Tire center of a rectangular area at ground surface has Cartesian coordinates (0, 0), and the corners have coordinates (7,18). All dimensions are iu metres. The area carries a uniform pressure of 150 kPa. Estimate the stresses at a depth of 20 m below ground surface at each of the following locations: (0,0), (0,18), (7,0), (7, 18), and (12, 28); obtain values by both Boussinesq and Westergaard methods, and also determine the ratio of the stresses as indicated by the two methods. (After Taylor. 1948.)
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