Abstract Veined rock masses can be found in porphyry copper deposits like at the El Teniente mine in Chile. Rock masses with cemented joints or veins cannot be accurately represented using the methods commonly applied to predict the deformability and strength of jointed rock masses. Laboratory tests on veined rock andesite from the El Teniente mine have shown that the veins control the fracturing process and strength. In this work, the behavior of veined rock was studied using a numerical model, built in the finite element software ABAQUS. In this analysis, the rock mass was modeled as an assemblage of blocks bonded by layers, representing the intact rock and veins respectively. Uniaxial compression tests on veined core-size specimens were simulated and their results compared to experimental data. The results show good agreement with the experiments in terms of strength, stiffness and mode of failure. After this, a veined rock mass volume was modeled using the orientation of mapped and post-processed discontinuities as input. Simulations of uniaxial and triaxial tests were performed on the modeled veined rock mass. The observed failure mode confirms experimental results, showing that at low confinement the failure is concentrated in the veins and the rupture of intact rock becomes significant at higher confinement. The obtained strength envelope of the veined rock mass is non-linear and its shape is independent of the strength of the intact rock; however, the Hoek-Brown criterion did not fit the results. The residual strength of the veined rock approximated the residual strength of the intact rock, agreeing with previously reported observations in jointed rock.

中文翻译：

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脉状岩体强度及变形性数值研究

摘要 脉状岩体可以在像智利 El Teniente 矿那样的斑岩铜矿床中找到。使用通常用于预测节理岩体变形能力和强度的方法无法准确表示具有胶结节理或脉的岩体。对 El Teniente 矿脉岩安山岩的实验室测试表明，脉管控制着压裂过程和强度。在这项工作中，使用有限元软件 ABAQUS 中建立的数值模型研究脉岩的行为。在此分析中，岩体被建模为由层粘合的块体组合，分别代表完整的岩石和脉。模拟了脉纹岩心尺寸试样的单轴压缩试验，并将其结果与实验数据进行了比较。结果表明，在强度、刚度和失效模式方面与实验非常吻合。在此之后，使用映射和后处理不连续性的方向作为输入对脉状岩体体积进行建模。在模拟脉状岩体上进行了单轴和三轴试验的模拟。观察到的破坏模式证实了实验结果，表明在低限制条件下，破坏集中在脉中，而在高限制条件下，完整岩石的破裂变得显着。获得的脉状岩体强度包络线是非线性的，其形状与完整岩石的强度无关；然而，Hoek-Brown 标准不符合结果。脉状岩石的残余强度近似于完整岩石的残余强度，