University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Doctoral Thesis:
Shun Wang
(2017):
Numerical simulation of soil creep with hypoplasticity.
Doctoral Thesis - Institut für Geotechnik (IGT),
BOKU-Universität für Bodenkultur,
pp 182.
UB BOKU
obvsg
FullText
- Abstract:
- We present a new constitutive model for the plastic and viscous behaviour of soil. This constitutive model consists of two parts, representing the frictional and viscous stresses in soil. The frictional part is based on a hypoplastic constitutive model and the viscous part is a rheological model, which contains a high order term, representing the strain acceleration. The performance of the proposed model is studied by simulating different elementary tests. The constitutive model is implemented in a finite element code. The numerical integration of constitutive model is studied by considering different integration methods, including explicit and implicit methods, as well as methods with return mapping to enhance these methods. The performance of these integration methods indicates that the adaptive explicit methods with stress correction provides the best results for the hypoplastic model. Therefore, this method is adopted to implement the time-dependent constitutive model, with the implementation then validated by modelling a number of simple boundary value problems. Finally, an in-situ direct shear creep test on a coarse-graded soil in a slope near the Three Gorges Dam is carried out and the test is simulated with our numerical model. A comparison of the experimental and FEM results reveals that the proposed model captures the salient creep behaviour of soils.
- Betreuer: Wu Wei