Uniaxial Compression of Synthetic, Poorly Consolidated Granular Rock with a Bimodal Grain-size Distribution |
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| Authors: | F Saidi Y Bernabé T Reuschlé |
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| Institution: | (1) CNRS-Université Louis Pasteur, Institut de Physique du Globe de Strasbourg, Strasbourg, France |
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| Abstract: | Summary. We attempted to gain some insight into the mechanical properties of poorly consolidated granular rock by preparing and testing synthetic rock specimens in which different cement content and bimodal grain-size distributions were used. We mixed various proportions of fine and coarse sand, Portland cement, and water. The mixture was cast in a mold and left pressure-free during curing, thus ensuring that the final material was poorly consolidated. The specimens were tested in a uniaxial press. During these tests, the static Young s modulus was measured by performing small stress excursions at discrete intervals along the stress-strain curve. We observed significant non-linear elasticity (i.e., Youngs modulus increased with stress) in all the specimens. As expected, the uniaxial compressive strength increased with increasing cement content. Furthermore, we observed a transition from grain-size sensitivity of strength at cement contents less than 20–30% to grain-size independence above this value. At high cement content, the measured values of Youngs modulus are relatively well explained by a model based on rigid inclusions embedded in a soft matrix. At low cement content, we suggest that modelling the individual cemented grain-to-grain contacts becomes necessary. But this could not be done here for lack of microstructural information. |
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| Keywords: | : Strength elastic properties granular rocks cementation grain size |
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