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<br /> <br /> <br />DESCRIPTION s c o <br /> <br />FIELD IDENTIFICATION <br />APPROXIMATE <br />UNCONFINED <br />COMPRESSIVE <br />STRENGTH (MPa) <br />APPROXIMATE <br />UNCONFINED <br />COMPRESSIVE <br />STRENGTH (psi) <br />Very Low Strength Crumbles untlerfinn blows with point of <5.0 <700 <br /> geological hammer, can be peeled 6y a pocket <br /> knife <br />Low Strength Can be peeled by a pocket kn'rfe with dtlfiwlly, 5.0 - 25 700 -4,000 <br /> shallow Indentatlons made by firm hlow with polo/ <br /> of geological hammer <br />Motlerete Strength Cannot be scrapetl or peeled by a packet Imife, 25 - 50 4,000 - 7,000 <br /> spedmen can be /radured with a single blow of <br /> geological hammer <br />Medium High Strength Spedmen requires more than one bbw of 50- 100 7,000 - 15,000 <br /> geological hammer to fracture tt <br />High Strength Specimen requires many blows of geological 100-250 15,000-36,000 <br /> hammer to fredure it <br />Very High Strength SpeUmen can only be chipped with geological >250 >36,000 <br /> hammer <br />TERM DESCRIPTION <br />Fresh No visible signs of rock material weathering: perphaps slight discolomtron on major <br />tliscontinuity surfaces. <br />• <br />Slightly Weathered Slight penetration of discoloretion eway from fredure. Fractures may contain thin filling. <br />Moderetely Weathered Partial to complete dismlarefion away from fredure. Rock not friable except for poorly <br />cemented rock. FrecNres may contain thick filling. <br />Highly Weathered I All rock is discolored. Rock Is friable except for poorly cementetl rock. Corestones may be <br />present. <br />Completely Weatheretl ~ All rock is decomposed and/or disintegreted to soil. The original mass Is still largely intaU. <br />S S C O <br />DESCRIPTION SPACING (MM) SPACING (FT) <br />Extremely Close Spacing <20 <0.07 <br />Very Close Sparing 20 - 80 0.07 - 0.20 <br />Close SpaUng 80 - 200 0.20 - 0.86 <br />Medium Spacing 200-600 0.66-2.0 <br />Wide Sparing 600-2,000 2.0-8.8 <br />Very Wde SpaUng 2,000-6,000 8.8-20 <br />• <br />n <br />u <br />0 <br />0 <br />5 <br />0 <br />7 <br />I Reference: Brown, E.T., ed., 1981, Rock characterization <br />testing and monitoring ISRM suggested methods: New <br />York, International Society for Rock Mechanics <br />