engleski

Triaxial test simulation on Erksak sand using hardening soil model

Hardening Soil model (HS) available in numerical computer program Plaxis is widely used in geotechnical practice for modeling both cohesive and noncohesive soils. The basic characteristics of the model are stress dependent stiffness according to a power law, plastic straining due to primary deviatoric loading, plastic straining due to primary compression, elastic unloading/reloading and failure according to the Mohr-Columb model. In this paper parameters of HS model are evaluated for Erksak sand. The triaxial tests database used consists of 15 drained and 31 undrained tests and it covers wide range of sand density and isotropic consolidation pressure. Results of simulations show that relative density has to be accounted for to be able to simulate the sand behavior for different states. Some relationships to relative density are proposed for reference secant stiffness, effective angle of internal friction and angle of dilatancy. Great advantages of HS model, but also some limitations are presented in this paper, both for drained and undrained conditions.

sand modeling; hardening soil model; triaxial test; critical state; dilatancy; Plaxis software

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