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Expert Answer

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  Hi,

  Solution as follows:

  1. Load factor

  From Table 1,

  Load factor for clay (L) = 0.77

  2. Bucket fill factor

  From Table 2,

  Bucket fill factor for hard clay (F) = 0.65 to 0.95

  Average value of (F) = 0.80

  3. Swing depth factor

  Given Data:

  · Depth of excavation = 5 ft

  · Maximum Digging Depth = 16 ft

  · Angle of swing = 85 deg

  % Depth of cut = 5/16 = 0.31 = 31%

  From Table 3,

  Swing depth factor for 30% depth and 75⁰ = 1.21

  Swing depth factor for 30% depth and 90⁰ = 1.15

  Swing depth factor for 30% depth and 85⁰ (S) = 1.19

  4. Cycles per hour

  From Table 4,

  Cycles per hour for hard clay with medium excavator (n) = 130

  5. Adjustment factor

  From table 5,

  

  6. Productivity

  Given Data:

  · Heaped capacity of bucket (C) = 2 CY

  · Efficiency E = 85%

  Production in BCY per hour can be calculated by below formula:

  

  Hope the same is clear. In case of any clarifications, please leave comment in comments section.

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  Chegg Expert Team

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