Field measurements of shear strength of an underconsolidated marine clay

Karakouzian, Moses; Avar, B. B.; Hudyma, Nick; Moss, Jeffrey A

doi:10.1016/s0013-7952(02)00182-5

Cited by 17 publications

(12 citation statements)

References 3 publications

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“…excess pore pressure; see above), s n ¼ total vertical stress, and N kt ¼ the empirical cone factor. N kt has been established from laboratory-based undrained shear strength and corrected cone resistance testing (Karakouzian et al, 2003), and ranges between 8 and 30 for fine-grained cohesive sediments (see summary Lunne et al, 1997, Ch. 5.4.2.1).…”

Section: Cptu (Inmentioning

confidence: 99%

In situ cone penetration tests at the active Dashgil mud volcano, Azerbaijan: Evidence for excess fluid pressure, updoming, and possible future violent eruption

Kopf

Stegmann

Delisle

et al. 2009

Marine and Petroleum Geology

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Section: Cptu (Inmentioning

confidence: 99%

In situ cone penetration tests at the active Dashgil mud volcano, Azerbaijan: Evidence for excess fluid pressure, updoming, and possible future violent eruption

Kopf

Stegmann

Delisle

et al. 2009

Marine and Petroleum Geology

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“…in situ S u derived from q c , agrees well with the lab vane shear (Figures 3b and 3c), whereas in situ measurements using the vane shear probe are significantly lower (<8 kPa in the glacial clay; Figure 3a). The discrepancy between in situ vane shear and CPT data may be partly explained by a general underestimation of the first caused by the pre‐disturbance of the sediment by the insertion of the device before shearing and, moreover, by uncertainties when choosing the empirical factor N k for calculating S u from CPT data [ Karakouzian et al , 2003]. However, an overall increase in strength in the lower unit can be observed regardless of the method.…”

Section: Resultsmentioning

confidence: 99%

Geotechnical in situ characterization of subaquatic slopes: The role of pore pressure transients versus frictional strength in landslide initiation

Stegmann¹,

Strasser²,

Anselmetti³

et al. 2007

Geophysical Research Letters

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Mineralogical composition and pore fluid pressure are the crucial controls for mechanical stability of water‐saturated sediments. Their in situ measurements were undertaken in earthquake‐triggered slope deposits in Lake Lucerne (Switzerland) in addition to geophysical characterization and laboratory index properties, shear and consolidation experiments on core. Two lithological units were identified: A weak, lightly underconsolidated section of postglacial silty clays overlies overconsolidated fine‐grained glacial deposits with coarser components and excess fluid pressure (ca. 2.5× higher than in the hanging wall clay). In the event of an earthquake, hydrofracturing in the overconsolidated section facilitates an upward pore pressure pulse to the base of the softer, less stable unit. Here, excess pore pressure initiates sliding along a failure plane at the lithological boundary, causing the entire postglacial sedimentary section to slip downslope. We propose that many submarine landslides at active and passive continental margins may follow this mechanism of pore pressure‐induced failure.

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“…38 Underconsolidated sediments refer to those that are not sufficiently consolidated under the overburden pressure and contain EPWP. 39 This phenomenon possibly occurs due to (1) rapid deposition and impermeable property of the sediments (clay and diatomaceous ooze rich), 38 (2) the increase of pore water content caused by dissociation of hydrate, (3) the presence of hydrate veins that increases the strength of the sediments and supports the overburden pressure, and (4) creep or secondary consolidation. It has great importance to understand the mechanical characteristics of underconsolidated sediments because underconsolidated sediments can affect the stability of the seabed.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics of Underconsolidated Methane Hydrate-Bearing Clayed-Silty Sediments

Liu

Chen

et al. 2023

Energy Fuels

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Natural gas hydrate reserves in the South China Sea are huge, and their commercial prospects have been proved by repeated trial production. It is essential to systematically clarify the mechanical properties of hydrate-bearing sediments for the safe drilling of hydrate reservoirs. To date, most research studies focus on the undrained mechanical behavior of hydrate-bearing sandy or clayed sediments under normal consolidation conditions, but there are few reports on underconsolidated-undrained triaxial shear experiments. In this study, the present research conducts undrained triaxial shear tests on hydrate-bearing clayed-silty sediments. The results show that underconsolidated hydrate-bearing sediments appear to show a strain-hardening phenomenon, which are different from hydratebearing sands in Nankai Trough. The excess pore water pressure of hydrate-bearing sediments remains positive during shear. The increasing degree of consolidation will increase the failure strength and the Secant Young's modulus E 50 . According to the Mohr− Coulomb criterion, the corresponding predicting formulas are established, and the cohesion increases with the increase in the degree of consolidation, while the internal friction angle is not sensitive to the degree of consolidation. In addition, the failure strength and the Secant Young's modulus E 50 increase with the increase in initial effective confining stress before shearing.

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Field measurements of shear strength of an underconsolidated marine clay

Cited by 17 publications

References 3 publications

In situ cone penetration tests at the active Dashgil mud volcano, Azerbaijan: Evidence for excess fluid pressure, updoming, and possible future violent eruption

In situ cone penetration tests at the active Dashgil mud volcano, Azerbaijan: Evidence for excess fluid pressure, updoming, and possible future violent eruption

Geotechnical in situ characterization of subaquatic slopes: The role of pore pressure transients versus frictional strength in landslide initiation

Mechanical Characteristics of Underconsolidated Methane Hydrate-Bearing Clayed-Silty Sediments

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