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|Title:||Retrogressive failures in sand deposits of the Mississippi River. Report 1, Field investigations, laboratory studies and analysis of the hypothesized failure mechanism|
|Authors:||United States. Army. Corps of Engineers. Lower Mississippi Valley Division.|
Torrey, Victor H.
Dunbar, Joseph B.
Peterson, Richard W.
Baton Rouge, Louisiana
Bonnet Carre Point, Louisiana
|Publisher:||Geotechnical Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-88-9 rept. 1.|
Abstract: This report is the first of a series documenting recent studies directed at determining the causes of, understanding the mechanism of, and developing defenses against retrogressive failures (flow slides) in sand deposits of the Mississippi River which threaten the safety of mainline flood protection levees below Baton Rouge, LA. A review of the literature tracing the progress of associated antecedent studies since their inception in the late 1940's is presented. Recent field and laboratory investigations relative to the Montz and Bonnet Carre Point, LA, failure sites are described and analyzed to infer the in situ character of the sand deposits. Results obtained form several in situ investigation techniques including fixed-piston undisturbed sampling, standard penetration testing, cone penetration testing, piezocone penetration testing, and Delft resistivity cone penetration testing are presented and compared. Geologic and historic hydrographic studies of the two sites are also included. A special series of hydrographic surveys to study river attack on the bank and performed along the Eighty-One Mile Point, Forty-Eight Mile Point, Bonnet Carre Point, and Montz bank reaches during each of the four periods in 1979 is presented. The weight of information gained is used to hypothesize a failure mechanism of retrogression in dilatant sand. The hypothetical mechanism is numerically analyzed and presented to fit reasonably a failure case history. NOTE: This file is very large. Allow your browser several minutes or more to download this file.
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