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.

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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The site soil consists of loose sand that are dry within the top 3 m and saturated below. The present blow counts ranging between 2 and 10. Due to concerns regarding liquefaction dynamic compaction is proposed. The soil should be improved to a depth of 10 m. A 20-ton tamper with a diameter of 1.5 m and a height of 1.5 m is available. Assume a square pattern. More than one pass may be required. Estimate: 1. The required drop height 2. Spacing of the drops 3. Number of drops required 4. Number of passes required 5. SPT blow counts after improvement, and 6. Settlement.
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