(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.

(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.

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 15.22P

See similar textbooks

Similar questions

An ASD downward column load of 500 k is to be supported on a group of drilled displacement piles constructed in the following soil profile: Depth (ft) Soil Description Unit Weight(lb/ft3) Undrained ShearStrength (lb/ft2) Effective FrictionAngle (deg) 0–15 Silty sand 120 32 15–40 Clayey silt 112 500 40–60 Clay 110 600 60–70 Silty clay 112 1100 70–90 Sandy silt 114 1800 The groundwater table is at a depth of 15 ft. Determine the required number of piles, their diameter, and their length. No static loadtests have been conducted. Note that there are many solutions to this problem, but select a design that you feel is most appropriate.
What is the best probable production in lcy/hr for a 3 cy hoe excavating poorly blasted rock? Assume a 50- minute hour efficiency.
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.
A limestone mine has the following equipment at its primary production face: Excavator: a 15 yd3 (11.5 m3) front-end loader with 40 sec cycle time Trucks: five 100 ton (90 tonne) trucks Material: average blasted rock with medium-hard digging conditions Working conditions: average Haulage cycle time: 20.0 min (a) What is the sustained production rate of the system in tons/hr, assuming 60 min of production per hour'? (b) Which equipment (loader or trucks) governs? (c) What improvements would you recommend to increase mine production without changing equipment?
An exploratory drill hole was made in a stiff saturated clay having a moisture content of 38.9% and Gs = 2.34 as shown in the figure. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 13.8 ft above the top of sand layer. If an open excavation is to be made in the clay, determine the (a) unit weight of the clay, and the (b) maximum cut before the bottom heaves.
Describe about the Typical earth tieback, Anchor is located outside potential failure zone.
The excavation shown below will be made on the clay for the construction of a highway. Potential Slope stability analysis is required on the slip plane. The ground is silty clay and c '= 18 kPa,' '= 20o and water = 100 kPa. At point a If the shear stress is 60 kPa, calculate the safety coefficient for this point.
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 circular pile having a diameter of 0.33 m is 14.21 m long which is embedded in a layer of dense compacted sand having the given properties. Soil properties: Lateral pressure factor, K = 3.53 Nq = 99 Specific gravity, Gs= 2.61 Void ratio, e =1.21 Saturation above the GWT = 0.41 Ground water table (GWT) is located 3.58 m below the ground. Use unit weight of water = 9.81 kN/m3 Coefficient of friction = 0.41 Factor of safety = 3.98 Calculate the allowable capacity of the pile in kN.
-for Shovel Excavator: Soil Type = dry clay, Excavation time = 4 days, Daily shift = 10 hours, Excavation heigh = H = 3.10 m, Rotation Angle = α1 = 45° State of work and management = good , Distance to dump = L = 5.500 m. -for Truck: Speed with the load = V = 30km/h, Speed without the load = Vr = 50km/h, Loading time = 2min, Dumping time = 2min. -THE AMOUNT OF SOIL IS 4800 m3 Q=Find the needed excavator. And the needed truck and its amount.
A shovel with a 4-cy heaped capacity bucket is loading poorly blasted rock. The average height of face is 16. 5 ft and the maximum digging height of the machine is 33 ft. The haul unit can be positioned only at 180 degrees swing angle. Assume optimum height for the machine as 50% and rock material swells 60%. If the efficiency is 50 min per hour, calculate:1. The shovel production in bcy per hour ----2. The operation cost per bcy if cost of shovel including wages is $116.00 per hour ------
Question 1 State whether true or false; if false, explain why: a. Buoyancy is the factor that decreases the actual weight of the drill string. b. The three major operational parameters are bit load, bit rotation and circulation rate. c. Adequate upward velocity of drilling mud is necessary to carry the cuttings outside the hole. d. Horizontal drilling is the most difficult drilling system. e. Drilling is the operation by which the drill string is forced into the rocks by the cutting action of the rock bit at the