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An underground limestone mine with production of 12,000 tons/day will use trucks for the main haulage between an ore pass and a hoist skip pocket. The hauling distance is 5500 ft. The main haulage drift is horizontal and is 12.5 ft wide and 12.5 ft high. The trucks will be loaded from an ore chute with a loading rate of 300 tons/hr. The mine employs two 10-hr working shifts. Overall job conditions are assessed as severe. The limestone has bank density of 0.0795 tons/ft3 and swell factor of 0.59. Select the type and size of the truck needed, and calculate the size of the truck fleet needed. Make and justify all assumptions needed (clearances, turning radius and other factors).
A 45-cm-thick, 300-cm-high lightweight concrete masonry unit wall lies on a 20-cm-thick lightweight plain concrete slab. The 20-cm wide slab is supported by a reinforced concrete beam, which is placed on top of two columns (simply supported beam).
Calculate the resistance coefficient K for a ball-type check valve placed in a 2-in schedule 40 steel pipe carrying 650 gal/min of oil (sg = 0.90)
Assuming an isotropic and homogenous hydraulic conductivity of 0.0001 cm/s what is the magnitude and direction of specific discharge (q)?
A hawk flying at 2 m/s at an altitude of 45 m accidentally drops its prey. The parabolic trajectory of the falling prey is described by the equation below until it hits the ground, where y is its height above the ground and x is its horizontal dis..
Draw the shear diagram for the shaft. The bearings at and exert only vertical reactions on the shaft
A 600 MWe power plant has an efficiency of 36% with 15% of the waste heat being released to the atmosphere as stack heat and the other 85% taken away in the cooling water.
The steel ball is suspended from the accelerating frame by the two cords A and B. Determine the acceleration a of the frame which will cause the tension in A to be twice that in B.
Name three types of metamorphic foliations, and draw a small sketch that shows a situation where a metamorphic foliation could cause problems in an excavation.
A train 552 m long is moving on a straight track with a speed of 88.5 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 13.7 km/h.
A vertical curve is to connect two tangents that intersect at station 30+50 at an elevation of 800.00 ft. The approach gradient is 3 percent and the departure gradient is -5 percent. The elevation of the curve at station 32+50 must be equal to at ..
Determine the critical depth in a trapezoidal channel with a 20 foot bottom width and 3:1 (H:V) side slopes if the Q = 1000cfs.
Briefly explain the difference between piezometer and tensiometer with respect to the working principle, special design consideration and limitation of the instrument.
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