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.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter15: Retaining Walls, Braced Cuts, And Sheet Pile Walls

Section: Chapter Questions

Problem 15.24P

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A temporary excavation, with a 1 horizontal on 2 vertical slope, is to be performed in a stratum of clay 100 ft thick with an undrained shear strength of 2000 psf. The total unit weight of the clay is 125 pcf. If the safety factor must be at least 2.0, what is the maximum permissible depth of the excavation?
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