TUTORIALS
Earthwork Estimation Calculation for Road
Calculate approximately of earthwork through mean area method in partially cutting as well as filling lengthwise regarding road embankment.
Road formation width in plain region is 22 ft as well as side slope in cutting is 1:1 and in filling is 2:1. Formation level at RD equal to 0 is 575.00m ft.
On the part of road upward gradient of 200:1 is suggested. Natural surface levels at different RDs are specified underneath – compute quantity of earthwork for the road?
| Reduced Distance | 0 (cutting) | 100 (cutting) | 200 (cutting) | 212.50 RD of IMP | 300 (filling) | 400 (filling) | 500 (filling) |
|---|---|---|---|---|---|---|---|
| N.S.L. | 577.65 | 576.85 | 576.15 | 0 | 575.45 | 574.65 | 573.75 |
| F.S.L. | 575 | 575.50 | 576 | 0 | 576.50 | 577 | 577.50 |
| Depth (d) F.S.L. - N.S.L. | -2.65 | - 1.35 | - 0.15 | 0 | 1.05 | 2.35 | 3.75 |
| Area (A) equal to (a + b/2 x d) (ft2) | 65.32 | 31.52 | 3.32 | 0 | 25.30 | 62.75 | 110.63 |
Specified information:
- Tap width of road equal to B equal to 22 ft (will be similar in all over the embankment)
- Side slope in cutting equal to S1 equal to 1:1 equal to 1
- Side slope in filling equal to S2 equal to 2:1 equal to 2
- Depth in cutting / Filling equal to 4 equal to Formation level – NSL
- Upward gradient slope equal to +g equal to 200:1 equal to 200
- Formation level at initial RD equal to FL equal to 575
- Since the formation is in a upward gradient (+g) of 200:1, formation width is 22 ft as well as formation level at R.D. equal to 0 is 575 so (specified info)
- The boost in formation level equal to Interval/gradient slope equal to 100/200 m equal to 0.50 ft
Cross-section at R.D. equal to 0:
Implementing Trapezoidal formula, Cutting area equal to (a + b)/2 x d
Wherein - a equal to formation width, b equal to total width of embankment, d equal to embankment depth
Top width, a equal to 22 ft
Depth, d equal to -2.65 ft
Slope equal to 1:1
Bottom width, b equal to 27.3 ft
Cutting area equal to (22 + 27.3)/2 x 2.65 equal to
For additional info view the video:
Lecturer: Engr Waseem Raja
