Study of Penetration Boundary Conditions in Percussive Rock Drilling

摘要

Tkis paper makes a synthetic analysis on the varying laws of four parameters of force, velocity, displacement and momentum, and indicates that rock fragmenting is not instantaneously produced but is by a process of accumulative damage. The relationship between incideut wave form and force-displacement ckaracteristfor is also inqulred into in this paper, and then it is proposed that conditions at the bit-rock interface cau be represeuted with displacement-impulse relationship.