ESTIMATION OF A CORRELATION EQUATION BETWEEN CBR AND DCP FOR SILTY SOILS FROM THE MH GROUP IN SINCELEJO CITY, COLOMBIA

This research aims at estimating a correlation equation between California Bearing Ratio (CBR) and Dynamic Cone Penetrometer (DCP) for the specific case of subgrade fine grained soils, classified in the Unified Soil Classification System as high compressibility silt (MH), for Sincelejo city in Colombia; so that support capacity of these subgrade soil types could be quickly and economically estimated. Twelve sites located in the city's southern part were selected, where in-situ tests (DCP) and unaltered samples were taken for laboratory CBR estimation. After obtaining the dispersion plots and corresponding correlation curves, 80%, 85% and 85% estimation coefficients resulted for the correlation equations found from the penetration rates and CBR values at 0.1", 0.2" and minimum CBR, respectively. Therefore, the equations found have a good data representation of the tests carried out.