Please help calculate the volume of earthwork for excavation
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The bottom of a certain foundation pit is 80 m long, 60 m wide, and 8 m deep; the sides of the pit are sloped with a slope ratio of 1:0.5. Calculate the volume of earthwork that needs to be removed. If the external dimensions of the basement are 78m × 58m, and the final looseness coefficient of the soil is K/s = 1.03, determine the amount of backfill soil required for the basement area.
It can be cut into other three-dimensional shapes to calculate its volume: 80*60*8 + 4*8*60 = 38400 + 1920 = 40320 cubic meters
Volume of trench foundation: V = L * (ah + kh²), where a = width of the cushion layer + 2 * working width; h = depth of excavation; k = slope factor. Volume of foundation pit: V = (a + 2c + kh) * (b + 2c + kh) * h + 1/3 * k² * h³, where a = length of the longer base side, b = length of the shorter base side, c = working width, h = depth of excavation, k = slope factor
In my opinion, based on the formula: V=H/6(A1+4A0+A2), where V represents the volume of earth to be removed； H: Height ； A1: Top area ； Area at A0:1/2 ； A2: Base area ； V=8/6(68*88+4*64*84+60*80) =43050.667 Please correct me!