Foundation-Pad and Strip System

Closely spaced pad or strip footings will improve the capacity of the adjacent footings compared to that of an isolated footing.

In coarse-grained soil, interaction of adjacent footings can be neglected when the centre-to-centre spacing is greater than 3 times the width for soil with friction angle of 30 degree, and 5 times the width if the friction angle is 40 degree.

In undrained soil, the limit is merely 1 times the width.

On the other hand, the overall settlement of foundation system increases when the interaction between adjacent footings is significant.



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