4. A crawler hoe having a 2 %-cy bucket and whose cost per hour, including the wages to an operator, is $67, will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 20 ft. Determine the cost per bank cubic yard for each condition. (Condition 1. 300 bey/hr, $0.223/bey, Condition 2.319 bey/hr, $0.210 bey; Condition 3. 128 bey/hr, $0.523/bey) Condition Material Depth of excavation (ft) Angle of swing (degrees) Percent swell Efficiency factor (min-hr) 45 (1) (2) Moist loam, earth Sand and gravel Rock, well blasted 12 16 14 60 80 120 14 50 45

4. A crawler hoe having a 2 %-cy bucket and whose cost per hour, including the wages to an operator, is $67, will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 20 ft. Determine the cost per bank cubic yard for each condition. (Condition 1. 300 bey/hr, $0.223/bey, Condition 2.319 bey/hr, $0.210 bey; Condition 3. 128 bey/hr, $0.523/bey) Condition Material Depth of excavation (ft) Angle of swing (degrees) Percent swell Efficiency factor (min-hr) 45 (1) (2) Moist loam, earth Sand and gravel Rock, well blasted 12 16 14 60 80 120 14 50 45

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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Choose the lowest size and the required number of crawler hoes to excavate 828864 b-Cyd of sand & gravel in 4 months. A size one Cyd excavator (including the wage's operator) costs $80 /hr. with an increment of $5 per extra 0.5 Cyd. Depth of excavation 12 ft, Swell 25%, and efficiency 65%. Suppose the work is 8hr/day. Estimate the total expected cost.
Q1- Determine the allowable bearing load of the pile shown in figure Q1 using all the possible methods of solution. Mention the method used, and draw clear labeled drawings to clarify your calculations.
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3. A hydraulic backhoe cuts a building basement that is uniformly 18-ft deep. The bottom of the basement is 80-ft x 130-ft, and the soil is OSHA Type B, common earth. Its heaped bucket capacity is 3.7-LCY. Job efficiency is 45-min/hr. The machine’s maximum 8-ft level cutting depth is 24-ft. You note that hauler access to position effectively is limited, so on average the site will permit a swing angle of 90-degrees between excavator cut and hauler bed. A. Determine the production rate in LCY/hr. B. Determine the duration in hours of the basement excavation activity.
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Q.3/A Crawler hoe having a three Cyd bucket and whose cost per hour, including the wage to an operator, is $95 will excavate and load haul units under each stated condition. The maximum digging height of the machine is (25 ft.). Determine the cost of one cubic yard for each condition. Condition 1 2 3 Material Depth of excavation Percent swell Angle of swing Efficiency factor (min/hr) Sandy clay Hard clay Rock, well blasted 18 15 35 90 50 10 20 60 45 60 90 50 4 Sand & gravel 20 13 150 55
List the general types of pile drive hammers in use, and provide a brief description of the basic operating principle for each.
A 3 m deep excavation will be supported by a cantilever sheet pile. The foundation soil is dense sand, but it is assumed that the pile tip penetrates impermeable soil so hydrostatic pore pressure can be used. A surcharge of 10kPa is applied at the ground level. The water table is at the ground surface and dredge line as shown. Use Yw=10kN/m³ for your calculations. a) Using a factor of safety of 2.0 for Kp, check if D'=5m is safe or not (no need to iterate for other D'). b) Calculate the maximum bending moment. H=3.0m D.L. =+% D'=5m? 10 kPa G.L. Dense sand 3 Yt=20.0 kN/m³ c'=0 Ka=0.2 Kp=6.0 Impermeable soil
Geotechnical
7. A 12m long concrete pile with diameter = 0.45m is drilled into normally consolidated clay with S, = 90 kPa and friction angle = 32 degrees. The pile is loaded with 300 kN and in response to such loading, it settles 2.5mm. What is the mobilized short term end bearing resistance? Show your work and circle your answer.
2. Determine the balanced hauls and indicate the direction of haul for the mass diagram shown below. The LPH is 4,000 ft. Also, show on the profile what cut sections will be hauled to what fill sections, and indicate any borrow or waste sections. Calculate the average haul distance for each. balanced haul.. 75000 50000 25000 0 -25000 -50000 -75000 0 Distance along centerline, ft 14000 15000