A constitutive model for hyromechanically coupled behavior of unsaturated soils with hydraulic hysteresis

Creative Commons License

Eyüpgiller M. M., Kenanoğlu M. B., Ülker M. B. C., Toker N. K.

3rd PanAmerican Conference on Unsaturated Soils, Rio De Janeiro, Brezilya, 25 - 28 Temmuz 2021, ss.1-7

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Doi Numarası: 10.1051/matecconf/202133702009
  • Basıldığı Şehir: Rio De Janeiro
  • Basıldığı Ülke: Brezilya
  • Sayfa Sayıları: ss.1-7
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

There are several constitutive models developed for understanding coupled hydromechanical
behavior of three phase medium of unsaturated soils as well as models for explaining hydraulic hysteresis in
water retention. However, very few attempts that merge the two aspects of behavior are available. This
study develops a one-way coupled model for understanding the hydromechanical behavior of unsaturated
soils. In addition to the hysteresis between main drying and wetting retention curves, the model considers
non-uniqueness of retention behavior resulting from void ratio changes due to compression under the stress
application. As for the elastoplastic stress strain relationship of soil skeleton, the model is based on the
formulation of classical plasticity relying on the critical state concept. Consequently, volumetric
deformation due to wetting-drying cycles and its effect on elastoplastic behavior through simultaneously
changing matric suction is modeled. Model results are calibrated with the results of isotropic compression
stages of triaxial tests at both constant suction and constant water content conditions.