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• <br />TERM I DESCRIPTION <br />• <br />Fresh No visible signs of rock material weathering: perphaps slight discoloration on major <br />discontinuity surfaces. <br />Slightly Weathered Slight penetration of discoloration away from fracture. Fractures may contain thin filling. <br />Moderately Weathered Partial to complete discoloration away from fracture. Rock not friable except for poorly <br />cemented rock. Fractures may contain thick filling. <br />Highly Weathered I All rock is discolored. Rock is friable except for poorly cemented rock. Corestones may be <br />present. <br />Completely Weathered I All rock is decomposed and /or disintegrated to soil. The original mass is still largely intact. <br />°3. RJR 9 � p � 1 <br />DESCRIPTION <br />�, <br />W <br />SPACING (FT) <br />Extremely Close Spacing <br /><20 <br /><0.07 <br />Very Close Spacing <br />APPROXIMATE <br />APPROXIMATE <br />0.07-0.20 <br />Close Spacing <br />UNCONFINED <br />UNCONFINED <br />DESCRIPTION <br />FIELD IDENTIFICATION <br />COMPRESSIVE <br />COMPRESSIVE <br />0.66-2.0 <br />Wide Spacing <br />STRENGTH (MPa) <br />STRENGTH (psi) <br />Very Low Strength <br />Crumbles under firm blows with point of <br /><5.0 <br />2,000 - 6,000 <br />6.6-20 <br />geological hammer, can be peeled by a pocket <br />knife <br />Low Strength <br />Can be peeled by a pocket knife with difficulty, <br />5.0-25 <br />700-4,000 <br />shallow indentations made by fine blow with point <br />of geological hammer <br /><700 <br />Moderate Strength <br />Cannot be scraped or peeled by a pocket knife, <br />25-50 <br />4,000 - 7,000 <br />specimen can be fractured with a single blow of <br />geological hammer <br />Medium High Strength <br />Specimen requires more than one blow of <br />50-100 <br />7,000 - 15,000 <br />geological hammer to fracture it <br />High Strength <br />Specimen requires many blows of geological <br />100-250 <br />15,000 - 36,000 <br />hammer to fracture it <br />Very High Strength <br />Specimen can only be chipped with geological <br />>250 <br />>36,000 <br />hammer <br />TERM I DESCRIPTION <br />• <br />Fresh No visible signs of rock material weathering: perphaps slight discoloration on major <br />discontinuity surfaces. <br />Slightly Weathered Slight penetration of discoloration away from fracture. Fractures may contain thin filling. <br />Moderately Weathered Partial to complete discoloration away from fracture. Rock not friable except for poorly <br />cemented rock. Fractures may contain thick filling. <br />Highly Weathered I All rock is discolored. Rock is friable except for poorly cemented rock. Corestones may be <br />present. <br />Completely Weathered I All rock is decomposed and /or disintegrated to soil. The original mass is still largely intact. <br />°3. RJR 9 � p � 1 <br />DESCRIPTION <br />SPACING (MM) <br />SPACING (FT) <br />Extremely Close Spacing <br /><20 <br /><0.07 <br />Very Close Spacing <br />20-60 <br />0.07-0.20 <br />Close Spacing <br />60-200 <br />0.20-0.66 <br />Medium Spacing <br />200-600 <br />0.66-2.0 <br />Wide Spacing <br />600-2,000 <br />2.0-6.6 <br />Very Wide Spacing <br />2,000 - 6,000 <br />6.6-20 <br />• <br />Reference: Brown, E.T., ad., 1981, Rock characterization <br />testing and monitoring ISRM suggested methods: New <br />York, International Society for Rock Mechanics <br />PAN <br />Revision No.: PR -03 <br />