EARTHWORK

EARTHWORK CROSS SECTIONSEARTHWORK VOLUMES

EARTHWORK CROSS SECTIONS

EARTHWORK CROSS SECTIONS

• Cut / Excavation wherever the existing ground is above the

constructed section

• Fill / Embankmentwherever the existing ground is below the

constructed section

EARTHWORK CROSS SECTIONS

• Catch PointsThe points at which the cut or fill slopes

intersect the ground

• Hinge PointsThe points at which the cut or fill slopes

intersect the nearly horizontal roadway surface

Example 1

The following are notes for an irregular cross section. Compute the cross-sectional area by dividing it into triangles and trapezoids. The roadway is 14 m wide and the side slopes are 1:2.

Solution

EARTHWORK VOLUMES

• AVERAGE END AREA METHOD

EARTHWORK VOLUMES

• Prismoidal formula

EARTHWORK VOLUMES

Example 2Given the end area below. Calculate the

volumes of cut and fill between sta. 351+ 00 and 352+50. If the material shrinks 12%, how much excess cut or fill is there?

StationEnd Areas(m^3)

Cut Fill

351+00 57.93

351+50 52.28

351+75 23.58

352+00 8.4 3.73

352+14 13.8

352+50 33.34