Answer Posted / ihab said

U can increase it by good compaction, the problem shows up
when excess water added to the soil, coz over saturated soil
loses weight and some of its key ingredients, specially
Silica. So, u should add the OWC = optimum water content;
which u get it from Proctor test. However; adding cementious
materials improves the Strength of he soil. but usually in
Pavement Construction, Compaction is no# 1 solution, but if
fails then replacing the existing soil with Rock Fill will
be the solution. By the way, u can use pile foundation in
such cases.

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