Abstract
In a great majority of mechanized excavation works, the low efficiency of hard rock breaking is a major obstacle to the rapid advancement of project. Due to the existence of polyacrylamide (PAM), abrasive slurry jets (ASJs) are being applied in the field of hard rock breaking because of their high crushing capacity. This study investigates the effects of slurry properties and working parameters on rock cutting performance by ASJ, then the cutting resistance and specific energy (SE) of rock breaking using conical pick assisted with ASJ were analyzed. The results show that the cutting depth of nonionic PAM as additive is better, the cutting depth increased with the increase of PAM molecular weight and concentration. The rock cutting depth increases with the increase of jet pressure and decreases with the increase of target distance and transverse velocity. When rock breaking using conical pick assisted with ASJ, the mean cutting resistance of pick increases with the increase of traverse velocity, the SE first decreases and then increases, while the mean cutting resistance and SE decrease with the increase of jet pressure.
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