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Shaw Environmental, Inc. <br />NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL, MODULE 3 <br />CHECK OF EXISTING LEACHATE COLLECTION PIPES <br />USING THE IMPROVED PIPE LOADING CALCULATION <br />F. Circumferential Strain <br />Allowable Long-term Strain = 1 51% <br />The total circumferential strain is a combination of: <br />(i) strain due to ring deflection or flexure, Ef <br />(ii) strain due to hoop stress, Eh <br />(iii) strain due to Poisson's effect corresponding to longitudinal strain, cp <br />Ignoring longitudinal strain, <br />F=Ef+Eh <br />Where, <br />0,011 = 1.08 % <br />s _ 6 D„ <br />2 t . E,, <br />eh = 0.0245 = 2.45 % <br />Therefore, total circumferential strain, <br />F = Ff + Eh = 3.53 % Strain is Acceptable <br />SUMMARY: <br />Design Criteria <br />Acceptable Value <br />Computed <br />Conclusion <br />Rina Deflection (%o) <br />3.88 Maximum <br />3.85 <br />Acceptable <br />Factor of SafetX Against Pipe Buckling <br />2.00 Minimum <br />2.99 <br />Acceptable <br />Factor of SafetX Against Wall Crushing <br />2.00 Minimum <br />2.67 <br />Acce table <br />Long-term circumferential Strain (%) <br />5.00 Maximum <br />3.53 <br />Acceptable <br />t.7 <br />N:\GEOTECHNICAL\NCRC&SL-2007\Pipe-Loading\Module 3\Module3_4lnchPipe_ImprovedMethod_I65ft.xls Page 6 of 6 <br />