Determine the amount of excavation needed for the continuous footings in Figures 9.54 and 9.55. A one-foot working distance is required and the excavation will be sloped 1:1 (one vertical foot for every horizontal foot).
What will be an ideal response?
Determine the depth and perimeter as follows:
Depth = 2? – 1? + 1? = 2?
Perimeter = 25? + 21? + 5? + 15? + 20? + 36? = 122?
The distance from the toe of the slope to the top of the slope is calculated as follows:
DistanceSlope = 2? × 1? / 1? = 2?
Calculate the average width:
DistanceTop of excavation = 2? + 1? + 2? + 1? + 2? = 8?
DistanceBottom of excavation = 1? + 2? + 1? = 4?
DistanceAverage = (8? + 4?) / 2 = 6?
Find the general excavation as follows:
General excavation = 122? × 6? × 2? = 1,464 bcf / 27 cf per cy = 54.2 bcy
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