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Uniaxial compression of synthetic, poorly consolidated granular rock with a bimodal grain-size distribution
The mechanical properties of poorly consolidated granular rock were investigated by preparing and testing synthetic rock specimens in which different cement content and bimodal grain-size distributions were used. Various proportions of fine and coarse sand, Portland cement, and water were mixed. 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. A significant non-linear elasticity, i.e., Young's modulus increased with stress, in all the specimens was observed. As expected, the uniaxial compressive strength increased with increasing cement content. Furthermore, a transition from grain-size sensitivity of strength at cement contents less than 20 - 30 % to grain-size independence above this value was observed. At high cement content, the measured values of Young's modulus were relatively well explained by a model based on rigid inclusions embedded in a soft matrix. At low cement content, it is suggested that modelling the individual cemented grain-to-grain contacts becomes necessary. But this could not be done for lack of microstructural information.
Uniaxial compression of synthetic, poorly consolidated granular rock with a bimodal grain-size distribution
The mechanical properties of poorly consolidated granular rock were investigated by preparing and testing synthetic rock specimens in which different cement content and bimodal grain-size distributions were used. Various proportions of fine and coarse sand, Portland cement, and water were mixed. 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. A significant non-linear elasticity, i.e., Young's modulus increased with stress, in all the specimens was observed. As expected, the uniaxial compressive strength increased with increasing cement content. Furthermore, a transition from grain-size sensitivity of strength at cement contents less than 20 - 30 % to grain-size independence above this value was observed. At high cement content, the measured values of Young's modulus were relatively well explained by a model based on rigid inclusions embedded in a soft matrix. At low cement content, it is suggested that modelling the individual cemented grain-to-grain contacts becomes necessary. But this could not be done for lack of microstructural information.
Uniaxial compression of synthetic, poorly consolidated granular rock with a bimodal grain-size distribution
Uniaxiale Kompression von synthetischem, schwach konsolidiertem Gestein mit einer bimodalen Korngrößenverteilung
Saidi, F. (Autor:in) / Bernabe, Y. (Autor:in) / Reuschle, T. (Autor:in)
Rock Mechanics and Rock Engineering ; 38 ; 129-144
2005
16 Seiten, 9 Bilder, 2 Tabellen, 31 Quellen
Aufsatz (Zeitschrift)
Englisch
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