NIOSHTIC-2 Publications Search
Waterjet-assisted drag bit cutting in medium strength rock: a fundamental investigation.
Geier JE; Hood M; Thimons ED
Rock mechanics: proceedings of the 28th U.S. Symposium on Rock Mechanics, June 29 - July 1, 1987, Tucson, Arizona. Farmer IW, Dacmen JJK, Desai CS, Neuman SP, eds. Boston, MA: A. A. Balkema, 1987 Jun; :953-961
This paper presents hypotheses for the mechanism by which water jets reduce the specific energy of cutting for drag bits. Several of these are shown to be inconsistent with published evidence and new observations. The notion of a limiting cutting speed, above which water jets would be incapable of rendering assistance, was shown to be improbable. The hypothesis that seems most plausible is that specific energy reductions are mainly due to the erosion of crushed material from in front of the bit. This hypothesis leads to a prediction that, for a given rock type and jet-bit configuration at a constant depth of cut, the reduction in bit forces should be a function of dw/dx, the jet energy spent per unit length of cut. This dependence upon dw/dx is shown to be consistent with previously reported results.
Mining; Rock mechanics; Water sprays; Cutting tools; Force
OP; Conference/Symposia Proceedings
Farmer IW; Dacmen JJK; Desai CS; Neuman SP
Rock mechanics: proceedings of the 28th U.S. Symposium on Rock Mechanics, June 29 - July 1, 1987, Tucson, Arizona
CA; PA; AZ
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division