the number of trips of each truck
A trapezoidal embankment for a highway of 30m wide at the top,1.5m in compacted thickness with a side slope of 1:3 is to be constructed from a silty sandy GRAVEL trucked from a borrow pit. The water content in the borrow pit is 15% and its void ratio is 0.69. Truck of 15m3 capacity will be used to carry the soil from the borrow pit at the void ratio of 0.80 and at the same moisture content as the borrow pit materials. The specification requires the embankment to be compacted at a dry unit weight of 18kN/m3. Specific gravity of the soil is 2.7 and unit weight of water is 9.8kN/m3. Determine, for 500m length of embankment, the number of trips of each truck assuming 20 trucks are allocated for this activity.
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