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Investigating the effect of unloading on artificial sandstone behaviour using the Discrete Element Method

Huang, Y; Cheng, YP; Coop, M; (2017) Investigating the effect of unloading on artificial sandstone behaviour using the Discrete Element Method. In: EPJ Web of Conferences. (pp. p. 15030). EDP Sciences Green open access

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Abstract

The Discrete Element Method (DEM) was used to simulate the mechanical behaviour of a reservoir sandstone. Triaxial tests were carried out using 3D-DEM to simulate the stress-strain behaviour of a sandstone with comparisons made between the numerical tests and the laboratory tests. The influence of isotropic unloading was investigated, which was found to have impacts on bond breakages and was successfully captured in the 3D shearing processes. It was found that bond breakages correlated strongly with the stress-strain behaviour of the sandstone affecting the peak strength. It was also found that unloading affected the bond breakages, which then changed the mechanical behaviour of sandstone. The tangent stiffnesses of simulated virgin and cored samples under different confining stresses were compared. From the tangent stiffnesses, gross yield envelopes and the yielding surfaces for unloaded samples and virgin samples were plotted and analysed in detail.

Type: Proceedings paper
Title: Investigating the effect of unloading on artificial sandstone behaviour using the Discrete Element Method
Event: Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/epjconf/201714015030
Publisher version: http://dx.doi.org/10.1051/epjconf/201714015030
Language: English
Additional information: This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10040477
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