PERMFILE135086

• Permit No: C1981038
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Geotechnical Review
• Section_Exhibit Name: Volume 6 PHASE I STABILITY ANALYSES Appendix
• Media Type: D
• Archive: No

h1ETHOD OF ROCK STRUCTURE ANALYSIS
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THE ORIENTATION OF IMPORTANT PLANES OF MECHANICAL DISCONTINUITIES IN
A ROCK MASS, COMMONLY KNOWN AS THE ROCK STRUCTURE, CAN BE CONVENIENTLY
REPRESENTED AND EVALUATED BY USING A COMPUTER PROGRAM. THE COMPUTER
PROGRAM PLOTS A SCATTER DIAGRAM OF THE POLES OF ALL MEASURED DISCONTINUITIES
ON AN EQUAL AREA PROJECTION. IT THEN PERFORMS A STATISTICAL ANALYSIS BY
CONTOURING THE DENSITY OF THESE PLOTS.
ON AN EQUAL AREA PROJECTION, EQUAL AREAS ON THE REFERENCE SPHERE
CORRESPOND TO EQUAL AREAS ON THE NET INDEPENDENTLY OF THEIR POSITION ON
THE SURFACE OF THE SPHERE. CONTOURING OF THE POLES IS THEREFORE PER-
FORMED BY MOVING A COUNTING CIRCLE OF FIXED RADIUS OVER THE SURFACE OF THE
NET AND COUNTING THE NUI4BER OF PLOTTED POINTS IJHICH FALL WITHIN THE
CIRCLE AT EACH LOCATION. THE AREA OF THE COUNTING CIRCLE IS 1 PERCENT THAT
OF THE NET. CONTOUR INTERVALS ARE SELECTED ACCORDING TO THE MAXIMUM
DENSITY OF POINTS AND ARE PRINTED AT THE TOP OF THE CONTOUR DIAGRAM. THE
CONTOURED DIAGRAMS PROVIDE THE QUANTITATIVE BASIS NECESSARY FOR THE
ANALYSIS OF THE STABILITY OF ROCK MASSES.
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