5.5 Earth whose in situ weight is 105 lb/cf and whose compacted weight is 122 lb/cf is placed in a fill at the rate of 260 cy/hr, measured as compacted earth. The thickness of the compacted layers is 7 in. A roller having a drum width of 50 in operates at a speed of 2 mph. Assume a 55-min hour operating efficiency. Determine the number of rollers required to provide the necessary compaction if four passes are specified for each layer of earth.
5.5 Earth whose in situ weight is 105 lb/cf and whose compacted weight is 122 lb/cf is placed in a fill at the rate of 260 cy/hr, measured as compacted earth. The thickness of the compacted layers is 7 in. A roller having a drum width of 50 in operates at a speed of 2 mph. Assume a 55-min hour operating efficiency. Determine the number of rollers required to provide the necessary compaction if four passes are specified for each layer of earth.
Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN:9781337705028
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter2: Geotechnical Properties Of Soil
Section: Chapter Questions
Problem 2.4P
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5.5 Earth whose in situ weight is 105 lb/cf and whose compacted weight is 122 lb/cf is
placed in a fill at the rate of 260 cy/hr, measured as compacted earth. The thickness of the
compacted layers is 7 in. A roller having a drum width of 50 in operates at a speed of 2
mph. Assume a 55-min hour operating efficiency. Determine the number of rollers
required to provide the necessary compaction if four passes are specified for each layer of
earth.
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Compaction: The method used for densification of soil to press the soil particles by mechanical methods so that air voids are removed is known as Compaction.
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