • The strength, dilatancy, and stiffness of the hydrate-bearing sediments are measured • The multistage test can be a viable and efficient method to measure the strength and dilatancy of the hydrate-bearing sediments

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Section: Introductionmentioning

confidence: 76%

Section: Analyses and Discussionmentioning

confidence: 99%

Multistage Triaxial Tests on Laboratory‐Formed Methane Hydrate‐Bearing Sediments

et al. 2018

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“…Although various research [1] [2] [10] [11] [12] [13] have demonstrated the economic viability of doing multistage triaxial testing on saturated soils, they have also identified the shear strength or effective shear strength of saturated as well as unsaturated soils [1] [10] [12] [14] and reviewed the test [13]. Consolidated undrained triaxial tests on various clay specimens using both conventional and multistage approaches and found that multistage compression tests concurred well with those conducted by [12].…”

Section: Introductionmentioning

confidence: 99%

Multistage Triaxial Behavior of Shallow Landslide Hazard Site Soil of Rangamati Sadar Area, Bangladesh

Khatun,

Hossain,

Sayem

2023

ENG

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The soil samples were collected from a shallow landslide hazard site of the Rangamati Sadar in Bangladesh to determine the shear strength properties of the soil. Multistage triaxial consolidation undrained test has become worldwide more accepted to determine the shear strength parameters. Multistage triaxial undrained tests were performed on five samples taken from five different depths of boreholes. Samples were evaluated under two natural conditions and three remolded situations. Samples were consolidated before shearing at confining pressures from 50 kPa to 1200 kPa. All the test results are discussed in terms of deviator stress versus axial strain, mean effective stress versus deviator curves, stress ratio versus axial strain, and excess p. w. p. versus axial strain curves. The samples consolidated at low effective stress first displayed peak positive values of excess p. w. p., followed by increased strains due to sample bulging failure, and only a few samples formed a shear surface failure. The strength parameters were estimated using the maximum deviator stress as the failure criterion i.e. the overall value of the cohesion is 20 kPa and the friction angle is 34˚. Hence, the critical state line has been constructed and the critical state parameters have been calculated. The critical state stress ratio M was calculated to be 0.036. The shear strength of soil is one of the significant mechanical properties that are thoroughly used to assess the landslide and liquefaction potentiality of the soil.

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Multi-stage triaxial test on brittle rock

Youn

Tonon

2010

International Journal of Rock Mechanics and Mining Sciences

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Application of Multistage Triaxial Test to Kuwaiti Soils

Cited by 7 publications

References 3 publications

Multistage Triaxial Tests on Laboratory‐Formed Methane Hydrate‐Bearing Sediments

Multistage Triaxial Tests on Laboratory‐Formed Methane Hydrate‐Bearing Sediments

Multistage Triaxial Behavior of Shallow Landslide Hazard Site Soil of Rangamati Sadar Area, Bangladesh

Multi-stage triaxial test on brittle rock

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