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Shaw Environmental, Inc. NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL, MODULE S 5 THROUGH 11 DESIGN OF LEACHATE COLLECTION PIPES USING THE IMPROVED PIPE LOADING CALCULATION Assuming the gravel bedding to meet the hyperbolic model parameters for Soil No. 5 in Table 3 of Wilson-Fahmy, 1994 (note that the table is based on Selig, 1990), the curve fitting for the hyperbolic model from Figure I above, l M., = 1483 (61 )0.34 Therefore, M, = 8412 psi Account for Arching (based on McGrath, 1998b) Based on McGrath (1998b), the vertical arching factor for no -slip condition is given by, VAF= 1.06-0.96 Sy —0.7 SH +1.75 N:\GEOTECHNICAL\NCRC&SL-2007\Pipe-Loadin,-\Modules5-11\M5-1 I_4lnchPipe_SDR13.5_255ft.xls Page 3 of 6 25000 Note: Refer to Table 3 of GRI Report #12 for soil numbers and corresponding hyperbolic model parameters ® Soil No. 3; Ms = 2289 (6,)017 20000 CL N 15000 S o Soil No. 5; Ms = 1483 (a,)074 v N 10000 O v ■ Soil No. 8; Ms = 2338 ((T,)U 17 5000 Soil No. 14 Soil No. 19 0 0 100 200 300 400 500 Vertical Stress, a, (psi) Figure 1. Variation of Constrained Modulus with Vertical Stress for Various Soil Types Based on Hyperbolic Stress -Strain Model Assuming the gravel bedding to meet the hyperbolic model parameters for Soil No. 5 in Table 3 of Wilson-Fahmy, 1994 (note that the table is based on Selig, 1990), the curve fitting for the hyperbolic model from Figure I above, l M., = 1483 (61 )0.34 Therefore, M, = 8412 psi Account for Arching (based on McGrath, 1998b) Based on McGrath (1998b), the vertical arching factor for no -slip condition is given by, VAF= 1.06-0.96 Sy —0.7 SH +1.75 N:\GEOTECHNICAL\NCRC&SL-2007\Pipe-Loadin,-\Modules5-11\M5-1 I_4lnchPipe_SDR13.5_255ft.xls Page 3 of 6