Traditionally the CPT has not been used extensively for the calculation of vertical settlements due to foundations loads. Partly this has been due to the somewhat poor correlation between CPT results and soil modulus. However, significant recent improvements have been made that provide much better estimates of soil modulus from CPT results. This recent work was based on over 20 years of experience measuring shear wave velocity with the CPT (i.e. SCPT). It is now possible to make good estimates of soil modulus from CPT results over a wide range of uncemented soils, from soft clay to dense sands.

It is common practice in many parts of the world to estimate vertical settlement under footings using the simple one-dimensional formula:


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