Strength and Stress-Strain Characteristics of Cemented Deep-Sea Sediments

Nacci, V.A.; Kelly, William E.; Wang, Mian C.; Demars, Kenneth R.

doi:10.1007/978-1-4684-2754-7_6

Cited by 19 publications

(9 citation statements)

References 2 publications

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“…This phenomenon has been observed for other sandy or coarse-grained sediments (Marsters, 1986) and by previous investigators for calcareous sediments (Demars, 1982;Nacci et al, 1974). In these cases, a specific point of maximum curvature could not be defined, and minimum and maximum values were selected, resulting in a range for P c ' for the sample.…”

Section: Resultsmentioning

confidence: 55%

“…If the shape and slope of the unloaded portion of the curve depend on the properties of the sediment, and are not affected by disturbance or pressure, then it is reasonable to assume that geologic rebound or rebound upon removal of (or from) overburden pressure is approximately parallel to test curves for the same material. The presence of intraparticle water in calcareous sediments and the possible effect on consolidation behavior has been discussed by Nacci et al (1974), Demars (1982), and Valent et al (1982). Choquette and Pray (1970) defined intraparticle porosity as porosity within individual particles or grains, and stated that it is an important part of the preserved porosity in carbonate rocks.…”

Section: Consolidation Behaviormentioning

confidence: 99%

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Consolidation Test Results and Porosity Rebound of Ontong Java Plateau Sediments

Marsters¹,

Manghnani²

1993

Proceedings of the Ocean Drilling Program

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Consolidation tests were performed on 19 samples of calcareous ooze from the Ontong Java Plateau, obtained during Ocean Drilling Program Leg 130. Rebound curves from consolidation tests on Ontong Java Plateau samples yield porosity rebounds of 1 %-4% for these sediments at equivalent depths up to 1200 mbsf. The exception is a radiolarian-rich sample that has 6% rebound. A rebound correction derived from the porosity rebound vs. depth data has been combined with a correction for pore-water expansion to correct the shipboard laboratory porosity data to in-situ values. Comparison of the laboratory porosity data corrected in this manner with the downhole log data shows good agreement.

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Section: Resultsmentioning

confidence: 55%

Section: Consolidation Behaviormentioning

confidence: 99%

Consolidation Test Results and Porosity Rebound of Ontong Java Plateau Sediments

Marsters¹,

Manghnani²

1993

Proceedings of the Ocean Drilling Program

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“…This is to be expected since both measure undrained shearing resistance at the initial water content. However, these values are both low compared with the range of 0.25 to 0.35 for marine clays (Lambe and Whitman, 1969), and are very low when compared with typical values for sediments with high carbonate content reported in the literature (Nacci et al, 1974). This possibly results from disturbance and stress change upon sampling.…”

Section: Strength Propertiesmentioning

confidence: 73%

Geotechnical Properties of Sediments from Walvis Ridge, Deep Sea Drilling Project, Leg 75, Hole 532A

1984

Initial Reports of the Deep Sea Drilling Project

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During Leg 75 of the Deep Sea Drilling Project (DSDP) from the D/V Glomar Challenger, a 200-m deep hole was drilled at Hole 532A on the eastern side of Walvis Ridge at a water depth of 1331 m. Sediment cores were obtained by means of a hydraulic piston corer. All of the cores from this boring were designated for geotechnical studies and were distributed among eight institutions. The results of laboratory studies on these sediment cores were compiled and analyzed. Sediment properties, including physical characteristics, strength, consolidation, and permeability were studied to evaluate changes as a function of depth of burial. It was concluded that the sediment profile to the explored depth of 200 m at Walvis Ridge consists of approximately 50 m of foram-nannofossil marl (Subunit la) over 64 m of diatomnannofossil marl (Subunit lb) over nannofossil marl (Subunit lc) to the depth explored. All three sediment units appear to be normally consolidated, although some anomalies seem to exist to a depth of 120 m. No distinct differences were found among the sediment properties of the three subunits (la, lb, and lc) identified at this site.

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“…The principles outlined by McCave (1984) probably hold true for carbonate oozes, although the mechanisms of aggregation may vary because of the relatively uncohesive properties of ooze particles. The geotechnical behavior of deposited ooze is more like that of a quartz silt than that of a cohesive clay (Nacci et al, 1973). As with terrigenous sediment, deposition of oozes can be described by the equation:…”

Section: Bottom Currentsmentioning

confidence: 99%

Sedimentation on Feni and Gardar Sediment Drifts

Kidd¹,

Hill²

1987

Initial Reports of the Deep Sea Drilling Project

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Feni and Gardar ridges are two major North Atlantic sediment drifts-positive sedimentary accumulations over 1600 m thick presumed to result from sediment distribution by bottom water circulation since Eocene-Oligocene time. At Deep Sea Drilling Project Sites 610 and 611 we penetrated the Miocene to Holocene sequences of these drifts, and we looked for depositional changes across sediment wave fields on their surfaces with a series of offset holes. The sediment waves, over 20 m in height and over 2 km in wavelength, are morphologically more complex than hitherto recognized. Around the drill sites, waves characterize the upper 100 to 200 m of seismic sections, but we found no evidence of wave migration in these records. Lithologies in the sediment waves are fundamentally pelagic. Few current-produced sedimentary structures or hiatuses were found. Glacial cycles allow detailed wave-to-trough correlations, which show that since 2.4 Ma, little or no wave migration could have occurred. Sedimentation rate differences between wave and trough locations suggest that wave migration did occur in the Pliocene at the Gardar Ridge site. A review of possible sedimentary processes and parameters indicates that internal waves in a stratified water column might be important for the initiation and migration of sediment waves. Changes in sedimentary regime on the drifts seem to be linked to interaction between bottom water masses from northern (Norwegian Sea Overflow Water-NSOW) and southern (Antarctic Bottom Water-AABW; and North Atlantic Deep Water-NADW) sources and not to changes in intensity of NSOW alone. Regional seismic reflectors drilled at the Feni Ridge site are linked to oceanographic changes: "R2" of early Miocene age appears to signify a silica productivity event; "Rl" of late Miocene age could be linked to the isolation of the Mediterranean, which may have affected the NADW slope current. Our interpretation of the sedimentary history of the drifts is that during the preglacial period NSOW was probably the dominant bottom water mass over the drifts and the sediment waves were actively migrating. We suggest that the influence of NSOW lessened with the onset of the glacial-interglacial periods. Since that time, bottom currents have simply "maintained" the morphology of the now largely relict wave fields.

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Strength and Stress-Strain Characteristics of Cemented Deep-Sea Sediments

Cited by 19 publications

References 2 publications

Consolidation Test Results and Porosity Rebound of Ontong Java Plateau Sediments

Consolidation Test Results and Porosity Rebound of Ontong Java Plateau Sediments

Geotechnical Properties of Sediments from Walvis Ridge, Deep Sea Drilling Project, Leg 75, Hole 532A

Sedimentation on Feni and Gardar Sediment Drifts

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