Suitability of empirical equations for estimating permanent settlement of railway foundation materials subjected to cyclic loading with principal stress rotation
- 1 October 2021
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Geotechnical Journal
- Vol. 58 (10), 1603-1610
- https://doi.org/10.1139/cgj-2020-0183
Abstract
This paper uses the results of a series of laboratory tests with cyclic principal stress rotation to assess the suitability of a number of empirical equations for estimating the development of plastic settlements in railway track foundations. The laboratory tests were carried out on three sand-clay mixes representative of railway track foundation materials, in both free-to-drain and undrained conditions. The results of a non-linear regression analysis demonstrate that the drainage conditions are the key factor affecting the estimation accuracy of the models, with the clay content playing a secondary role. The correlation coefficient was generally higher in free-to-drain than in undrained conditions, and reduced slightly with increasing clay content.Keywords
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