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El <br />D <br />Shaw Environmental, Inc. <br />NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL, MODULE 4 <br />CHECK OF EXISTING LEACHATE COLLECTION PIPES <br />USING THE IMPROVED PIPE LOADING CALCULATION <br />REQUIRED: <br />METHOD: <br />REFERENCES: <br />Check if the existing 4 -inch diameter, SDR15.5, perforated HDPE pipes <br />are capable of supporting the proposed maximum waste height of 241 feet <br />Use the critical loading to analyze the pipe for the following four <br />design criteria: <br />1. Ring deflection <br />2. Pipe buckling <br />3. Wall crushing <br />4. Circumferential strain <br />1. Driscopipe, Product and Technical Information, 1991 <br />2. Wilson-Fahmy, R.F. and Koerner, R.M. (1994). Finite Element Analysis of Plastic Pipe <br />Behavior in Leachate Collection and Removal Systems, GRI Report #12. <br />3. Uni-Bell PVC Pipe Association (1997). Deflection: The Pipe/Soil Mechanism <br />4. Caterpillar Tractor Company, Caterpillar Performance Handbook, Edition 27, October 1996. <br />5. McGrath, T.J. (1998a). "Replacing E' with the Constrained Modulus in Buried Pipe Design." <br />Proceedings of the Conference, Pipelines in the Constructed Environment, ASCE. <br />6. McGrath, T.J. (1998b). "Calculating Loads on Buried Culverts Based on Pipe Hoop Stiffness." <br />Paper submitted to Transportation Research Board Committee A2C06 for presentation <br />at the 1999 Annual Meeting, Washington, D.C. <br />7. Koragappa, N. (2005). "Improvements to the Methodology Used for the Structural Design of <br />Leachate Collection Pipes," paper presented at the Waste Tech Landfill Technology <br />Conference, Las Vegas, May 2-3. <br />SOLUTION: <br />A. Pipe Properties <br />4 -inch dia., perforated, SDR 15.5, HDPE pi2e <br />thickness of pipe wall <br />inside diameter <br />outside diameter <br />SDR <br />mean diameter of pipe <br />mean pipe radius <br />t = <br />Di = <br />D,, = <br />SDR = <br />Dm= <br />R — <br />0.29 <br />in <br />in <br />in <br />1n <br />in <br />3.92 <br />4.5 <br />15.5 <br />4.21 <br />2.105 <br />N:\GEOTECHNICAL\NCRC&SL-2007\Pipe-Loading\Module 4\Module4_4lnchPipe_ImprovedMethod_24I fl.xls <br />Page I of 6 <br />