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Question

As per the compaction specification, a highway fill of 1.5 km length has to be compacted to 90% of Indian standard light compaction test dry density. A borrow pit available near the project site has a dry density of 1.78 g/cc at 100% compaction and a void ratio of 0.63. The volume of borrow pit material required to construct a highway fill of height 5 m and top width of 10.5 with side slope of 1V:2H is (Assume G=2.7)

A
153750 m3
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B
158937m3
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C
148731m3
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D
57486m3
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Solution

The correct option is C 148731m3


γd(borrow)=1.78g/cc
eborrow=eb=0.63
G = 2.7

Base width of highway fill =2×(2×5)+10.5=30.5 m
Vol. of highway fill, Vf=12(10.5+30.5)×5×1500=153750m3

Dry density of highway fill (90%)=0.90×1.78=1.602 g/cc
To find void ratio of fill

γd(fill)=Gγw1+ef
1.602=2.7×11+ef
ef=0.685

Since volume solids remain constant in both borrow pit and fill

Vb1+eb=Vf1+ef

Vb=(1+eb1+ef)Vf=(1+0.631+0.685)×153750=148731m3

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