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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 /> FS LTADS <br /> L= p° <br /> 2Cl NTanB <br /> L = Geogrid embedment length on each side of reinforcing zone(ft.) <br /> FSP® =Factor of Safety for Pullout(dimensionless) <br /> l•'SP = 1.5 <br /> Ci = Pullout interaction coefficient(dimensionless) <br /> C; = .58 (see Table 1) <br /> N =Effective normal pressure(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 /> N = 3.5 ft.(126 lbs./cf.)+ 2 ft. (70 lbs./cf.)= 581 lbs/sf <br /> S = Effective friction angle of soil in contact with geogrid (degrees) <br /> 8 = <br /> Tan—' Tan250+14n280 _26.50 <br /> 2 <br /> L _ 1.5(1438) =6.5 ft. VV ''.. <br /> 2(38)(581)Tan26.5° <br /> Total overlap length = 6.5 ft + 6 ft +6.5 ft = 19 ft. <br /> (14) <br />