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Procedures Used for Sampling Fracture Orientations in an Underground Coal Mine.

Authors
Bolstad-DD; Alldredge-JR; Mahtab-MA
Source
NTIS: PB 221 639 :9 pages
Link
NIOSHTIC No.
10000576
Abstract
The Bureau of Mines has developed procedures for sampling the geometry of fractures in underground coal mines. Stratified cluster sampling and the unit area concept are applied to the collection of fracture orientation data. The use of unit area mapping, stratification, and site delineation is made to assure collection of representative data. The procedures developed here help to isolate sources of variability in the fracture patterns.
Publication Date
19730101
Document Type
IH; Report of Investigations
Fiscal Year
1973
NTIS Accession No.
PB-221639
NTIS Price
A02
Identifying No.
RI 7763
NIOSH Division
SRC;
Source Name
NTIS: PB 221 639
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