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Page I <br /> project: Forward Landfill By: RMO Date: 9/5/01 <br /> Project Number. Check: Date: <br /> Description: Leachate Collection Pipe Loading <br /> Purpose: Determine if the selected leachate collection pipe has adequate strength. <br /> Pipe Specs: Slotted HDPE pipe with the following characteristics is propsed for use: <br /> Diameter� 6 inchcs <br /> DR= 7 <br /> Slot Width= 0.1 inches <br /> Slot Spacing= 1.1 inches O.C. <br /> Landfill Data: Max.height= 200 feet <br /> Waste density= 48.15 pcf 1300 <br /> Calculations: Loading of flexible pipes is analyzed using the Iowa Deflection Formula: <br /> %deflection=D1 *Kp(f 00)/(0.149*F/delta Y+0.061 E1) where: <br /> Allowable%deflection for HDPE pipe= 1.75 <br /> 0.149*F/delta Y=2*E/(3 *(DR-I)^3)= 410.49 <br /> DI=Deflection Lag Factor= 1.5 (Sharma&Lewis) <br /> K-Bedding Constant= 0.083 (Sharma&Lewis) <br /> P=Pipe Loading in psi:waste height*density/144= 66.9 <br /> AWL F/delta Y=Pipe Stiffness in psi <br /> El=Modulus of Soil Reaction in psi= 3000 (Shauna&Lewis) <br /> E=Modulus of Elasticity of Pipe in psi= 133000(Sharma&Lewis) <br /> DR=Dimension Ratio of Pipe=OD/t= 7 <br /> %deffeei 1.4 ,not allowing for a reduction in pipe strength due to slots. <br /> Effect of Sloffirt' <br /> A method of evaluating the impact of pipe slots on the strength of the pipe is to reduce the <br /> stength of a unit length of pipe by the cumulative width of slots within the unit length. This <br /> method is conservative as it neglects the contribution of the pipe material remaining at <br /> Slot locations. <br /> n o a o <br /> o a a a <br /> -- No strength is assumed for this ring of the pipe. <br /> Reduction in strength=slot width /slot spacing= 0.090909 percent <br /> Reduced stregth term(0.149*F/delta Y)of Iowa Equation= 373.18 <br /> %deflect 1.5 ,considering a reduction in pipe strength due to slots. <br /> Conclusion: The specified pipe is : Acceptable <br /> J;Staoisy�{petoadlLAad 1.xlsShcetl <br />