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Question: a plate bearing test using a 12indiameter rigid plate is...

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2.3 A plate bearing test using a 12-in.-diameter rigid plate is made on a subgrade, as shown in Figure P2.3a. The total load required to cause settling by 0.2 in. is 10,600 lb. After 10 in. of gravel base course is placed on the subgrade, a plate bearing test is made on the top of the base course, as shown in Figure P2.3b. The total load required to cause settling by 0.2 in.is 21,200 lb. Assuming a Poisson ratio of 0.5, determine the thickness of base course required to sustain a 50,000-lb tire exerting a contact pressure of 100 psi over a circular area, as shown in Figure P2.3c, yet maintain a deflection of no more than 0.2 in. IAnswer: 70 in.] 50,000 lb 10,600 lb 21,200 lb 100 psi Rigid Plate Deflects 0.2 in wo 0.2 in Base 10 in 12 in Subgrade E2 Subgrade E2 (a) (b) (c) FIGURE P2.3

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