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A Stereographic Method of Determining Whether Planes of Weakness Transect Pillars.

Authors
Trouseull-JA
Source
NTIS#: PB 271 220 :17 pages
Link
NIOSHTIC No.
10001781
Abstract
The Bureau of Mines has developed a simple stereographic method of analyzing the orientation of single and intersecting planes of weakness in vertical pillars of parallel symmetry. From this method, it can be determined if planes of weakness transect the full horizontal cross section of a pillar. A major finding resulting from this method was that intersecting planes of weakness can transect the full horizontal cross section of a pillar even though the individual planes do not. This paper provides step-by-step instructions for using this method.
Publication Date
19770101
Document Type
IH; Report of Investigations
Fiscal Year
1977
NTIS Accession No.
PB-271220
NTIS Price
A03
Identifying No.
RI 8232
NIOSH Division
DRC;
Source Name
NTIS#: PB 271 220
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