Determine the amount of excavation needed for the spread footing in Figure 10.59. A three-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 as follows:
Depth = 7? + 2.5? = 9.5?
The distance from the toe of the slope to the top of the slope is calculated as follows:
DistanceSlope = 9.5? × 1? / 1? = 9.5?
Calculate the average width:
DistanceTop of excavation = 9.5? + 3? + 8? + 3? + 9.5? = 33?
DistanceBottom of excavation = 3? + 8? + 3? = 14?
DistanceAverage = (33? + 14?) / 2 = 23.5?
Calculate the average length:
DistanceTop of excavation = 9.5? + 3? + 17? + 3? + 9.5? = 42?
DistanceBottom of excavation = 3? + 17? + 3? = 23?
DistanceAverage = (42? + 23?) / 2 = 32.5?
Find the general excavation as follows:
General excavation = 23.5? × 32.5? × 9.5? = 7,256 bcf / 27 cf per cy = 269 bcy
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