What question did this study set out to answer?

To evaluate the accuracy of conventional laboratory and field vane shear testing for predicting the undrained strength of normally consolidated clay during an underwater slope failure.

September 1, 1973Journal of the Soil Mechanics and Foundations Division

Failure of Underwater Slope in San Francisco Bay

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Authors

JDJ. Michael DuncanUniversity of Arkansas at Fayetteville ABAlbert L. BuchignaniRafael Advanced Defense Systems (Israel)

Discussion

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Implication

Geotechnical failure analysis reveals creep-induced undrained strength reduction in marine clay slopes, indicating the necessity of empirical corrections in standard shear tests.

Key Points

To evaluate the accuracy of conventional laboratory and field vane shear testing for predicting the undrained strength of normally consolidated clay during an underwater slope failure.
Analyzed the failure of a 90-ft-high (27 m) submerged slope in San Francisco Bay.
Evaluated the influence of systematic testing errors, including sample disturbance, anisotropy, boundary restraints, and triaxial versus plane strain conditions.
Assessed the role of sustained loading and time-dependent creep on strength degradation.
Systematic testing discrepancies from disturbance, anisotropy, and boundary constraints had a negligible net effect on calculated undrained strength.
Strength reduction from undrained creep under prolonged loading was significant and resolved the disparity between laboratory-measured strength and actual field failure strength.
Empirical corrections are recommended to adjust measured shear strength for long-term creep effects in stability evaluations.

Cite This Study

Duncan et al. (1973) studied this question.

synapsesocial.com/papers/6a74734c99129e9915f53e73 https://doi.org/10.1061/jsfeaq.0001926

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September 1, 1973Journal of the Soil Mechanics and Foundations Division

Failure of Underwater Slope in San Francisco Bay

View Full Paper

Ask AI

Bookmark

Authors

JDJ. Michael DuncanUniversity of Arkansas at Fayetteville ABAlbert L. BuchignaniRafael Advanced Defense Systems (Israel)

Discussion

Member takes

Implication

Geotechnical failure analysis reveals creep-induced undrained strength reduction in marine clay slopes, indicating the necessity of empirical corrections in standard shear tests.

Key Points

To evaluate the accuracy of conventional laboratory and field vane shear testing for predicting the undrained strength of normally consolidated clay during an underwater slope failure.
Analyzed the failure of a 90-ft-high (27 m) submerged slope in San Francisco Bay.
Evaluated the influence of systematic testing errors, including sample disturbance, anisotropy, boundary restraints, and triaxial versus plane strain conditions.
Assessed the role of sustained loading and time-dependent creep on strength degradation.
Systematic testing discrepancies from disturbance, anisotropy, and boundary constraints had a negligible net effect on calculated undrained strength.
Strength reduction from undrained creep under prolonged loading was significant and resolved the disparity between laboratory-measured strength and actual field failure strength.
Empirical corrections are recommended to adjust measured shear strength for long-term creep effects in stability evaluations.

Cite This Study

Duncan et al. (1973) studied this question.

synapsesocial.com/papers/6a74734c99129e9915f53e73 https://doi.org/10.1061/jsfeaq.0001926

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