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• Vertical Stress Distribution on the B Seam, Development <br />Stress, psi <br />7000 <br />4000 <br />3500 <br />3000 <br />2500 <br />2000 <br />1500 <br />1000 <br />500 <br />250 <br />100 <br />0 <br />• <br />• <br />Stress, psi <br />7000 <br />4000 <br />3500 <br />3000 <br />2500 <br />2000 <br />1500 <br />1000 <br />500 <br />250 <br />100 <br />0 <br />Figure 2. Vertical stress distribution on the Upper B Seam (top), development and (bottom), <br />simulated longwall retreat mining. <br />Maleki Technologies, Inc. <br />Page 9 <br />Vertical Stress Distribution on the B Seam, Retreat