Given: A small hydraulic excavator will be used to dig a trench in common earth (bucket fill factor = 0.95). The minimum trench size is 0.6 m wide by 2.5 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 5.0 m. The average swing angle is expected to be 90°. 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.

Given: A small hydraulic excavator will be used to dig a trench in common earth (bucket fill factor = 0.95). The minimum trench size is 0.6 m wide by 2.5 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 5.0 m. The average swing angle is expected to be 90°. 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.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Pricing Excavation and Backfill

Backfill, in construction, is the activity of returning the soil and gravel that are removed during building construction or using them again to toughen and support the foundation of the building or any other structural component.

Question

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

Given:
A small hydraulic excavator will be used to dig a trench in common earth (bucket fill
factor = 0.95). The minimum trench size is 0.6 m wide by 2.5 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 5.0 m. The average swing angle is expected to be
90°. 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.

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