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IL <br />Shaw Environmental, Inc. <br />NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL, MODULE 1 <br />CHECK OF EXISTING LEACHATE COLLECTION PIPES <br />USING THE IMPROVED PIPE LOADING CALCULATION <br />D. Pipe Buckling <br />Acceptable factor of safety = 0 <br />The critical buckling pressure, P,, in psi, is given by, <br />1y <br />P.. = 0.55�M . EP 11 <br />' 0.149R' J <br />Therefore, factor of safety (FS) against pipe buckling, <br />Unit Initial Long -Term Note <br />PC,. (psi) 515 221 - <br />t51 (psi) 106 67 <br />FS = P,,Iu - 4.88 3.28 F.S. is Acceptable <br />E. Wall Crushing <br />Acceptable factor of safety = <br />Ignoring bending, the axial stress PS,A in psi is given by, <br />6� .D <br />Pin = <br />2A« <br />Therefore, factor of safety (F.S.) against wall crushing, <br />Unit Initial <br />Lon, --Term Note <br />PSA (psi) 765 <br />487 - <br />PA (psi) 3000 <br />1440 - <br />FS = PA/PSA - 3.92 <br />2.96 F.S. is Acceptable <br />N:\GEOTECHNICAL\NCRC&SL-2007\Pipe-Loading\Module 1&2\Modulel&2_31nchPipe_ImprovedMethod_148ft.xls <br />Page 5 of 6 <br />