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The angle of internal friction for fines greater than 5% is ___________

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in Geotechnical Engineering II by (93.7k points)
The angle of internal friction for fines greater than 5% is ___________

(a) φ=25+0.15 ID

(b) φ=20+0.15 ID

(c) φ=15+0.15 ID

(d) φ=10+0.15 ID

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

My question comes from Geophysical Methods in section Stabilisation of Soils, Site Investigation and Sub – Soil Exploration of Geotechnical Engineering II

1 Answer

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by (243k points)
The correct choice is (a) φ=25+0.15 ID

Best explanation: Meyerhof in 1956 gave approximate values of φ with respect to density index ID. For fines greater than 5%, the general formula is,

φ=25+0.15 ID

where, φ=angle of internal friction

 ID= density index.

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