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  Prediction of Reaming Performance of Inclined Raises Using Pilot Hole Drilling

  Appropriate performance prediction of Raise Boring Machines (RBMs) in feasibility and planning stage of mechanized shaft excavation projects directly effects the economics of the projects and job completion time. This study aims to develop empirical performance prediction models for inclined reaming operations by using pilot hole drilling and reaming operational parameters and physical-mechanical properties of rock samples. Field performance of the pilot hole drilling and reaming operations are collected in 3 different raise excavation projects (Balya, Efemcukuru and Adiyaman) in Turkey. Then, some important physical-mechanical properties of the obtained rock samples from the field are determined in the laboratory. The evaluation indicates that weight on bit of pilot hole drilling with rotational speed of reaming and P-wave velocity of the rocks could be used to predict the field specific energy of reaming.

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