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Shaw Environmental, Inc. <br />NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL, MODULE S 5 THROUGH 110 _ <br />DESIGN OF LEACHATE COLLECTION PIPES <br />USING THE IMPROVED PIPE LOADING CALCULATION <br />D. Pipe Buckling <br />Acceptable factor of safety = `J <br />The critical buckling pressure, P,, in psi, is given by, <br />P.. = 0.55M,. EY 11 1 Y2 <br />, <br />C 0.149R� <br />Therefore, factor of safety (FS) against pipe buckiling, <br />Unit Initial <br />Lona, -Term Note <br />Pcr (psi) 835 <br />358 - <br />61 (psi) 194 <br />110 <br />FS = Pc�6i - 4.31 <br />3.25 F.S. is Acceptable <br />E. Wall Crushing <br />0 Acceptable factor of safety = <br />Ienorin- bending, the axial stress Ps,, in psi is given by, <br />PsA = 6 , <br />Therefore, factor of safety (F.S.) against wall crushing, <br />Unit Initial <br />Lona, -Term Note <br />PSA (psi) 1211 <br />689 - <br />PA (psi) 3000 <br />1440 <br />FS = PA/PSA - 2.48 <br />2.09 F.S. is Acceptable <br />v <br />N:\GEOTECHNICAL\NCRC&SL-2007\Pipe-Loadin-\Modules5-I IW15-11_41nchPipe_SDR 13.5_255ft.xls Page 5 of 6 <br />