Inverse analysis on compressibility of toronto clays

This study investigated the compressibility of clay deposits in Toronto, Canada, through an inverse analysis. A series of oedometer test results from a local transit project were collected and used to calibrate the stiffness parameters according to the Hardening Soil (HS) model. The inverse analysis was conducted by coupling UCODE, a universal inverse modeling tool, and PLAXIS to fit the simulated stress-strain curves to the test results. First, a sensitivity analysis was performed to identify the most critical model parameters and sim-plify the problem by removing less sensitive parameters. Second, the selected HS model parameters were calibrated for a total of 71 oedometer tests conducted on different soil types. Third, a statistical analysis was performed on the calibrated HS model parameters according to soil type. In the end, a series of prediction formulas were derived to estimate the compressibility parameters from soil index properties and standard penetration test measurements, which can be used to better simulate the deformation behavior of local soils in practice. (c) 2023 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society. This is an open access article under the CC BY -NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

This study investigated the compressibility of clay deposits in Toronto, Canada, using an inverse analysis method. By calibrating the stiffness parameters of the Hardening Soil model with oedometer test results, the simulated stress-strain curves were fitted to the actual data. Sensitivity analysis and statistical analysis were performed to simplify the problem and derive prediction formulas for estimating compressibility parameters based on soil index properties and standard penetration tests.