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AHIGHPOWERHYDRAULICDRILLFORBREAKINGHARDROCKFFVOITSEKHOVSKAYAUDC622012327UNLIKEOTHERMATERIALSSUCHASSTRUCTURALSTEELS,ROCKSHAVEAVERYINHOMOGENEOUSSTRUCTUREASINGLEROCKFRAGMENT,TOGETHERWITHVERYHARDINCLUSIONS,CONTAINSALSORELATIVELYSOFTPARTSATTHEBOUNDARIESBETWEENTHEHARDGRAINSMEASUREMENTSOFTHEMICROHARDNESSINANYDIRECTIONONAPOLISHEDSURFACEOFAROCKFRAGMENTGIVEVERYSCATTEREDREADINGSWEMAYENCOUNTERPOINTSWITHHARDNESSGREATERTHANTHATOFTUNGSTENCARBIDE,ANDAFRACTIONOFAMILLIMETERAWAYTHEREMAYBEAPOINTATWHICHTHEHARDNESSANDSHEARSTRENGTHFALLPRACTICALLYTOZEROANEXARNPLEOFAGRAPHOFTHEMICROHARDNESSOFAROCKALONGSOMEDIRECTIONOROTHERISILLUSTRATEDINFIG1,CURVECIFASIMILAREXPERIMENTTOMEASURETHEMICROHARDNESSWERECARRIEDOUTWITHSTEEL,WESHOULDSTILLFINDSOMESCATTEROFTHEREADINGS,BUTTHEAMOUNTOFSCATTERTHERATIOOFTHEMAXIMUMHARDNESSTOTHEMINIMUMWOULDBESEVERALORDERSOFMAGNITUDELESSFIG1,CURVED\1\ASTUDYOFTHEEFFECTSOFINHOMOGENEITYOFROCKISTHEMAINPREREQUISITEFORELUCIDATINGTHEPOSSIBILITYOFOBTAININGADURABLETOOLASTHELOADINGAREAOFAROCKINCREASES,THEREI
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