| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 100 === The excavation or fill operations in geotechnical engineering usually considers soil stability which assisted with the soil constitutive law and numerical analysis software to increase the accuracy of engineering design. Based on the theory of microplane (Bazant et al.,2000), Chang and Sture (2006) had developed a constitutive model about soil deformation by shearing to generate anisotropy and the behavior of rotation of stress axis. According to the constitutive model, our study simplified 12 parameters of the constitutive model into 9 parameters to simulate soil behaviors of stress and strain by traditional triaxial tests with finite element method. Applying user-defined soil model built-in PLAXIS, we constructed the constitutive model to simulate triaxial CD test with Sacramento sand (Lee and Seed,1967). The simulated results were verified with the experiment ones. We successfully constructed the constitutive model for triaxial test modeling in PLAXIS. However, the parameters of triaxial CU test which we simulated still have to be adjusted further.
Finally, the initial effective stress and volume strain were obtained from the isotropic compressive test through the Soft Soil model built-in PLAXIS. After that, k parameter was simplified in the model to provide the orientation of the study in the future.
Keywords：Constitutive Model , Microplane, Plaxis, triaxial test
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