For the oil tank problem in Chapter 10 (Problem 10.16), plot the complete total, total-uo, and effective stress paths due to construction and filling of the tank for an element under the centerline of the tank and at the midpoint of the clay layer. Assume that Ko at the site is 0.7 and that the average value of the A parameter before failure is 0.4; assume A f = 0.5. Make reasonable estimates of the strength parameters, and estimate the factor of safety against failure.