EFFECT OF FIELD MOISTURE CONTENT ON PENETRATION INDEX VALUE OF DYNAMIC CONE PENETROMETER IN ALLUVIAL SOIL SUBGRADES

Dynamic Cone Penetrometer is an ideal instrument for testing subgrade and embankment compaction and it in-situ California Bearing Ratio (CBR). The Dynamic Cone Penetration Index (DCPI) value has valid correlation with CBR. The relation has higher value of coefficient of determination, denoted as R², for non-cohesive soils dry soils. The fine grained alluvial soils having some Plasticity Index (PI) value shows the lower R² value. The Various alluvial soil samples having PI value from 0 to 10 were tested for finding the moisture correction factor so that DCPI values can be correlated with In-situ CBR at different field moisture conditions.