Applications of artificial intelligence in constitutive modelling of soils.

An appropriate constitutive model embedded in a finite element engine is the key to the successful prediction of the observed behaviour of geotechnical structures. However, to capture the behaviour of geomaterials accurately, the constitutive models have to be complex involving a large number of material parameters and constants. This thesis resents a methodology for converting or recasting complex constitutive models for eomaterials developed based on any constitutive theory into a fully trained Artificial neural Network (ANN), which is then embedded in an appropriate solution code. The sength of strain trajectory traced by a material point, also called 'intrinsic time' is used as 1 additional input parameter in training. For the purpose of illustration, two constitutive models viz. Hardening Soil Model available in the commercial software, PLAXIS and a wo-surface deviatoric hardening model in the multilaminate framework developed by ee and Pande (2004) have been cast in the form of an ANN