Rajitha Shehan Udukumburage *, Chaminda Gallage, Les Dawes
Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD, Australia
The moisture variations in expansive soils cause shrink-swell behavior, resulting in distress to the structures found in/on problematic soils.
The oedometer-based tests can be used to determine the swell behavior of soil; however, limited research has been conducted for vertical shrinkage estimations.
In this study, a series of conventional oedometer tests were conducted to investigate the vertical shrinkage of grey Vertosol due to soil moisture variations under different surcharges.
A statistically strong relationship (R^2 = 0.99) was observed for shrinkage per unit change in volumetric water content under shallow overburden pressures (surcharges).
The validation of the shrinkage was conducted by simulating field conditions under an induced drying cycle.
The derived shrinkage prediction equation and Aitchison’s method showed underestimations of 10.1% and 44.0% of the actual shrinkage respectively.
Briaud’s and Dhowian’s models overestimated the value by 59.0% and 44.5% respectively.
This study emphasizes the applicability of the conventional oedometer-based shrinkage test for a reasonable estimation of vertical shrinkage for a given expansive soil.
Thereby, proposing a simple and practical approach to obtain shrinkage characteristics for geotechnical engineering applications.
Natural hazards, Environmental science, Geochemistry, Structural engineering, Instrumented soil column, Vertical shrinkage, Oedometer test, Geo-environmental engineering, Expansive soils