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  Effect of Operational Parameters on the Performance of Raise Boring Machine During Pilot Drilling

  Raise Boring Machines (RBMs) are the fast, safe and efficient drilling / boring machines are used for different purposes in mining and tunnelling especially for excavation of vertical and/or inclined shafts and drifts. The optimum raise boring system is designed or selected based on drilling / excavation performance, which depends mainly on mechanical (machine related), geological / geotechnical and operational parameters.This study aimed to investigate the effect of operational parameters (length of shaft and labor experience) on the performance of a RBM (machine utilization time, daily advance, net pushing force, instantaneous penetration rate, unit penetration, net cutting rate, consumed tricone bit torque as well as consumed tricone bit power, and field specific energy) during the pilot drilling of two shafts in the Balya lead-zinc underground mine. The lengths of first and second shafts were 210.26 and 335.32 m, respectively. The inclination of these shafts was 69o and 68o, respectively. The pilot drill diameter of the two shafts were both 0.311 m. The field investigations indicated that increasing the length of shaft decreased the overall performance of raise boring operation.

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