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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= <br /> 2C®NTan.S <br /> L = Geogrid embedment length-on each side of reinforcing tone(R.) <br /> FSp =Factor of Safety for Pullout(dimensionless) <br /> FSP = 1.5 <br /> C; =Pullout interaction coefficient(dimensionless) <br /> C; = .59(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 lbslsf <br /> S = Effective fiction angle of soil in contact with geogrid (degrees) <br /> S = Tan-1 Ta�r250+Tan280 =2650 <br /> 2 <br /> L = 1-5(1438) <br /> 2(.58)(581)Tan26S0 <br /> Total overlap length=6.5 ft + 6 R +6.5 ft = 19 R. <br /> (14) <br />