Procedures Used for Sampling Fracture Orientations in an Underground Coal Mine.
Bolstad-DD; Alldredge-JR; Mahtab-MA
NTIS: PB 221 639 :9 pages
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.
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