Soil Exploration - Examples & Applications

Example Problems

Example Problem 1: Calculate the corrected N-value

(N_1)_{60}

given the following field data:

Raw field blow count, $N_{field} = 15$ .
Depth of test = 6m in a uniform sand layer with $\gamma = 18 \, kN/m^3$ . The water table is very deep.
Hammer Efficiency $\eta_H = 45\%$ (Typical for older Donut hammers).
Assume Borehole, Sampler, and Rod length correction factors are all equal to 1.0.

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Example Problem 2: A standard penetration test (SPT) was conducted in a dense sand layer at a depth of

6 \, m

. The blow counts for three successive intervals were

8

12

, and

15

. The groundwater table is located at a depth of

2 \, m

. The soil has a dry unit weight of

17 \, kN/m^3

above the water table and a saturated unit weight of

20 \, kN/m^3

below. The test was conducted using a US safety hammer with an energy efficiency of

60\%

. Calculate the fully corrected SPT value.

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Example Problem 3: A thin-walled Shelby tube sampler with an outside diameter of

50.8 \, mm

and an inside diameter of

47.6 \, mm

is used to extract a clay sample. Calculate the Area Ratio of the sampler and determine if the sample is considered undisturbed.

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