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Title: Verification of empirical method for determining riverbank stability, 1957 data
Authors: United States. Mississippi River Commission
U.S. Army Engineer Waterways Experiment Station
Keywords: Potamology
Mississippi River
Soil mechanics
Soil testing
Soil tests
Soil sampling
Soils data
Slope stability
River banks
Bank erosion
Flow failure
Soil liquefaction
Revetment failure
River banks
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Series/Report no.: Potamology investigations report ; no. 12-8.
Description: Potamology Report
Summary: This report is the fifth of a series in which new data obtained from borings made for revetment construction are analyzed to determine the applicability of the empirical method for predicting bank stability with regard to liquefaction failures. Data obtained principally in fiscal year 1957 are analyzed, and stability predictions are made for 17 new areas. Failures at sites previously analyzed also are discussed. During the spring of 1957, 48 bank failures were reported at 30 boring locations on 17 sites for which stability predictions had been made. Twelve of the failures were believed to be of the flow type and the others were considered to be of the shear type, resulting from current scour or other causes. 7 of the 12 flow failures occurred at boring locations predicted to be stable. Since 1954 when stability predictions were started, 456 boring locations at 59 revetment sites on the Mississippi River in the Memphis and Vicksburg Districts have been analyzed. Of 51 boring locations predicted to be unstable, 11 have had flow failures, 34 have had no failures, and 6 have not been revetted. Flow failures have also occurred at 9 of the 312 revetted locations predicted to be stable with regard to liquefaction-type failures. An analysis of the performance data indicates that the classification criteria for overburden and zone A sand should be modified. Use of the modified classification criteria would have resulted in a predicted susceptibility to flow failure at all flow failure locations except two where the borings did not penetrate the full depth of zone A sands. The stability of banks with respect to flow slides appears to be related to the empirical criteria set forth in this report. However, other factors such as potential deepening of the thalweg at the toe of the revetment, and migration of the river current need to be studied for purposes of refining the criteria. The difference in variation of the river stage with respect to bankfull should also be considered. It is recommended that studies be continued until all revetted sites for which predictions have been made have been subjected to river stages at least 10 ft above bankfull.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Potamology Investigations Report

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