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OBJECTIVES: <br />GIVEN: <br />ASSUMPTIONS: <br />CALCULATIONS: <br />RECOMMENDATIONS: <br />CushionMcimalDuign doc <br />Subject Whirlwind Project <br />Ore Stockpile Pad Liner System <br />Cushion Material Design <br />Made by KFM <br />Checked by 0 <br />Approved <br />Job No 073 -81745 <br />Date <br />01/10/08 <br />Sheet No 1 of 8 <br />Design the minimum thickness of Cushion Material to be placed above the proposed geosynthetic clay <br />liner (GCL) for the Ore Stockpile Pad liner system at the Whirlwind Mine. <br />Maximum size of equipment anticipated to travel over the liner system is a Caterpillar Model 950H <br />Wheel Loader with an operating weight of 40,345 pounds and a maximum bucket capacity of 4.5 cubic <br />yards (Loader specifications are attached). <br />• Maximum stress allowed on the liner is 8 pounds per square inch (psi); <br />• Assume that the loader is full with material having a unit weight of 110 pounds per cubic foot (pcf), <br />providing a gross loaded weight of approximately 53,800 lb; <br />• Assume that 55 percent of the total weight is supported on the front axle (i.e., 29,590 lb); and <br />• Assume point loading at one of the front tires, with additional stress applied by the second front tire <br />at an assumed distance of 9.5 feet. <br />Stresses imposed on the liner were evaluated using the Boussinesq Method. The attached spreadsheet <br />provides the results of the stress calculation at the first front tire (page 1), and the additional stress <br />imposed from the second front tire (page 2), at the location of the first front tire. <br />A stress equivalent to, or less than, the recommended design stress of 8 psi is achieved by placement of a <br />cushion material with a minimum thickness of 2.5 feet. <br />