Table 2: Typical calculation showing 𝑁 𝑐 values obtained from 𝑁 values.

Depth (m) SPT value ( 𝑁 e l d ) Unit weight (kN/m3) Total stress
(T.S. (kN/m2))
Effective stress (kN/m2) 𝐶 𝑁 Correction factor F.C. 𝐶 n e s SPT value ( 𝑁 c o r r e c t e d )
Hammer effectBoreholediaRod lengthSample method

1.501119.1028.6528.651.4811.050.75154.51.43118
4.001219.1076.4076.401.1211.050.851591.48218
6.003019.10114.60114.600.9411.050.95153.61.30937
7.507419.10143.25143.250.8411.050.95129.81.14371