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Width B of footing (m) Figure 5.5. Terzaghi and Peck's correlation between allowable bearing pressure and SPT blow count in sand

Figure 5.6 shows Stroud and Butler's correlation -between standard penetration test blow count (N), undrained shear strength (cu), and plasticity index (Ip) of clays - which is widely used in the UK. The relationship shown is typical of correlations that are likely to survive Figure 5.6. Stroud and Butler's correlation between the introduction of SPT blow count and undrained strength of fine soil Eurocode 7, since it involves no use of safety factors and so can be used unmodified.

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