Towards the development of a new isotach elastoplastic constitutive model for soft soils
Towards the development of a new isotach elastoplastic constitutive model for soft soils
This paper presents some features of a new isotach elastoplastic constitutive model for soft soils, named as the Modified Hunter Clay (MHC) model, developed from the isotach elastoplastic model of Yang et al. (2016), named as the Original Hunter Clay (OHC) model. Both models are capable of reproducing the three key behaviours of destructuration, anisotropy and rate dependency which feature in the mechanical response of soft soils. A key development in the MHC model is the replacement of creep strain rate with viscoplastic strain rate, which results in a simplified understanding and modelling of the time dependent behaviour of soft soils. Additionally, to overcome the difficulty in dealing with different time scales in the OHC model, the MHC model considers creep as a strain rate phenomenon and incorporates a new relationship to describe the evolution of viscoplastic strain rate with time, based on the time resistance concept. This modification eliminates the need to use absolute time, which refers to the geological history of the soil. A single element simulation of the model has been carried out, and promising results are obtained in predicting the 1D compression behaviour of Batiscan clay (Leroueil et al., 1985).
Weidong Wang; Alexander Lester; George Kouretzis; Jubert Pineda; John Carter
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
1. Constitutive modelling for saturated and unsaturated soils
https://doi.org/10.53243/NUMGE2023-39
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