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Title: Correlation of engineering properties of cohesive soils bordering the Mississippi River from Donaldsonville to Head of Passes, La.
Authors: United States. Army. Corps of Engineers. New Orleans District.
Montgomery, Raymond L. (Raymond Lowree)
Keywords: Cohesive soils
Deltaic plain
Geological sedimentation
Mississippi River
Soil properties
Soil mechanics
Publisher: Soils and Pavements Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: The purpose of this study was to analyze available data on selected cohesive deltaic plain soils and provide summaries of engineering data and correlations of engineering properties according to environments of deposition of the deltaic plain of the Mississippi River. The Mississippi River deltaic plain is that part of southeastern Louisiana that borders the Mississippi River from near Donaldsonville to Head of Passes. The deltaic plain is a complexly interfingered mass of fluvial, fluvial-marine, paludal, and marine deposits laid down in a variety of environments directly above the Pleistocene. This study focused attention on the deltaic plain deposits that are most important from an engineering standpoint. The deposits selected for study were the natural levee, point bar, and backswamp deposits of fluvial environment and the interdistributary, intradelta, and prodelta deposits of the fluvial-marine environment. Engineering data were obtained from data files on previous field and laboratory investigations of these soils for Corps of Engineers projects. The data were grouped according to environments of deposition based on the geological sections. No additional field or laboratory investigations were undertaken for this study. The data were collected and arranged in such a manner that it was possible to describe the data mathematically. The best-fit curves or lines, regression equations, and standard deviations presented for the data were developed by use of a computer. Based on the analyses, a number of important relations and trends appear to exist for the selected Mississippi River deltaic plain fine-grained cohesive deposits. Frequency histograms provide summaries of typical soil properties, and correlation plots show the relationships between the different soil properties. A number of correlations were made between Atterberg limits and data from relatively complex and more costly tests for physical properties. Reasonable correlations were found to exist between data from Atterberg limits tests and specific gravity, unconsolidated-undrained shear strengths, drained shear strengths, and compression indexes. Also, reasonable correlations between plasticity index and liquid limit were developed for each deposit. Correlations between shear strength increase ratio and plasticity index proved inconclusive. Important correlations between properties were found for soils of similar geologic origin and depositional environment. However, sufficient data were not available to establish conclusive relationships.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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