Abstract Grouting reinforcement is a common way to strengthen fractured rock mass in rock engineering, which will transform the natural open flaws in rock mass into filled flaws. The existence of fillers will change the stress state of the flaws, thus affecting the mechanical properties and cracking behavior of fractured rock mass. In this paper, uniaxial compression experiments were carried out on granite specimens in four different filling states to study the effects of different filling materials on the strength, fracture behavior and strain state of flawed rock specimen. The experimental results show that compared with the unfilled specimen, the fillers can improve the strength of the specimen, delay the crack initiation and reduce the strain at the flaw tip, but these effects will weaken with the increase of the flaw inclination angle. In addition, the effect of fillers varies with different filling materials, and the effect of resin and gypsum fillers is significantly greater than that of silicone filler. Moreover, the mechanism of the interaction between filler and rock specimen is analyzed. The results reveal that the fillers can reduce the flaw tip stress, which is related to filling material parameters. This reduction of flaw tip stress will be more significant with the increase of the elastic modulus of the filling material, the friction angle and cohesion of the interface between rock and filling material.

中文翻译：

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裂隙充填片麻岩单轴压缩力学行为及破坏分析

摘要 注浆加固是岩石工程中对裂隙岩体进行加固的常用方法，将岩体中天然的开放缺陷转化为填充缺陷。填料的存在会改变裂缝的应力状态，从而影响裂隙岩体的力学性能和开裂行为。本文对四种不同充填状态下的花岗岩试件进行单轴压缩试验，研究不同充填材料对有裂隙岩石试件强度、断裂行为和应变状态的影响。实验结果表明，与未填充试样相比，填料能提高试样强度、延缓裂纹萌生、降低裂纹尖端应变，但这些作用随着裂纹倾角的增大而减弱。另外，填料的作用因填料的不同而不同，树脂和石膏填料的作用明显大于有机硅填料。此外，分析了填料与岩石试件相互作用的机理。结果表明，填料可以降低缺陷尖端应力，该应力与填充材料参数有关。随着充填材料弹性模量、岩石与充填材料界面的摩擦角和内聚力的增加，裂纹尖端应力的减小将更加显着。结果表明，填料可以降低缺陷尖端应力，该应力与填充材料参数有关。随着充填材料弹性模量、岩石与充填材料界面的摩擦角和内聚力的增加，裂纹尖端应力的减小将更加显着。结果表明，填料可以降低缺陷尖端应力，该应力与填充材料参数有关。随着充填材料弹性模量、岩石与充填材料界面的摩擦角和内聚力的增加，裂纹尖端应力的减小将更加显着。