A highlight of environmental and engineering geology in Fargo, North Dakota, USA |
| |
| Authors: | Fred J Anderson |
| |
| Institution: | (1) North Dakota Geological Survey, 600 East Boulevard Avenue, Bismarck, ND 58505-0840, USA |
| |
| Abstract: | Several unfavorable environmental and engineering geologic conditions exist in Fargo, North Dakota. Dominantly, the behavior
of smectitic clays within the proglacial Lake Agassiz sediments of the Sherack and Brenna Formations creates subsoil instability
beneath engineered structures in the Fargo area and slope instability within cutbank meanders of the Red River of the North.
Unfavorable engineering geologic conditions encountered include: the elastic deformation of clayey glaciolacustrine soils,
shrink-swell properties, inadequate bearing capacities, and mass movements. These conditions are responsible for structural
failures including the Fargo Grain Elevator in 1955 and the Northern Pacific railroad grade. Bank failures along the Red River
are common due to the inherent instability of Brenna Formation smectitic clays which are subject to plastic deformation in
the subsurface, with resultant block failure of overlying Sherack Formation. Recent alluvial sediments due to typical fluvial
action and the continued seasonal saturation of cutbank meanders within the floodplain also add to soil instability. |
| |
| Keywords: | Clay soils Foundation failure Glacial lake agassiz Sherack formation Brenna formation Smectite Fargo Red River Valley North Dakota USA |
| 本文献已被 SpringerLink 等数据库收录！ |
|
