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g 0 Design Example Problem (Cont) <br /> Decomposition and decay in the old landfill will impact the structural integrity at the <br /> foundation of the new landfill. A conservative assumption regarding bearing capacity will <br /> be analyzed to assure that the integrity of the liner system is not compromised. it will be <br /> assumed that a circular area with a 6 foot diameter looses all its bearing capacity at the <br /> base of the liner system. The strain limit on the project will be 5 percent to reflect a <br /> minimum factor of safety equal to 2. <br /> A. Determine the long-term allowable design strength of a single layer <br /> of uniaxial geogrid required to support the liner system in the new landfill. <br /> B. If no connector is available to transfer the ultimate tensile strength <br /> of the geogrid through a joint at the end of a roll, determine the <br /> overlap length required for the material. <br /> &I Design Example Solution <br /> A. Calculate long-term allowable design strength for the geogrid <br /> Parameters <br /> Soil Layer thickness H 1 = 3.5 ft. <br /> Waste Layer thickness H 2= 100 ft. <br /> Average Soil Unit Weight (y 1) <br /> YJ _ 2(130)+1(120)+.5(120) = 126 lbs/cf <br /> 3.5 <br /> Waste Unit Weight y 2 = 70 lbs/cf <br /> AVG Soil Friction Angle (01) <br /> (10) <br />