If a cut only 50-foot by 50-foot grid has cut depths at the corners of 2\', 3\',

Question

If a cut only 50-foot by 50-foot grid has cut depths at the corners of 2', 3', 1', and 2', the excavated volume in BCY is most nearly: 2.When establishing a grid to estimate site grading (referenced as the cross section method in the textbook), which factor allows a larger grid spacing to be used? 3.If we are to backfill 20 BCY of topsoil, how much will it be in CCY with a shrinkage rate of 0.9? 4.When calculating how much soil to haul off, what type of CY are used? 5.When calculating how much soil to excavate, what type of CY are used?

2.When calculating how much soil to excavate, what type of CY are used?

Explanation / Answer

If a cut only 50-foot by 50-foot grid has cut depths at the corners of 2', 3', 1', and 2', the excavated volume in BCY is most nearly:

Here in 50 x 50ft grid,

length (l) = 50ft

width (w) = 50ft

depth ( d) = 2 ft   (because cut depths are 2+3+1+2 ft = 8ft/4=2ft average)

So volume of excavation = 50 x 50 x 2 = 5000 ft

                                                                = 185 BCY

2.When establishing a grid to estimate site grading (referenced as the cross section method in the textbook), which factor allows a larger grid spacing to be used?

V = T * A * (1/27)
Where,
V = volume (cubic yards)
A = surficial slope area (square feet)
T = thickness of strata or even cut (feet)

So V, A and T factors allows larger grid spacing to be used

3.If we are to backfill 20 BCY of topsoil, how much will it be in CCY with a shrinkage rate of 0.9?

Means 1 BCY = 0.9 CCY

If backfill 20 BCY = 20 x 0.9 = 18 CCY (@ 0.9 shrinkage rate)

4.When calculating how much soil to haul off, what type of CY are used?

22.22 BCY soil should be hauled off to fill 20 BCY as the

shrinkage rate of soil is 0.9

5.When calculating how much soil to excavate, what type of CY are used?

When we excavate soil it will swell, so we have to excavate more than 22.22 BCY of soil based on its swelling factor.

Soil in natural condition 1 CY, becomes 1.25 CY after excavation and becomes 0.90 CY after compaction

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