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The main purpose of this study was to investigate the relationship between the undrained shear strength and the Atterberg limits of quartz clay mixtures using the falling cone test and the casagrande method. As a result, the penetration depth of the fall cone, which determines the liquid limit close to the value obtained by the casagrande method, was changed by the presence or absence of fine grained soils. It was shown that the same clay type with a much higher quartz content led to smaller undrained shear strength values. The undrained shear strength value with a small amount of quartz was the lowest; it then increased with the increase in fine content. The relationship between the undrained shear strength and the Atterberg limits for all the samples can be divided into three parts: (1) quartz clay (kaolinite/bentonite) mixtures ratio, (2) type of clay (plasticity; high - low plasticity), and (3) plastic limit value. Finally, an equation for the fall cone test used to determine the Atterberg limit of quartz clay mixtures, was proposed based on the undrained shear strength and initial water content.

Relationship Between Undrained Shear Strength with Atterberg Limits of Kaolinite/Bentonite – Quartz Mixtures