Comparative Study of Sand Porosity and a Technique for Determining Porosity of Undisturbed Marine Sediment

Curry, Conrad; Bennett, Richard H.; Hulbert, Matthew H.; Curry, Kenneth J.; Faas, Richard W.

doi:10.1080/10641190490900844

Cited by 48 publications

(35 citation statements)

References 18 publications

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“…Bolton's study suggests that deposits having a relative density larger than 20% can dilate when the confining stress is less than 100kPa (Bolton, 1986). A majority of the published cases I found have relative densities ( ) larger than 20%, suggesting that dilative sand is common in such environments (Breslau, 1967;Pryor, 1972;Beard and Weyl, 1973;Bennett and Stockstill, 1999;Richardson et al, 2001;Curry et al, 2004 Larger values of means the deposit has smaller porosity/void ratio. means the in situ porosity is smaller than the estimated minimum value and means the in situ porosity is larger than the estimated maximum value.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…Each constructed deposit had 6 thin (~ 0.01 m), roughly evenly spaced in the vertical direction and horizontal layers of brown colored medium sand that served as marker beds so that internal deformations in the deposit could be visualized. Deposit porosity was ~36 %, with a relative density of 85 %; a relative density that is commonly observed in the field (e.g., Curry et al, 2004).…”

Section: Experiments Setupmentioning

confidence: 99%

“…The study should also collect sediment samples for lab analysis and experiments. In situ porosity can be measured using a resistivity tool, following the well-established methods (Curry et al, 2004). Grain size distribution can be measured from sediment samples taken from the field.…”

Section: Study How Common Dilation Is In the Fieldmentioning

confidence: 99%

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Dynamics of dilative slope failure

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Flemings

Mohrig

2012

Geology

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Experiments Setupmentioning

confidence: 99%

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Dynamics of dilative slope failure

You

Flemings

Mohrig

2012

Geology

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“…Pryor (1973) used volumetric methods, whereas Lundegard (1992) quantitatively estimated the amount of porosity loss through compaction and cementation. Atkins and McBride (1992), Curry et al (2004) and Dickinson and Ward (1994) point-counted the upper surface of thin sections of epoxy-or superglue-impregnated samples in reflected light. Among the various methods that have been applied by different researchers (Beard and Weyl, 1973;Roberts et al, 1998), it is worth mentioning the use of diver cores with in-situ conductivity probes and X-ray computed tomography (CT) scanning techniques (Bloom et al, 2010;Briggs et al, 2010).…”

Section: Materials and Methodologymentioning

confidence: 99%

“…Numerous studies of geological and geotechnical engineering applications to measure the maximum and minimum porosities for different grain size distributions and/or sorting coefficients have been conducted (Bloom et al, 2010;Curry et al, 2004;Gaither, 1953;King, 1899). However, none of these authors studied porosity for beach-monitoring purposes.…”

Section: Introductionmentioning

confidence: 99%

Beach nourishment effects on sand porosity variability

Román-Sierra

Muñoz-Pérez

Navarro-Pons

2014

Coastal Engineering

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A standard assumption in coastal engineering is that the porosity of natural beach sand (non-cohesive) is 40%. However, is this assumption correct for all beach sand? This paper proposes an accurate and simplified method to assess changes in sand porosity after beach nourishment by means of in-situ density surveys through a nuclear densimeter. This novel application has been applied to different beaches in the southwest of Spain according to the tidal range, grain size and beach morphology in several terms. General results show that sand porosities range from 25.6% to 43.4% after beach nourishment works. This research can be considered a support tool in coastal engineering to find shifting sand volumes as a result of sand porosity variability after beach nourishment and later marine influence.

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How heterogeneity in the shear dilation of a deposit controls the mechanics of breaching slope failure

et al. 2014

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Breaching is a type of retrogressive submarine slope failure associated with pore pressure drops in both space and time, and this drop strengthens the failing deposit. Breaching is characterized by a near‐vertical failure surface that retreats with a relatively constant velocity, on the order of a millimeter per second. Breaching is controlled by interactions between shear‐dilation‐generated pore pressure drops and pore pressure dissipation through intergranular fluid flow. Laboratory measurements show that shear dilation in a deposit increases with increasing effective stress ratio between the major principal effective stress and the minor principal effective stress as well as decreasing confining stress. We present a two‐dimensional numerical model that indicates how effective stress ratio and confining stress produce spatially varying dilation, affecting the mechanics of breaching. Experimental results show that dilation in a breaching deposit increases with proximity to the failure surface. As a result, the maximum magnitude of pore pressure drop is very close to the failure surface. The numerical model confirms that the sediment release is dominated by pore pressure dissipation through intergranular fluid flow in the horizontal direction. This allows the erosion rate to be treated as a constant in the vertical direction. Numerical model results also show that because dilation decreases with increasing vertical depth, the deposit becomes less stable with depth, suggesting a potential upper limit for the thickness of the deposit undergoing breaching.

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Comparative Study of Sand Porosity and a Technique for Determining Porosity of Undisturbed Marine Sediment

Cited by 48 publications

References 18 publications

Dynamics of dilative slope failure

Dynamics of dilative slope failure

Beach nourishment effects on sand porosity variability

How heterogeneity in the shear dilation of a deposit controls the mechanics of breaching slope failure

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