A site in central Cambridge rarely tells the whole story from the surface. The underlying geology shifts abruptly, and what holds firm for a terrace gravel near Castle Hill may be entirely different 600 metres east where the Fenland alluvium begins. The local building control expectations are shaped by this variability. A shallow foundation design here demands more than textbook bearing capacity; it requires a ground model that accounts for the shrink-swell potential of the Gault Clay and the compressibility of silty floodplain deposits. Before a single line of structural detail is committed to paper, the subgrade must be unequivocally understood. The borehole and trial pit data that feed a CPT test in the Cambridge area frequently expose soft lenses that would otherwise compromise a standard strip footing. The design process starts with that data, not after it.
A shallow foundation in Cambridge is a settlement calculation first and a bearing capacity check second. The ground dictates that order.
