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8.0 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 S 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 />-10 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 />Y 1 _ 2(130) + 1(120)+.5(120) = 126 lbs/cf <br />3.5 <br />Waste Unit Weight Y2 = 70 lbs/cf <br />AVG Soil Friction Angle (01) <br />C <br />(10) <br />