while performing direct shear test on silty sand , initially friction angle decreases with increase moisture content but when the plastic limit of soil is reached Friction angle starts to increase.
Justyna Adamczyk
Hi,
It is important what is the share of the gravel fraction in this silty sand. According to the classification silty sand can have up to 20% gravel fraction. This is important.
If we were talking about crossing the liquid limit, then increasing of water content in the sample may cause release of thicker grains, which consequently leads to increase in shear resistance and thus increase in the value of the internal friction angle.
Are you sure you mean crossing the plastic limit, maybe you mean reaching the liquid limit?
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