Blind Zones and Aspect Ratio Bias in Acquisition of Discontinuity Orientation Data

摘要

Characterizaion of discontinuities such as faults, shears, and joints in a rock mass is an integral part of many geotechnical data acquisition programs. Discontinuity orientations are in practice measures in rock core samples or are mapped from rock exposures. Data sets thus obtained are biased because of blind zones associated with each borehole or mapping surface. This paper quantifies the extent of blind zones and outlines a procedure for treating aspect ratio bias. 4 figures. (ERA citation 09:038657)