Given: Borrow soil will be required to fill a 10,000 yd^3 depression in the grou

Question

Given:

Borrow soil will be required to fill a 10,000 yd^3 depression in the ground. The borrow soils have a moist unit weight of 100 pcf, a water content of 12% and a specific Gravity of 2.60. The job specification requires that the fill soils need to be compacted to a dry unit weight of 110 pcf and a water content of 15%.

Compute:

A) How many cubic yards of borrow soil are needed?

B) How many gallons of water will have to be added to achieve the required moisture content in the fill areas, assuming there is no loss due to evaporation during transportation.

Explanation / Answer

A) x= 10000 yd 3 *27pcf/yd3 =27000 pcf

Yd=100/(1+0.12)=89.28 pcf

x=27000*(110/89.28)

   =33266.129 pcf

x = 1232.07885 cubic yards Borrow soil are needed

B) w= 33266.129 pcf *100*0.12

       w =399193.548pcf *7.48pcf/gallon

       w=2985967.74 gallons have to added to achieve the required moisture content.

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