5. A crawler hoe having a 3-cy bucket and whose cost per hour, including the wages to anoperator, is $86, will excavate and load haul units under each of the stated conditions.The maximum digging depth of the machine is 25 ft. Determine the cost per bank cubicyard for each condition.Condition(1)(2)(3)(4)MaterialSandy clayHard clayRock, wellblastedSand and gravelDepth of excavation (ft)Angle of swing (degrees)106088181520909000150Percent swellEfficiency factor (min-hr) 455024205050553513

Answered: Image /qna-images/answer/739ef406-72cb-4922-96b0-2ec00851b2dd.jpg

Answered: 5. A crawler hoe having a 3-cy bucket…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter18: Pile Foundation

Section: Chapter Questions

Problem 18.13P

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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.
. (25 points) A CAT 385FCS shovel is loading well-blasted rock (Fill Factor=85%) on a highway project. The average face height is expected to be 22’. Most of the cut will require a 150 degree swing of the shovel to load the haul units. What is a conservative production estimate in bcy/hr if the swell is 60%? Assume a 50-min/hr efficiency. Cycle time under ideal conditions is 35s. The optimum digging height (or depth) is 50% of the maximum digging height (or depth). To use table: Percentage of optimum height = Average Face Height/ Optimum Digging Height HINTS: Obtain required dimensions of the shovel from CAT44, Chapter 7. No need to interpolate from given table. Use closest value.
What are the advantage of the augered-excavation cast-in-place piles?
Please solve all the three a,b,c as soon as possible. A trench is to be excavated in a clay soil with γsat =20 kN/m3 and su=15 kPa.(a) Determine the theoretical maximum depth of thetrench without lateral support.(b) It was decided to use a bentonite slurry of unitweight γf to fill the trench as excavation proceeds.Show that the theoretical maximum depth of thetrench is Hcr = 4su / γsat - γf where γsat is the saturatedunit weight of the soil and su is the undrainedshear strength.(c) How much deeper can the trench be excavated byusing a bentonite slurry of γf= 11 kN/m3?
Define the types of piles on the basis of their function with sketches.
Read the question carefully and give me answer according to the question Describe situations in which drilled shafts would be preferable to driven pile foundations
State the method to determine the N-value of soil and the normal N-value required for supporting friction piles
Assuming that each load is a full-capacity load, howmany truckloads are required to construct the fill?
A concrete pile 30 cm diameter is driven into a medium dense sand(φ = 35°, γ = 21 kN/m3), k = 1.0, tan δ = 0.7, Nq = 60). For a depth of 8m, Find the safe load. Taking a factor of safety of 2.5, if the water table rises to 2 m below the ground surface take γw = 10 kN/m2. Assume necessary data if available
A large sign is to be supported on two steel poles, each of the poles which will besupported by a 500 mm diameter drilled shaft embedded into a stiff silty clay. The lateralwind load will be 5.4 kN and will act at a height of 8 m above the ground surface. Thisload will be equally distributed to the two poles. Assume the undrained shear strength forstiff silty clay is 80 kPa. Assume a factor of safety of 3. Using a rigid analysis (Brom’sMethod), 1) compute the required depth of embedment and 2) the maximum moment ineach drilled shaft.
Be aware of the problems that may occur during excavation and techniques to control them
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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