The mechanical properties of fractured rock mass have an important influence on the safety and stability of underground engineering. Grouting is a common way to reinforce fractured rock mass. The uniaxial compression tests of red sandstone specimens with different prefabricated crack inclination angles before and after grouting were carried out. Based on the load-deformation data and synchronous image acquisition, the mechanical properties, crack propagation law and failure mode of the specimens before and after grouting were studied. The results show that the peak strength and elastic modulus of the ungrouted specimen increase with the increase of the inclination angle of the prefabricated crack. Compared with the ungrouted specimen, grouting can significantly improve the peak strength and elastic modulus of the specimen. The cracks of the ungrouted specimen mainly initiate from the tip of the prefabricated crack, and the cracks of the grouting specimen mainly initiate from the upper and lower surfaces of the specimen and the far field. Based on the macroscopic and microscopic damage theory, the constitutive model of grouting rock mass is proposed. By comparing with the experimental data, the rationality of the constitutive model is verified.

中文翻译：

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裂隙岩体注浆加固效果的试验与理论模型研究


裂隙岩体的力学性能对地下工程的安全稳定具有重要影响。灌浆是加固裂隙岩体的常用方法。对不同预制裂缝倾角的红砂岩试件进行注浆前后的单轴压缩试验。基于载荷-变形数据和同步图像采集，研究了注浆前后试件的力学性能、裂纹扩展规律和破坏模式。结果表明：未灌浆试件的峰值强度和弹性模量随着预制裂缝倾角的增大而增大;与未灌浆试件相比，灌浆可显著提高试件的峰值强度和弹性模量。未灌浆试件的裂纹主要从预制裂纹的尖端开始，注浆试件的裂纹主要从试件的上下表面和远场开始。基于宏观和微观损伤理论，提出了注浆岩体本构模型。通过与实验数据进行对比，验证了本构模型的合理性。