Site Geology, Jonesville Lock and Dam, Black River, Louisiana,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
Pagination or Media Count:
Scope of Investigations. Initial subsurface explorations in the vicinity of the proposed lock and dam were accomplished between June 1962 and January 1963 and consisted of 58 rotary-drilled borings. In 54 of the borings, samples were obtained at approximately 5-foot depth of intervals by either the auger and drive tube method or the vacuum-type Shelby tube method. Four borings, located along the proposed centerlines of the lock and the dam, were drilled to obtain continuous undisturbed cores 5 inches in diameter. Water content analyses of the clayey sediments and grain size analyses of the silty and sandy sediments were performed on all samples. Of the total number of borings 35 were drilled into the uppermost Tertiary deposits average elevation -76 while the remainder were drilled to an average elevation of -30. No water table data were recorded in any of the borings. Data from the borings indicated that the proposed location after an examination of the 58 borings and the development of the local stratigraphy, it was decided that the proposed location of the lock and dam should be shifted about 600 feet to the north to avoid as much as possible a buried mass of backswamp clays. these clays vary appreciably in thickness and have relative low compressive strengths and moderately high water contents.
- Geology, Geochemistry and Mineralogy
- Soil Mechanics
- Civil Engineering