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首页> 外文期刊>Engineering Fracture Mechanics >Fracture analysis of sandstone with a single filled flaw under uniaxial compression
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Fracture analysis of sandstone with a single filled flaw under uniaxial compression

机译：单轴压缩下单次填充缺陷的砂岩断裂分析

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Natural rock joints with infilling materials such as clay, broken rock fragments, or even cement mortar infusion material are common in the field of rock engineering. The fracture behavior of a rock with a filled flaw is related to both the flaw inclination and mechanical properties of the infilling materials. In this study, uniaxial compression experiments were performed for sandstone specimens with different flaw inclinations varying from 0 degrees to 90 degrees, and four kinds of infilling conditions, including no filler, gypsum filler, cement filler, and resin filler were considered. The damage process of specimens was revealed and traced by acoustic emission (AE) and digital image correlation (DIC) to comprehensively understand the cracking evolution. Macroscopic cracking information was recorded with a high-resolution camera, and crack patterns were identified and classified. The influence of infilling material and flaw inclination on the sandstone cracking process was studied. The tensile stress was found to be suppressed due to the existence of infilling materials, and different infilling materials have different effects on the crack initiation stress. As a result, specimens with a filled flaw have larger crack initiation stress levels and smaller crack inclination angles than specimens with an unfilled flaw. The effects of infilling materials and flaw inclination angles on crack initiation are analyzed with a theoretical model based on the Coulomb friction law. The compressibility effect of infilling materials on the cracking behavior is also investigated through displacement and strain fields.
机译：天然岩石接头与infilling材料如粘土，破碎的岩石碎片，甚至水泥砂浆输注材料在岩石工程领域很常见。填充缺陷的岩石的断裂行为与缺陷材料的缺陷倾斜和机械性能有关。在该研究中，对砂岩试样进行单轴压缩实验，不同缺陷倾斜度从0度变化到90度，并且考虑了四种infilling条件，包括无填料，石膏填料，水泥填料和树脂填料。通过声发射（AE）和数字图像相关（DIC）揭示并追踪标本的损伤过程，以全面地理解开裂的进化。用高分辨率相机记录宏观裂缝信息，并确定并分类裂纹模式。研究了infilling材料和缺陷对砂岩开裂过程的影响。由于存在infilling材料而发现拉伸应力被抑制，并且不同的infilling材料对裂纹引发应力产生不同的影响。结果，具有填充缺陷的标本具有较大的裂纹启动应力水平和比具有未填充缺陷的标本更大的裂缝倾斜角度。基于库仑摩擦法的理论模型，分析了infilling材料和缺陷倾斜角度对裂纹开始的影响。还通过位移和应变场研究了infilling材料对裂解行为的可压缩效应。

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