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tion rate of 2.1 ft/min. Assume that it takes 5 mi ills use 12-ft steel. The blasting pattern will be 8 drilling. The average depth to finish grade is 18 f tion must match that of the loading and hauling

tion rate of 2.1 ft/min. Assume that it takes 5 mi ills use 12-ft steel. The blasting pattern will be 8 drilling. The average depth to finish grade is 18 f tion must match that of the loading and hauling

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter19: Drilled Shaft
Section: Chapter Questions
Problem 19.1P
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A project in coarse-grain sandstone is being investigated. Field drilling tests proved that air-track drills with 4-in. B bits can achieve a penetration rate of 2.1 ft/min. Assume that it takes 5 min to change a bit. The drills use 12-ft steel. The blasting pattern will be 8 x 10 ft with 2 ft of subdrilling. The average depth to finish grade is 18 ft. The drilling production must match that of the loading and hauling operations, which is 320 bcy/hr. Assuming a 45-min production hour drilling, how many drill units will be required?
Transcribed Image Text:A project in coarse-grain sandstone is being investigated. Field drilling tests proved that air-track drills with 4-in. B bits can achieve a penetration rate of 2.1 ft/min. Assume that it takes 5 min to change a bit. The drills use 12-ft steel. The blasting pattern will be 8 x 10 ft with 2 ft of subdrilling. The average depth to finish grade is 18 ft. The drilling production must match that of the loading and hauling operations, which is 320 bcy/hr. Assuming a 45-min production hour drilling, how many drill units will be required?
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