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INFLUENCE OF PLASTICITY INDEX ON STRENGTH PARAMETERS IN COHESIVE SOILS
Abstract
Angle of friction ?, cohesion c and undrained shear strength ?fu are the strength parameters that characterize the mechanical properties of soils. These parameters determine the bearing capacity of a cohesive subsoil. The value of strength parameters depends on many factors, e.g. soil type, consistency, stress state, stress history, loading type and loading mode. The paper presents the influence of plasticity index Ip on strength parameters in cohesive soils. To determine the dependence of strength parameters on the plasticity index a lot of tests in a triaxial apparatus on overconsolidated cohesive soils characterized by a plasticity index Ip in the range from 10% to 79% were carried out. Triaxial tests were performed in isotropic consolidation and shearing of soil samples in drained and undrained conditions. Based on the test results the analysis of the relationship between strength parameters (the angle of internal friction, cohesion, normalized undrained shear strength) and plasticity index were presented in respect to the used standards and literature.
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