A Stereographic Method of Determining Whether Planes of Weakness Transect Pillars.
NTIS#: PB 271 220 :17 pages
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.
IH; Report of Investigations
NTIS Accession No.
NTIS#: PB 271 220