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Tunnel Boring Technology. Disk Cutter Experiments in Sedimentary and Metamorphic Rocks.

Authors
Morrell-RJ; Bruce-WE; Larson-DA
Source
NTIS: PB 193 982 :32 pages
Link
NIOSHTIC No.
10001725
Abstract
Disk-cutter experiments were performed on five rock types ranging in compressive strength from 9,000 psi to 27,000 psi. A specially constructed testing machine called a linear-cutter apparatus (lca) was designed to load and traverse a free-rolling disk cutter across a sawed rock surface. The lca was instrumented to measure the vertical and horizontal forces acting on the cutter during the run. The ability of disk cutters to fragment rock was determined for both 60-degree and 90-degree cutting-edge angles, and relationships and regression equations were developed to predict cutter performance based on rock physical properties and applied forces.
Publication Date
19700101
Document Type
IH; Report of Investigations
Fiscal Year
1970
NTIS Accession No.
PB-193982
NTIS Price
A04
Identifying No.
RI 7410
NIOSH Division
TCRC;
Source Name
NTIS: PB 193 982
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