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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 />L = <br />FS F° LTADS <br />2C, NTanS <br />L = Geogrid embedment length on each side of reinforcing zone (ft.) <br />FSJM = Factor of Safety for Pullout (dimensionless) <br />rSPO = 1.5 <br />C, = 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 finer 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 />S = Tan_ 1Tan25°+Tan28° = 2650 <br />z <br />_ 1-5(1438) <br />L 2(58)(581)Tan265o <br />Total overlap length = 6.5 ft + 6 ft + 6.5 ft = 19 ft. <br />(14) <br />L <br />