a 2 m wide square foundation is placed at a depth of 1.5 m, in a very thick homogeneous sand deposit where qc 5 10 mn/m2 and g 5 18.5 kn/m3. the stress level at the foun- dation is 140 kn/m2. estimate the settlement in 25 years, using the method of schmertmann et al. [eq. (9.30)]. how 9.17 much of this settlement is due to creep?