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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 /> 2Cf NTan.6 <br /> L = Geogrid embedment length.on each side of reinforcing zone(ft.) <br /> FSP =Factor of Safety for Pullout(dimensionless) <br /> rSp = l.5 <br /> Ci =Pullout interaction coefficient(dimensionless) <br /> C, .59 (see Table1) <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 /> a = Effective friction angle of soil in contact with geogrid (degrees) <br /> S = Tan-1 Rw250+Tan28* =2630 <br /> 2 <br /> 1.5(1438) <br /> L - 2(58)(581)Ton2630-6Sf1.1; <br /> Total overlap length=6.5 ft +6 ft +6.5 ft = 19 ft. <br /> (14) <br />