Ontology to identify the suitability of the foundation for structures.
Depth has to be greater than that of the Foundation in-order to be a Deep Foundation. Generally for structures with load >10t/m^2 , we go for deep foundations Pile Diameter(mm) Maximum length(m) 250 12 300 15 350 18 400 21 450 25
Terzaghi's Definition should be lesser than 1. Skempton's Definition should be lesser than 2. Depth should be less than or equal to Width of the foundation in-order to be a Shallow Foundation. Presumptive bearing capacity values as per IS1904-1978. Safe/allowable bearing capacity for various types of soil: (KN/ m2) Rock 3240 Soft rock 440 Coarse sand 440 Medium sand 245 Fine sand 440 Soft shell / stiff clay 100 Soft clay 100 Very soft caly 50