Determine the amount of excavation needed for the continuous footings in Figures 9.57 and 9.58. A two-foot working distance is required and the excavation will be sloped 1:1.75 (1.75 vertical feet for every horizontal foot).
What will be an ideal response?
Determine the depth and length of wall as follows:
Depth = 2? – 8? + 1?2? = 2?6? = 2.5?
Length of wall = 40? + 30? + 40? + 30? + 15? + 19? = 174?
The distance from the toe of the slope to the top of the slope is calculated as follows:
DistanceSlope = 2.5? × 1? / 1.75? = 1.4?
Calculate the average width:
DistanceTop of excavation = 1.4? + 2? + 2.5? + 2? + 1.4? = 9.3?
DistanceBottom of excavation = 2? + 2.5? + 2? = 6.5?
DistanceAverage = (9.3? + 6.5?) / 2 = 7.9?
Find the general excavation as follows:
General excavation = 174? × 7.9? × 2.5? = 3,436 bcf / 27 cf per cy = 127 bcy
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