Example Problem 8.13 Solve the above example problem by using the layered soil chart
(Fig. 4.16). Assume the sand layer (z 0 to 10 m) and the clay layer (z 10 to 12 m) have a
Poisson’s ratio of 0.25 (i.e., m1 m2 0.25) and the value of k E1E2 10.
Solution From Example Problem 8.11, turning the rectangular foundation into an equivalent
round foundation:
B 2r 28 m or r 14 m