Seminar - De-an Sun - Three-dimensional elastoplastic model for clay
Wednesday, March 17, 2004, 1.10 - 1.50 pm
Civil Engineering Lecture Room 3
Two parts about constitutive modelling of soils will be presented. One is to introduce a method to generalize the elastoplastic models for geomaterials. As well known, most of the models such as Cam-clay model hold good only in triaxial compression stress, and how to generalize the models to three-dimensional stress is open. A common method is so-called g(sita)-method proposed by Zienkiewicz and Pande (1977), but this method does not take the stress-induced anisotropy of soils into consideration. A simple method will be introduced, which is called transformed stress method. Another topic is triaxial test on unsaturated soils and elastoplastic model for unsaturated soils. Triaxial testing apparatus for unsaturated soils developed in Nagoya Institute of Technology and the test results will be introduced, especially collapse behavior of unsaturated soils. A three-dimensional elastoplastic model for compacted unsaturated soils will be presented, compared with unsaturated soil behavior.