An earth embankment is to be constructed with compacted cohesionless soil. The volume of the embankment is 5000 m3 and the target dry unit weight is 16.2 kN/m³. Three nearby sites (see figure below) have been identified from where the required soil can be transported to the construction unid rotioc (o) of different sites are shown

Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter3: Weight–volume Relationships
Section: Chapter Questions
Problem 3.24P
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An earth embankment is to be constructed with
compacted cohesionless soil. The volume of the
embankment is 5000 m3 and the target dry unit
weight is 16.2 kN/m3. Three nearby sites (see
figure below) have been identified from where the
required soil can be transported to the construction
site. The void ratios (e) of different sites are shown
in the figure. Assume the specific gravity of soil
to be 2.7 for all three sites. If the cost of
transporation per km is twice the cost of excavation
per m3 of borrow pits, which site would you choose
as the most economic solution? (Use unit weight
of water = 10 kN/m3)
(a) Site X
(b) Site Y
(c) Site Z
(d) Any of the sites
Site X
e 0.6
140 km
Construction
Site
100 km
80 km
Site Z
Site Y
e 0.64
e= 0.7
Transcribed Image Text:An earth embankment is to be constructed with compacted cohesionless soil. The volume of the embankment is 5000 m3 and the target dry unit weight is 16.2 kN/m3. Three nearby sites (see figure below) have been identified from where the required soil can be transported to the construction site. The void ratios (e) of different sites are shown in the figure. Assume the specific gravity of soil to be 2.7 for all three sites. If the cost of transporation per km is twice the cost of excavation per m3 of borrow pits, which site would you choose as the most economic solution? (Use unit weight of water = 10 kN/m3) (a) Site X (b) Site Y (c) Site Z (d) Any of the sites Site X e 0.6 140 km Construction Site 100 km 80 km Site Z Site Y e 0.64 e= 0.7
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