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Notes: <br /> • The geogrid should be placed at the base of the clay layer <br /> • The height of the waste exceeds the height of the soil arch and therefore <br /> the arching equation is valid and the effect of any surcharges at the top <br /> of the landfill can be ignored. <br /> B. Calculate the overlap distance <br /> FSP0LTADS <br /> L= <br /> 2C'NTanB <br /> L = Geogrid embedment length on each side of reinforcing zone(ft.) <br /> FSp =Factor of Safety for Pullout(dimensionless) <br /> FSS <br /> Ce =Pullout interaction coefficient(dimensionless) <br /> Ci = .58(see Table 1) <br /> N =Effective normal pressurc(lbs./sf.} <br /> N: One must consider the possibility of the loss of bearing capacity during <br /> the operational life of the landfill. A conservative assumption could be <br /> made that the normal force should be calculated with 2 feet of waste <br /> above.the liner system. <br /> = 3.5 ft.(126 lbs./cf.)+ 2 ft. (70 lbs./cf.)=581 Ibs/sf <br /> S = Effective friction angle of soil in contact with geogrid(degrees) <br /> S = Tan-I Tan250+Tan28° =26.50 <br /> 2 <br /> 1-5(1438) <br /> 2(.58)(58I)Ton26.50 - 6.5ft,-: <br /> Total overlap length=6.5 ft + 6 ft +6.5 ft = 19 ft. <br /> (14) <br />