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Figure 6. Variation of damping ratio with shear strain for Sand-01.
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Figure 7. It is found that upto 30% silt, liquefaction resistance
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Cyclic StrengthRatio
Silt Content (%)
100
LimitingFineContent
AxialStrain±3%,at 20Cycles
Effectivestress=100
kPa,Dr=60%,
f =
1Hz
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5 CONCLUSIONS
Cyclic strength ratio, shear modulus reduction curve and
damping reduction curve were determined for a local fine sand
containing 11% silt. Wet tamping method was used to prepare
specimen of relative density 55%. Cyclic strenght ratio at 50
kPa confining pressure was found to be 0.315. Shear modulus
decreased with increasing shear strain and damping ratio
increased with increasing shear strain. Most interesting finding
is that upto 30% silt, liquefaction resistance of sand decrease
with increasing silt content. Above 30% silt, liquefaction
resistance of soil had insignificant variation with silt content.
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