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Mass Diagrams

Mass Diagrams. Balance Cuts and Fills Shrink/swell Mass Diagram Cost Analysis. Cuts/Fills. Need to Balance Excess fill must be borrowed Excess cut must be wasted You pay for cut + waste or fill Haul Length Cost Effectiveness. Shrink/Swell. Most Common Excavation shrinks

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Mass Diagrams

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  1. Mass Diagrams • Balance Cuts and Fills • Shrink/swell • Mass Diagram • Cost Analysis

  2. Cuts/Fills • Need to Balance • Excess fill must be borrowed • Excess cut must be wasted • You pay for cut + waste or fill • Haul Length • Cost Effectiveness

  3. Shrink/Swell • Most Common Excavation shrinks • Embankment (Fill) placed at higher density • 1 cy cut yields < 1 cy fill • Varies from 5% - 20% • Depends on soil type • Factor of 1.2 is common • Rock excavation swells

  4. Mass Diagram • Cumulative total of cut/fill • Cut –> (+) • Fill -> (-) • Plot Cuml Total (cy) vs. location (Sta) • Mass Diagram peaks where profile changes from cut to fill

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