TUTORIALS
Utilization of Mean Area Method & understanding earth work computation for an embankment
This construction video tutorial is very useful for quantity surveyors. The tutorial briefly shows how the mean area method is utilized for detecting the earth work.
Instance 1
Compute the amount of earthwork for a bank (embankment) 150 m long and 10 m wide at the pinnacle (top). Side slope is simply 2:1 and the depths at every 30 m space are offered as 0.60, 1.2, 1.4, 1.6, 1.4 and 1.6 m
Resolution:
| Station | Depth | Centre area = B x d | Sides area = Sd2 | Overall area B x d + Sd2 | Mean area (A1 + A2) / 2 | Interval | Quantity Cut / Fill |
|---|---|---|---|---|---|---|---|
| 0 | 0.60 | 6 | 2 x (0.60)2 = 0.72 m2 | 6.72 | |||
| 30 | 1.2 | 12 | 2 x (1.2)2 = 2.88 m2 | 14.88 | (6.72 + 14.88) / 2 = 10.8 m2 | 30 m | 324 m3 |
| 60 | 1.4 | 14 | 2 x (1.4)2 =3.92 m2 | 17.92 | (14.88 + 17.92) / 2 = 16.4 m2 | 30 m | 492 m3 |
| 90 | 1.6 | 16 | 2 x (1.6)2 = 5.12 m2 | 21.12 | (17.92 + 21.12) / 2 = 19.52 m2 | 30 m | 585.6 m3 |
| 120 | 1.4 | 14 | 3.92 m2 | 17.92 | 19.52 m2 | 30 m | 585.6 m3 |
| 150 | 1.6 | 16 | 5.12 m2 | 21.12 | 19.52 m2 | 30 m | 585.6 m3 |
Overall filling or embankment amount = 2572.8 m3
Earth work amount = earth work volume and volume is equal to area x length
To get more details, go through the following video tutorial.
Lecturer: SL Khan
