Avaliação da plasticidade de solos através da utilização do cone de penetração.

Abstract

This research presents a study to determine the Atterberg parameters for eleven samples of natural soils, from the State of Paraíba, using conventional procedures, as well as those using the device called fall cone test. Determinations of liquidity limit values through the penetration cone were performed according to 8S 1377 (1975), while the plasticity index values ​​were determined based on the resistance criterion obtained in two ways: - using the slope of the line in the h x log p plane. where h is the moisture content and p is the cone penetration; - using the equation proposed by Wood and Wroth, using a cone with a stem of different masses. Based on the results obtained, it was concluded that the procedures used were adequate to the types of soils tested, since the values ​​determined, both for liquidity limit and plasticity index, presented repeatability considered satisfactory, being these superior to the procedures that use the penetration cone, in relation to the conventional methods. Linear regression analyzes were used, and through these, significant simple linear correlations between the liquidity limit and plasticity index values ​​obtained by the different compared procedures were determined. Based on the statistical study, penetrations in the range of 14 mm to 16 mm are suggested as the most suitable for determining the LL of the studied samples, replacing the standard test penetration.