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Bulkhead Design for AMD Page 20 October 27-29, 1998 <br />Figure 3. Compressive strength results, Chandler Tunnel. <br />50D <br />Compression Test Results <br />~ = 7.0° <br />cohesion = 57 psi <br />400 <br />..-. <br />.y <br />Q <br />r 300 <br />C <br />L <br />M~ <br />N <br />i 200 <br />LL <br />100 <br />Failure Strength(psi) = 129 + 1.278(Confining Pressute-psi) <br />rz = 0.998; S~ = 6 psi; T~ = 32.798(»99°h) <br />0 <br />0 25 50 75 100 125 150 175 200 <br />Confining Pressure (psi) <br />330 Chandler Adit Bulkhead <br />- 20 - <br />