Answered: Borrow pit Void ratio G, Cost ($/m³) I…

Engineering

Civil Engineering

Borrow pit Void ratio G, Cost ($/m³) I 0.85 2.66 11 II 0.92 2.69 8 III 1.21 2.71 IV 0.89 2.73 10

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)

5th Edition

ISBN:9781305084766

Author:Saeed Moaveni

Publisher:Saeed Moaveni

Chapter20: Engineering Economics

Section: Chapter Questions

Problem 34P

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Concept explainers

Pricing Excavation and Backfill

Backfill, in construction, is the activity of returning the soil and gravel that are removed during building construction or using them again to toughen and support the foundation of the building or any other structural component.

Question

A proposed embankment fill requires 7500 m3 of compacted soil. The void ratio of the
compacted fill is specified as 0.7. Soil can be transported from one of the four borrow
pits, as described in the following table. The void ratio, specific gravity of soil solids,
and the cost per cubic meter for moving the soil to the proposed construction site are
provided in the table.
a. Determine the volume of each borrow pit soil required to meet the specification of
the embankment site.
b. Make the necessary calculations to select the borrow pit which would be most costeffective.

Borrow pit
Void ratio
G,
Cost ($/m³)
I
0.85
2.66
11
II
0.92
2.69
8
III
1.21
2.71
IV
0.89
2.73
10

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