Static cone penetration tests were carried out at a site by using an electric-friction cone penetrometer. The following data were obtained at a depth of 12.5 m.

cone resistance $q_{c}=19.152 MN / m ^{2}(200 tsf )$

friction ratio $R_{f}=\frac{f_{C}}{q_{c}}=1.3$

Classify the soil as per Fig. 9.16. Assume $\gamma \text { (effective) }=16.5 kN / m ^{3}$ .

Question

Static cone penetration tests were carried out at a site by using an electric-friction cone penetrometer. The following data were obtained at a depth of 12.5 m.

cone resistance [latex]q_{c}=19.152 MN / m ^{2}(200 tsf )[/latex]

friction ratio [latex]R_{f}=\frac{f_{C}}{q_{c}}=1.3[/latex]

Classify the soil as per Fig. 9.16. Assume [latex]\gamma ext { (effective) }=16.5 kN / m ^{3}[/latex].

Accepted Answer

The values of [latex]q_{c}=19.152 imes 10^{3} kN / m ^{2} ext { and } R_{f}=1.3[/latex]. From Eq. (9.15)

[latex]q_{c n}=q_{c}\left(1-1.25 \log p_{o}^{\prime} ight)[/latex] (9.15)

[latex]q_{c n}=200 imes 1-1.25 \log \frac{16.5 imes 12.5}{100}=121 tsf[/latex]

The soil is sand to silty sand (Fig. 9.16) for [latex]q_{c n}=121 tsf ext { and } R_{f}=1.3[/latex].

Question 9.8: Static cone penetration tests were carried out at a site by ...

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