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Tunneling Machine Research - Interaction Between Disc-cutter Grooves in Rocks.

Authors
Rad-PF; Olson-RC
Source
NTIS: PB 233 413 :21 pages
Link
NIOSHTIC No.
10001731
Abstract
The Bureau of Mines conducted groove cutting experiments in marble, limestone, granite, and quartzite with a 7-inch disk cutter under a normal thrust of 7,000 lb. The values of muck weight per unit length, specific energy, cutting coefficient, and groove depth for each of these rocks were determined for groove spacings ranging from 0.1 to 4 inches, and from these results the values of optimum and critical spacing were computed. The results indicate that compressive strength may be used to predict some of the cutting characteristics of the independent grooves. Considering all the cutting characteristics, particularly those for the interacting grooves, shore hardness, coefficient of rock strength, and torsional velocity correlate with cutting characteristics better than do other physical properties. Some of the field applications of the principles established in this report are identified.
Publication Date
19740101
Document Type
IH; Report of Investigations
Fiscal Year
1974
NTIS Accession No.
PB-233413
NTIS Price
A03
Identifying No.
RI 7881
NIOSH Division
ALRC;
Source Name
NTIS: PB 233 413
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