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Rock strength anisotropy is studied by comparing point-load test results in vertical (axial) <br />and horizontal directions (diametric). As illustrated in figure 6, the rocks are <br />approximately half as strong in the horizontal direction as vertically. This is shown in <br />figure 6, where values are scattered around a 2:1 ratio line. This magnitude of strength <br />anisotropy is very typical for rocks in the Somerset basin and is in agreement with past <br />measurements by Atlantic Richfield Company. The lower strength in the horizontal <br />direction is attributed to the presence of bedding planes. <br />Point Load Test <br />30000 <br />25000 <br /> <br />.N 20000 <br />CL <br />r <br />rn <br />c <br />N <br />V <br />0 15000 <br />E <br />0 <br />a <br />a <br />m <br />m <br />J 10000 <br />5000 <br />0- <br />0 <br />2:1 Line--' <br />5000 10000 15000 20000 25000 30000 <br />Axial point load strength, psi <br />0 Figure 6. Axial and lateral point-load strengths are compared. <br />Maleki Technologies, Inc. Page 16