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首页> 外文期刊>Rock Mechanics and Rock Engineering >Uniaxial Compression of Synthetic, Poorly Consolidated Granular Rock with a Bimodal Grain-size Distribution
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Uniaxial Compression of Synthetic, Poorly Consolidated Granular Rock with a Bimodal Grain-size Distribution

机译：具有双峰粒度分布的合成固结较弱的颗粒岩的单轴压缩

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摘要

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 nonlinear elasticity (i.e., Young's 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 Young's 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.
机译：我们试图通过制备和测试使用不同水泥含量和双峰粒度分布的合成岩石标本，来深入了解弱固结粒状岩石的力学性能。我们混合了各种比例的细砂和粗砂，波特兰水泥和水。将混合物浇铸在模具中，并在固化过程中保持无压力，从而确保最终材料的固化不良。在单轴压力机中测试样品。在这些测试中，通过沿应力-应变曲线以不连续的间隔执行小的应力偏移来测量静态杨氏模量。我们在所有样品中观察到了明显的非线性弹性（即杨氏模量随应力增加）。如预期的那样，单轴抗压强度随水泥含量的增加而增加。此外，我们观察到从水泥含量低于20-30％时强度的粒度敏感性转变为高于该值的粒度独立性。在高水泥含量下，杨氏模量的测量值可以通过基于嵌入软基质中的刚性夹杂物的模型来很好地解释。在低水泥含量的情况下，我们建议对单个水泥固结的晶粒间接触进行建模是必要的。但是由于缺乏微结构信息，因此无法在此处完成。

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