Chapter 4, Problem 4.6QPP

A standard penetration test was performed in a 150 mm diameter boring at a depth of 9.5 m below the ground surface. The driller used a UK-style automatic trip hammer and a standard SPT sampler. The actual blow count, N, was 19. The soil is a normally consolidated fine sand with a unit weight of $18.0{\text{kN/m}}^{\text{3}}$ and $D_{50}=0.4\text{mm}\text{.}$ The groundwater table is at a depth of 15 m. Determine the following:

1. $N_{60}$
2. $N_{1,60}$
3. $D_r$
4. Consistency (based on Table 3.3)
5. $\varphi \text{'}$