Abstract:
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The aim of this thesis is the application and validation of a Double Hardening
Soil Model(DHSM). In this model, two hardening mechanism are comprised
named volumetric hardening from a unified Critical state model for Clays and
sands (CASM) by Yu (1998) and shear hardening from Hardening soil model
(HSM). The basic equations and corresponding parameters are discussed. Some
improvements and modifications of DHSM are introduced and the constitutive
model is implemented in to Plaxis finite element code.
In addition, a serial of tests on low plasticity clay performed by Gens (1982)
have been carried out. Among them, drained tests including different
consolidation rate and isotropic-anisotropic condition on the low plasticity clay
are identified and applied by DHSM program. Variety of complex geomaterial
behaviors are examined and studied based on both laboratory and numerical
simulation results.
Through the results, the model corresponds well with the drained test through
real parameters especially during overconsolidated condition. The strain rate
can be significantly decreased during hardening process which is more closed
to the real behavior. Meanwhile, the enhanced model E-DHSM proved to be
powerful in the “dry side” state which agrees well with the deviatoric stress .
Finally, considering various consolidation condition, the framework of DHSM
agrees well in a wide range of soil tests and geomaterial behavior. It proved to be powerful for implementation and application in soil behavior. |