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~i <br /> <br />CJ <br />c• <br />NOTES: <br />W =WEB WIDTH <br />D =AUGER DIAMETER (WIDTH) <br />T =COAL SEAM THICKNESS <br />YH = OVERBURDEN PRESSURE <br /><1c =ALLOWABLE COAL STRESS <br />FS = FACTOR OF SAFELY <br />WEB WIDTH TO HEIGHT RATIO ~ W/D <br />EXTRACTION PERCENTAGE <br />BASED ON FULL SEAM <br />THICKNESS (T). <br />Qp-PEAK STRESS BASED ON ELASTIC <br />STRESS DISTRIBUTION FOR AN <br />UNLINED CIRCULAR OPENING <br />Qa -AVERAGE WEB STRESS <br />__ D <br />r Qc ~ <br />L (FSXYH) - <br />AVERAGE STRESS <br />WEB WIDTH <br />CALCULATION <br />O_c <1.2 <br />Qp <br />CHECK FOR PEAK <br />STRESS FACTOR <br />OF SAFETY <br />CTL(THOMPSON, INC. <br />CONSSULTING ENGINEERS <br />GEOTEGiNMX f EMIRONMEMN./ W1FRyd5 <br />,o~, r. ~xrN AvENU[, oo~n, caaN.po emw <br />TYPICAL <br />AUGER FACE VIEW <br />COLOWYO MINE, MOFFAT COUNtt, CO. <br />JOB N0. 23,585 FIG. A-3 <br />