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Abstract By analyzing the intersection of discontinuity with slope surface，the classification of discontinuity and its trace in orientation with respect to slope is made. The feature triangle，with structure manifest，operation easy and relation simple，to determine intersection type of discontinuity with slope and pitch property of its trace is proposed by the comparison of planar projection with stereographic projection for them. By the concurrent and collineation principle of the orientating variables(elements of attitude)，the nomograph to determine pitch property of discontinuity trace is drawn，with which to illustrate the distribution of various intersection properties in the value space. The application of this nomograph should be helpful to collect and check on the locating and orientating data of discontinuities，and authentic evaluation of the structure of rock mass.
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Received: 01 July 2010
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2011, Vol. 30 
