A small hydraulic excavator will be used to dig a trench in hard clay (bucket fill factor = 0.80). The minimum trench size is 0.6 m wide by 3.0 m deep. The excavator bucket available is 0.75 m wide and has a heaped capacity of 0.60 m³. The maximum digging depth of the excavator is 6.0 m. The average swing angle is expected to be 45°. Use the average value for trench production adjustment factor in Table 5. Required: Estimate the hourly trench production in linear meters if job efficiency is 70%. Hint: Start by determining the bank volume per meter of trench that would be excavated.
A small hydraulic excavator will be used to dig a trench in hard clay (bucket fill factor = 0.80). The minimum trench size is 0.6 m wide by 3.0 m deep. The excavator bucket available is 0.75 m wide and has a heaped capacity of 0.60 m³. The maximum digging depth of the excavator is 6.0 m. The average swing angle is expected to be 45°. Use the average value for trench production adjustment factor in Table 5. Required: Estimate the hourly trench production in linear meters if job efficiency is 70%. Hint: Start by determining the bank volume per meter of trench that would be excavated.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A small hydraulic excavator will be used to dig a trench in hard clay (bucket fill factor
= 0.80). The minimum trench size is 0.6 m wide by 3.0 m deep. The excavator bucket
available is 0.75 m wide and has a heaped capacity of 0.60 m³. The maximum digging
depth of the excavator is 6.0 m. The average swing angle is expected to be 45°. Use
the average value for trench production adjustment factor in Table 5.
Required:
Estimate the hourly trench production in linear meters if job efficiency is 70%.
Hint: Start by determining the bank volume per meter of trench that would be
excavated.
Table 5. Adjustment factor for trench production
Type of Material
Adjustment Factor
Loose (sand, gravel, loam)
0.60-0.70
Average (common earth)
0.90–0.95
Firm (firm plastic soils)
0.95-1.00
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