This report presents the results of two parallel field investigations consisting of utility trench backfill compaction tests. The field investigation at State College, Pa. was conducted to establish baseline measurements using a walk-behind vibratory roller compactor and a lift thickness of 8 inches. These baseline measurements were compared to measurements from a field investigation at Harrisburg, Pa. using a hydraulic plate compactor and varied lift thicknesses. The effects of hydraulic plate compactor use and lift thickness on the ability to consistently achieve a minimum specified standard Proctor density of trench backfill, compaction-induced downward earth pressure in the backfill zone, and compaction-induced longitudinal and hoop strains in typical pipes are discussed. A recommendation regarding the lift thickness for hydraulic plate compactors is provided.
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United States Department of Transportation
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