A new double structure model for expansive clays

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Title: A new double structure model for expansive clays
Author(s): Ghiadistri, GM
Potts, DM
Zdravkovic, L
Tsiampousi, A
Item Type: Conference Paper
Abstract: The behaviour of compacted bentonite upon hydration is n umerically investigated here by simu- lating a swelling pressure test on a MX - 80 bentonite sample . Two constitutive models are employed in the analysis : the “Imperial College Single - Structure Model” (ICSSM) and the “Imperial College Double - Structure Model” ( ICDSM), the latter specifically developed for expansive clays. It is shown that the latter exhibits a considerably improved performance as it is able to accurately capture the swelling pressure developed in the material upon wetting . Nevertheless, a limite d knowledge of the evolution of the material’s fabric, notably at the micro - scale, is an obstacle for deriving with certainty some of the model parameters . This issue is high- lighted here by performing analyses of the swelling pressure test with two sets of material characterisations, with model parameters differ ing i n the derivation of the microstructural component . B oth analyses show a very good match with the test data , but it is difficult to justify one set of microstructural parameters over the other. T he paper emphasises what aspects of experimental research could be helpful in studying the fabric of compacted bentonite upon wetting, and hence improve the calibration procedure of the double - structure mod- el.
Publication Date: 3-Aug-2018
Date of Acceptance: 22-Jan-2018
URI: http://hdl.handle.net/10044/1/62201
Copyright Statement: © 2018 The Author(s)
Sponsor/Funder: RWM Ltd & AMEC-Foster-Wheeler
Conference Name: 7th International Conference on Unsaturated Soils
Publication Status: Published
Start Date: 2018-08-03
Finish Date: 2018-08-05
Conference Place: Hong Kong, China
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering
Geotechnics



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