In this work, we suggest a modified phase-field model for simulating the evolution of mixed mode fractures and compressive driven fractures in porous artificial rocks and Neapolitan Fine Grained Tuff. The numerical model has been calibrated using experimental observations of rock samples with a single saw cut under uniaxial plane strain compression. For the purpose of validation, results from the numerical model are compared to Meuwissen samples with different angles of rock bridge inclination subjected to uni-axial compression. The simulated results are compared to experimental data, both qualitatively and quantitatively. It is shown that the proposed model is able to capture the emergence of shear cracks between the notches observed in the Neapolitan Fine Grained Tuff samples as well as the propagation pattern of cracks driven by compressive stresses observed in the artificial rock samples. Additionally, the typical types of complex crack patterns observed in experimental tests are successfully reproduced, as well as the critical loads.

中文翻译：

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多孔岩石裂纹成核与扩展的相场断裂模拟

在这项工作中，我们提出了一种改进的相场模型，用于模拟多孔人造岩石和那不勒斯细粒凝灰岩中混合模式裂缝和压缩驱动裂缝的演化。数值模型已经使用在单轴平面应变压缩下的单锯切岩石样品的实验观察进行了校准。为了验证的目的，将数值模型的结果与受到单轴压缩的不同角度的岩桥倾角的 Meuwissen 样本进行比较。将模拟结果与实验数据进行定性和定量比较。结果表明，所提出的模型能够捕捉在那不勒斯细粒凝灰岩样品中观察到的缺口之间出现的剪切裂缝，以及在人造岩石样品中观察到的压缩应力驱动的裂缝扩展模式。此外，在实验测试中观察到的典型类型的复杂裂纹模式被成功再现，以及临界载荷。