Foundations on Strong Sand Overlying Weak Sand

The ultimate bearing capacity of footings on subsoil consisting of a strong sand layer overlying a weak sand deposit was investigated. A theory was developed and then results predicted. These predictions compared well with test data on model strip and circular footings resting on dense sand overlying loose, as well as, compact sand. Design charts are presented for use in practical application. Based on these charts, a procedure to determine the ultimate bearing capacity of a strip and circular footings on a strong sand layer overlying a weak sand deposit is described.