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01-07-2015 | Original Paper | Issue 4/2015

Rock Mechanics and Rock Engineering 4/2015

Laboratory Observation and Micromechanics-Based Modelling of Sandstone on Different Scales

Journal:
Rock Mechanics and Rock Engineering > Issue 4/2015
Authors:
Liming Li, Idar Larsen, Rune M. Holt

Abstract

The mechanical properties of sandstone are, to a large extent, controlled by its microstructure. When sandstone is loaded, the stress conditions and stress history can influence the sandstone in terms of the deformation parameters, strength parameters, failure modes, as well as acoustic properties and other petrophysical parameters. In this paper, we show how we may use a discrete element model to compute the mechanical behaviour based on the microstructure of the rock, as obtained from micro-computed tomography. The model is calibrated with triaxial test data obtained with three different sandstones. The key element in the model is a contact law, attempting to capture deformation and failure at the level of the grain scale. A micromechanics-based core-scale model was also suggested using the same contact law but without explicitly mimicking the rock microstructure. The simulation results from both the microscale model and the macroscale model were in reasonably good agreement with the laboratory measurements on sandstone specimens.

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