Grouting is a common method used to fill rock joints to improve the stability and integrity of rock mass in geotechnical engineering, and the filling has been observed to have an effect on crack behavior and mechanical property. To investigate this topic, a numerical study of crack behavior and mechanical property of rock samples with two parallel open flaws or infilled flaws under uniaxial compression was conducted in this research. The smooth joint model was proved to be suitable to simulate the interface between rock material and grout material. The occurrence of shear cracks at the interface between rock material and grout material as well as the occurrence of tensile cracks in the grouting material has been successfully simulated in this research. Numerical results indicate that grouting can reduce the tensile force near the flaws, suppress the generation of tensile cracks, and improve the initiation stress of the sample. The tensile force in the specimens with infilled flaws is smaller than that with open flaws, which lead to the improvement of the peak strength of the sample. Moreover, crack development and mechanical properties of samples are affected by bridge inclination angle and flaw inclination angle.

中文翻译：

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单轴压缩下两个平行填充缺陷试样的断裂行为和强度的数值分析

灌浆是在岩土工程中用于填充岩缝以改善岩体的稳定性和完整性的一种常用方法，并且已观察到填充对裂缝行为和力学性能有影响。为了研究这个问题，对单轴压缩下具有两个平行开裂缺陷或填充缺陷的岩石样品的裂纹行为和力学性能进行了数值研究。事实证明，光滑节理模型适合于模拟岩石材料与灌浆材料之间的界面。该研究成功地模拟了岩石材料与灌浆材料之间的界面处的剪切裂纹的发生以及灌浆材料中的拉伸裂纹的发生。数值结果表明，注浆可以降低裂缝附近的拉力，抑制拉伸裂纹的产生，并提高样品的初始应力。具有填充缺陷的样品中的拉伸力小于具有开放缺陷的样品中的拉伸力，这导致了样品的峰值强度的提高。而且，样品的裂纹发展和机械性能受桥倾角和缺陷倾角的影响。