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Geotechnical Engineering
Yan-feng Zhuang
Associate Professor
in Geotechnical Engineering
School of Civil Engineering
Wuhan University
Wuhan 430072
P.R. zhuan
Particle Size
Particle-size distribution curve
• Equivalent opening size:
D10, D25, D30, D60, D75
• Uniformity coefficient (C ):
u
C =D /D
u 60 10
• Coefficient of gradation (C ):
c
2
C =(D ) /(D ×D )
c 30 60 10
• Sorting coefficient (S0):
S =(D /D )0.5
0 75 25
Semilogarithmic plot
Percent finer as the ordinate (arithmetic scale) and
Sieve opening size as the abscissa (logarithmic scale)
Particle-size distribution curve
• Curve I poorly graded soil
• Curve II well graded soil
Uniformity coefficient greater than about 4 for gravels and 6 for
sands, and a coefficient of gradation between 1 and 3 (for gravels
and sands)
• Curve III gap graded soil
Particles of some grain sizes are missing. It is a combination of
two or more uniformly graded fractions
Sieve ysis
Hydrome nalysis
Hydrome nalysis is based on Stokes’law. Soil particles are
assumed to be spheres and settle at velociti
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