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<br />Id <br />Company Name- Bogie Mains, Terror Creek Czossrng <br />Stress Conditions Crosscut <br />Be F-/ 7-771 st. - <br />Moderate Entry <br />- Most Difficult <br />Azimuth of Sigma H 90 degze.•,, <br />Magnitude of Sigma H. 1500 p, <br />Depth of Cover. S00 feet <br />Azimuth of Entries 100 degt• <br />E.igure 14. Schematic presentation ofentry and CroSSCUt conditions. <br />At BR1. properties. the horizontal stresses are moderate and not excessive when <br />compared to the strength of most roof rocks. The existing orientation of the mains <br />(N 100 E) is favorable for reducing horizontal stress-induced damage along the entries in <br />the corridor because the entries are oriented within 20 degrees from the maximum stress <br />orientation. The crosscuts would be at a disadvantage and would benefit from additional <br />support. This is illustrated in figure 14 using a computer program by N*lOSll (AHSEM <br />2003). CrosSCUI stability could also be Improved by using angled crosscuts so that the <br />crosscuts would be located in the white zone, indicated by the "moderate" Condition in <br />figure 14. This can be achieved b-y using,, 70 degree crosscuts (instead of90 degrees). <br />0 <br />Malcki Technologies. Inc. <br />Page 27 <br />*77