A dam includes a sheet pile "cut off" wall near the toe, installed to 7 ft below the groundline. Water seepage is assumed to be at steady state at this time step shown. At this time, the depth of the upstream pond (headwater) is 5 feet. The groundwater is at the same level as the ground on the downstream/tailwater side. The sand stratum thickness, where water is flowing, is 9 ft thick. The permeability of the sand, in the zone of the flow net, is k=42ft/day, the length of the dam (into the page) is 150 ft, and the unit weight of the sand is γsat=128 lb/ft3 (saturated unit weight of the soil). Use γw=62.4 pcf (unit weight of water) for your calculations, where necessary. What is the factor of safety against a quick condition? (use the dimensions given in the problem state to help estimate lengths, where needed)
A dam includes a sheet pile "cut off" wall near the toe, installed to 7 ft below the groundline. Water seepage is assumed to be at steady state at this time step shown. At this time, the depth of the upstream pond (headwater) is 5 feet. The groundwater is at the same level as the ground on the downstream/tailwater side. The sand stratum thickness, where water is flowing, is 9 ft thick.
The permeability of the sand, in the zone of the flow net, is k=42ft/day, the length of the dam (into the page) is 150 ft, and the unit weight of the sand is γsat=128 lb/ft3 (saturated unit weight of the soil). Use γw=62.4 pcf (unit weight of water) for your calculations, where necessary.
What is the factor of safety against a quick condition? (use the dimensions given in the problem state to help estimate lengths, where needed)
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