Question

Problem 4. This problem relates to the Henkel solution that was handed out in class. A tied-back wall is to be built to hold open a 30 ft deep excavation. The soil pushing on the wall has total unit weight of 125 lb/ft and undrained (short term) strength of 750 lb/ft?. a) If the soft soil is underlain by a layer of very stiff and strong soil, what is the estimate of the short-term coefficient of lateral earth pressure (K) and the estimate of the active force applied by the soil to the wall (P2)? b) If the soil is underlain by a further 10 ft of soil with the same properties, what is Henkel's estimate of KA and PA?

Answer 1