Earthwork. Cross Section and Borrow Pit Methods. This lecture covers: Readings: 26-1 to 26-6, 26-8 to 26-10. Figures: 26-1 to 26-4, 26-6, and 26-7 Plate B-5 page 893, and B-2 page 890 Examples:26-1 and 26-3. Volumes. Usage: Quantities of earthwork and concrete
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Cross Section and Borrow Pit Methods
distance from CL
compute individual areas and add them up. After computing the
elevation at critical points, form a table:(mistakes!)
station H L C D E R G
24+00 0 C12.5 C15.8 C18.0 C10.1 C12.2 0
15 1533.8 20 0 33.3 15
Compute the areas and add them up.
The volume of any square, or part of a square is equal to the average
height(elevation difference) at the corners, times the area.
To compute the volume:
1- draw a line between the cut and the fill areas
2- compute the total volume
of all the complete cut squares,
do the same for the fill, use
the previous formula
3- Compute the
separately and add them to the
4- Compute the difference
between the cut and the fill.,
pay attention to the expansion
Assumed 36 for piles