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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A087 (1981)

First Page: 76

Last Page: 92

Book Title: CN 18: Offshore Geologic Hazards

Article/Chapter: Application of Infinite Slope Analysis to Subaqueous Sediment Instability, Mississippi Delta: Appendix 5-2

Subject Group: Oil--Methodology and Concepts

Spec. Pub. Type: Course Notes

Pub. Year: 1981

Author(s): David B. Prior, Joseph N. Suhayda

Abstract:

Prior, D. B. and Suhayda, J. N., 1979. Application of infinite slope analysis to subaqueous sediment instability, Mississippi delta. Eng. Beol., 14: 1-10.

Submarine landslides are described on very low angle slopes (0.5°-1.7°) in the Mississippi prodelta area and are evaluated using infinite slope analysis. For instability to occur, pore water Previous HitpressureNext Hit ratios in excess of hydrostatic (u/^ggrwz) and approaching Previous HitgeostaticNext Hit (u/^ggr^prime z) are needed. These calculated values, based on three sets of effective strength parameters and for two sediment depths to failure, are in close agreement with measured pore water Previous HitpressureTop data from in situ piezometers. Ratios of u/^ggr^prime z as large as 0.986 have been monitored. Mud vents are al o indicative of large internal pressures within the sediments, generated by rapid sedimentation, wave perturbation, and biogenic methane. The analysis suggests that the reduction in effective stress may be sufficient to cause failure by gravitational stresses alone.

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