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Rock Mass Rating <br />Strength Envelopes <br />• ~ooo <br />900 <br />800 <br />700 <br />600 <br />• <br />y <br />a <br />N <br />n 500 <br />N <br />400 <br />300 <br />soo <br />100 <br />• <br />Job No. 23,585 <br />0 <br />0 <br /> ~ <br /> V. Go d _ . <br />y.,, <br /> <br /> <br /> Y ~ <br /> ~. <br /> <br /> , . <br /> , <br />r <br /> <br />, <br />, <br /> GDOd ~ <br />^ <br />/ <br />! ' <br />+ <br /> <br />, I <br /> '' <br />• <br /> / <br />/ 'I ' <br /> <br /> l <br /> ' <br />r ' ~ Phi=24, C=4psi <br /> <br />it <br />' s <br /> <br />e . <br />•~ <br /> . <br />. <br /> <br />~ <br /> .- T I <br /> <br /> f <br /> -- <br />~ <br />. I r <br />,' <br />t <br />~ <br />100 200 300 400 500 600 700 B00 9C0 1000 <br />Normal Stress (psi) <br />Fig. ~-3 <br />