Testing of intact rock for strength 2 1 uniaxial compression recall the typical stress strain response curve for a specimen of intact rock under uniaxial compression see figure 1 in lecture notes 5. Granite 24 gpa shale 1 6 gpa limestone 24 gpa chalk 3 2 gpa sandstone 0 4 gpa steel 80 gpa wood 4 gpa glass 19 gpa lithostatic pressure gradient 26 46 mpa km for 2 70 hydrostatic pressure gradient 9 8 mpa km unconfined compressive strength granite 100 250 mpa basalt 100 300 mpa quartzite 150 300 mpa sandstone 20 170 mpa. The international society for rock mechanics isrm standard terminology for ucs is very low 5 mpa low 5 25 mpa moderate 25 50 mpa medium 50 100 mpa high 100 250 mpa and very high 250 mpa.
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