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mt01_2 - The University of Iowa Department of Civil...

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The University of Iowa Department of Civil & Environmental Engineering SOIL MECHANICS 53:030 Midterm Exam, II (1 Hour) Fall 2001 Instructor: C.C. Swan Problem #1 : (25 points) An oil tank weighing 18,000 metric tons is to be supported on a square foundation mat 30m x 30m at a depth of 5m beneath the ground surface (see Figure 1). (a) Plot qualitatively but neatly, the motion of point A (which is directly beneath the center of the square foundation) from the time the excavation is started until the tank has been constructed and sitting in place for several years. Briefly explain your reasoning. (b) Calculate the average stress increase in the clay layer directly beneath point A. (c) How much settlement will have occurred from the tank loading after a period of 5 years? Recall that the increase in vertical stress at a depth z below the corner of a uniformly loaded flexible rectangular area is: = 3 , where: 3 is a function of the dimensionless parameters = and = and is provided the final page of this exam handout.
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