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>Engineering Properties Determination of In-Situ Glacial Till and Lacustrine Silt associated with Remediation of Deep Seated Abutment Movement Downstream of Nesbitt Dam
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Engineering Properties Determination of In-Situ Glacial Till and Lacustrine Silt associated with Remediation of Deep Seated Abutment Movement Downstream of Nesbitt Dam
Nesbitt Dam is a composite earth-fill embankment with stone masonry corewall, non-overflow and spillway section. Historical survey data indicate that thedownstream hillside and right abutment has been subjected to movement over a60 year period from 1920 to 1980s. Inclinometers established during a 2007subsurface investigation depicted 12.7 millimeters (0.5 inches) of movement within alacustrine silt stratum at a depth of approximately 30 meters (100 feet) six monthsafter installation. This paper presents the procedures and analyses used by GannettFleming to identify, model, and design a remedial solution to limit future hillsideinstability. This paper focuses on the extensive laboratory testing program conductedon the lacustrine silt and adjacent strata to thoroughly establish the engineeringproperties of site soils.
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