E3S Web Conf.
Volume 92, 20197th International Symposium on Deformation Characteristics of Geomaterials (IS-Glasgow 2019)
|Number of page(s)||6|
|Section||Laboratory Experimental Techniques: Element Scale|
|Published online||25 June 2019|
Characterization of transverse anisotropy in Poisson's ratio using three-point radial deformation measurements
Middle East Technical University, Department of Civil Engineering, 06800 Ankara, Turkey
2 Yapı Merkezi, 34676 Istanbul, Turkey
* Corresponding author: firstname.lastname@example.org
Poisson's ratio (v) of rock specimens can be experimentally determined from radial deformation measurements in an unconfined compression test. This is commonly achieved by mounting a compressometer with diametric or perimetric measurement capability, both of which assume the specimen cross-section remains a circle. If there is anisotropy among the horizontal directions, this assumption fails and measurements err. In this study, a compressometer with three radial deformation measurements is developed. The accuracy of new compressometer in determining the mean of the two v values along the two axes of anisotropy is theoretically investigated, assuming the deformed specimen is an ellipse in cross-section. Then, to capture separate v values along the axes of anisotropy, data from actual tests employing the new device were analysed in two different approaches: Assuming the centroid of the cross-section remains stationary (1) does not produce physically reasonable results. Assuming the specimen moves laterally and v values are constant (2) is possible through a grid search-type optimization algorithm. This results in calculation of the orientation of axes of anisotropy with respect to the compressometer, as well as the corresponding v value.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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