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Tunneling Machine Research - Size Distribution of Rock Fragments Produced by Rolling Disc Cutters.

Authors
Rad-PF; Olson-RC
Source
NTIS: PB 233 414 :40 pages
Link
NIOSHTIC No.
10001732
Abstract
The Bureau of Mines used a linear cutting apparatus equipped with a 7-inch disk cutter to cut grooves in marble, limestone, granite and quartzite under a normal force of 7,000 lb. The size distribution of the muck for various grooves was determined through sieve analysis. A statistical search showed that weibull distribution describes the size distribution better than other available functions. Results indicate that fineness modulus, chip population, and dimension of the largest chip can be used as indicators of cutting efficiency. The results correlate with those obtained from the boring machines and other laboratory experiments. Application of the principles established through this work to the operation of boring machines is explained.
Publication Date
19740101
Document Type
IH; Report of Investigations
Fiscal Year
1974
NTIS Accession No.
PB-233414
NTIS Price
A04
Identifying No.
RI 7882
NIOSH Division
ALRC;
Source Name
NTIS: PB 233 414
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