NIOSHTIC-2 Publications Search

Waterjet-assisted drag bit cutting in medium strength rock: a fundamental investigation.

Authors
Geier JE; Hood M; Thimons ED
Source
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
NIOSHTIC No.
10005743
Abstract
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.
Keywords
Mining; Rock mechanics; Water sprays; Cutting tools; Force
Publication Date
19870629
Document Type
OP; Conference/Symposia Proceedings
Editors
Farmer IW; Dacmen JJK; Desai CS; Neuman SP
Fiscal Year
1987
ISBN No.
9789061916994
Identifying No.
OP 93-87
NIOSH Division
PRC
Source Name
Rock mechanics: proceedings of the 28th U.S. Symposium on Rock Mechanics, June 29 - July 1, 1987, Tucson, Arizona
State
CA; PA; AZ
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division