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Analysis of Fracture Orientations for Input to Structural Models of Discontinuous Rock.

Authors
Mahtab-MA; Bolstad-DD; Alldredge-JR; Shanley-RJ
Source
NTIS: PB 212 696 :76 pages
Link
NIOSHTIC No.
10000814
Abstract
This report presents a new procedure for analyzing the orientations of rock fractures in an engineering site. This procedure, coded in a computer program, identifies clusters or groupings among the fracture orientations and calculates (1) the mean orientation of the fractures within each cluster and (2) the dispersion or scatter among these fracture orientations. Data points are represented by intersections of joint normals with the upper hemisphere, which is divided into 100 equal-area quadrilateral patches. The points in adjacent patches where the poisson distribution test shows significant concentrations are assigned to a single cluster. For a cluster whose fracture orientations follow arnold's hemispherical normal distribution, a confidence interval for the fracture orientation mean is calculated by applying fisher's estimates. The technique is applied to the treatment of three examples.
Publication Date
19720101
Document Type
IH; Report of Investigations
Fiscal Year
1972
NTIS Accession No.
PB-212696
NTIS Price
A06
Identifying No.
RI 7669
NIOSH Division
SRC;
Source Name
NTIS: PB 212 696
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