On two predictive models for the vertical swell percentage of expansive clays

Abstract

The general swelling model (termed the W-Model) based on local Israeli research has recently been updated by applying the Excel-solver command (ESC) analysis to new local test results obtained from 897 undisturbed specimens. In this analysis, the goodness-of-fit statistics classify the category of their associated regression only as fair. Thus, it seems necessary to explore the possibility of enhancing the outputs of this regression analysis by following the formulation of another existing model, in the present case that of the U.S. Corps of Engineers (termed the CE-Model), by again applying the ESC analysis to these new local test results. The statistical fit of the new CE-Models is shown to be slightly superior to the W-Models. However, in terms of practical implementation, no preference can be assigned to one of these two models although a preference model is suggested. This study concludes with the analysis of issues concerning equilibrium suction variations with depth, and their dependence on pavement-sealing capacities.

Keywords::

• vertical swelling percentage
• swelling pressure
• heave
• expansive clay
• swelling model

Acknowledgements

This study is based on engineering studies conducted for various Israeli governmental departments and authorities, and thanks are therefore due them.