Using the Modified State Surface Approach to Explain and Simplify the CASM
Publication: Geo-Congress 2022
ABSTRACT
The unified state parameter model for clay and sand (CASM), proposed in 1998, showed powerful capabilities in representing the behavior of both clayey and sandy soils. However, calibrating some of the model parameters is still an issue for practitioner engineers. Recently, the modified state surface approach (MSSA) was proposed to represent the unsaturated soil’s behavior. This approach was successfully used to represent many unsaturated soils’ behavioral features. In this paper, the MSSA is used to mathematically derive surface equations for the CASM. The derived surfaces can be used to easily calibrate the model parameters and to represent the soil behavior under isotropic and general stress conditions. To validate the model surfaces, first, they were used to predict the behavior of several soils and compare them with the available results from the literature for the same model. Then, a parameter calibration algorithm is proposed, and step-by-step procedures are illustrated. Generally, using the MSSA made it simple and straightforward to calibrate the CASM model parameters.
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Geo-Congress 2022
Pages: 658 - 668
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Published online: Mar 17, 2022
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