Modeling impact fracture of rock by hydraulic hammer pick with regard to its bluntness

Destruction of rocks and artificial composites is carried out in various ways. One the most common methods impact fracture. The conical pick JCB HM380 hydraulic breaker was used as tool. experimental study rock fracture on an composite—concrete. depth penetration into concrete test parameter. model based Professor V. B. Sokolinsky. The developed this work takes account degree bluntness tool insingle multiple impact. system considered a two-component due to high stiffness pick–granite contact (as against hammer piston–pick stiffness). wave processes were disregarded because small length pick. calculated theoretically, using mathematical model, at each pick, then compared with data. tests also concrete. determined from step-frame analysis video filming process. It found that blunting causes monotonic increase resistance penetration, both single impact, while blow time decrease initial state tool, by 28% 20%, respectively).