The Undisturbed soil at a given borrow pit is found to have the following parameters. The water content is 15%, the void ratio is 0.60 and the specific gravity of the solids is 2.70. The soil from this borrow pit is to be used to construct a rolled fill having a finished volume of 50,000 yd3. The soil is excavated by means of a shovel and dumped on trucks. When loaded to capacity these trucks are found to contain, on average, a net weight of wet soil equal to 13,000 lbs. In the construction process, the trucks dump their load on the fill, the material is spread and broken up, after which a sprinkler adds water until the water content is equal to 18%. The soil and water are thoroughly mixed by means of dicers (or other similar equipment) and then compacted until the dry unit weight γd=110 lbs/ft3 Helpful Conversions (3ft=1yd), (γw=62.4 lbs/ft3), (7.48gal/1ft3) a) Assuming that each load is a capacity load, how many truck loads are required to construct the fill? b) What is the volume in yd3 of material that must be removed from the borrow pit to construct the fill? c) How many gallons of water will have to be added per truck load assuming that the moisture lost by evaporation, hauling and handling is negligible? d) If the fill should become saturated at some time subsequent to construction and does not change volume appreciably, what will be its saturation moisture content? e) What will be the saturation moisture content if the soil swells to increase its original volume by 15%?
The Undisturbed soil at a given borrow pit is found to have the following parameters. The water content is 15%, the void ratio is 0.60 and the specific gravity of the solids is 2.70.
The soil from this borrow pit is to be used to construct a rolled fill having a finished volume of 50,000 yd3. The soil is excavated by means of a shovel and dumped on trucks. When loaded to capacity these trucks are found to contain, on average, a net weight of wet soil equal to 13,000 lbs.
In the construction process, the trucks dump their load on the fill, the material is spread and broken up, after which a sprinkler adds water until the water content is equal to 18%. The soil and water are thoroughly mixed by means of dicers (or other similar equipment) and then compacted until the dry unit weight γd=110 lbs/ft3
Helpful Conversions (3ft=1yd), (γw=62.4 lbs/ft3), (7.48gal/1ft3)
a) Assuming that each load is a capacity load, how many truck loads are required to construct the fill?
b) What is the volume in yd3 of material that must be removed from the borrow pit to construct the
fill?
c) How many gallons of water will have to be added per truck load assuming that the moisture lost by evaporation, hauling and handling is negligible?
d) If the fill should become saturated at some time subsequent to construction and does not change volume appreciably, what will be its saturation moisture content?
e) What will be the saturation moisture content if the soil swells to increase its original volume by 15%?
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