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The height of the free fall in sample in standard penetration test is ___________

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+1 vote
in Geotechnical Engineering II by (93.8k points)
The height of the free fall in sample in standard penetration test is ___________

(a) 50 cm

(b) 75 cm

(c) 100 cm

(d) 150 cm

This question was posed to me in an interview for job.

This intriguing question originated from Geophysical Methods topic in division Stabilisation of Soils, Site Investigation and Sub – Soil Exploration of Geotechnical Engineering II

1 Answer

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by (243k points)
Right option is (b) 75 cm

To elaborate: In standard penetration test, the thick wall split-tube sampler is driven into the undisturbed soil at the bottom of the hole under the blows of a 65 kg drive weight with a free fall of 75 cm or 30 inches.

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