Determine the amount of excavation needed for the basement in Figures 9.50 and 9.51. A two-foot working distance is required and the excavation will be sloped 1.5:1 (1.5 vertical feet for every horizontal foot).
What will be an ideal response?
Determine the depth as follows:
Depth = 10? – 1? + 1? = 10?
The distance from the toe of the slope to the top of the slope is calculated as follows:
DistanceSlope = 10? × 1? / 1.5? = 6?8?
Calculate the average width:
DistanceTop of excavation = 6?8? + 2? + 11? + 22? + 11? + 2? + 6?8? = 41?2?
DistanceBottom of excavation = 2? + 11? + 22? + 11? + 2? = 27?10?
DistanceAverage = (41?2? + 27?10?) / 2 = 34?6? = 34.5?
Calculate the average length:
DistanceTop of excavation = 6?8? + 2? + 11? + 34? + 11? + 2? + 6?8? = 53?2?
DistanceBottom of excavation = 2? + 11? + 34? + 11? + 2? = 39?10?
DistanceAverage = (53?2? + 39?10?) / 2 = 46?6? = 46.5?
General excavation = 34.5? × 46.5? × 10? = 16,042 bcf / 27 cf per cy = 594 bcy
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