Research present situation and analysis on classification of rock drillability

Rock drillability reflects the drill bit fragments rock hardly or easily. At present, rock drillability classification indexes have rock single-axle compressive strength, point load intensity, fracture stress during chiseling, drill speed, chiseling specific work, acoustic parameter, cutting magnitude and so on, Every index reflects rock drillability but isn't overall. It is feasible that using many indexes of fuzzy mathematics method etc. to evaluate rock drillability.