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首页> 外文期刊>Arabian journal of geosciences >Failure characteristics of brittle rock-like specimen with fractured internal structure under uniaxial compression
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Failure characteristics of brittle rock-like specimen with fractured internal structure under uniaxial compression

机译:单轴压缩下裂缝内部结构脆性岩样标本的失效特性

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摘要

The methods commonly used to prepare fractured structures can be used to form only 2D cracks or holes in rock specimen. In engineering, however, the geological structures considered usually have prominent 3D characteristics. To prepare specimens with 3D internal structures, a method to form real cavity in a hard-brittle rock-like model is proposed in this paper. The uniaxial compression test was then conducted on it using three cylinder samples (solid, internal fracture, and internal cavity), and main conclusions were obtained: (1) By using the volume loss method and super absorbent polymer as material in a small-scale laboratory test, rock-like samples with internal open-type flaws and cavities were prepared such that they were not in contact with the outer surfaces of the samples. (2) The results of the compression test show that the internal fractures reduced the uniaxial compressive strength as their volume increases. However, the size of the internal fracture had little influence on the elastic modulus and peak-time axial strain of the samples over a certain range. (3) Unlike the final failure surface obtained in 2D studies, the splitting surfaces shown in this test always extended diagonally with respect to the internal structures and were vertical to the preset fractures. (4) Because the horizontal section of the internal cavity/flaw was square in shape (the diagonals were perpendicular to each other), the direction of extension of the tensile failure surface was not along the horizontal diagonals of the internal structures but perpendicular to the corresponding diagonals.
机译:通常用于制备裂缝结构的方法可用于仅在岩石标本中形成2D裂缝或孔。然而,在工程中,考虑的地质结构通常具有突出的3D特征。为了制备具有3D内部结构的标本,本文提出了一种在硬脆性岩石状模型中形成真实腔的方法。然后使用三缸样品(固体,内部骨折和内腔)对单轴压缩试验进行,并获得了主要结论:(1)通过使用体积损失方法和超级吸收性聚合物作为小规模的材料制备实验室测试,制备具有内部开放式缺陷和空腔的岩状样品,使得它们与样品的外表面不接触。 (2)压缩试验的结果表明,由于其体积增加,内部骨折降低了单轴抗压强度。然而,内部骨折的尺寸对样品在一定范围内的弹性模量和峰时轴向应变几乎没有影响。 (3)与在第2D研究中获得的最终失败表面不同,该测试中所示的分裂表面总是相对于内部结构对角线延伸,并垂直于预设裂缝。 (4)因为内腔/缺陷的水平部分以方形为方形(对角线彼此垂直),所以拉伸失效表面的延伸方向不沿内部结构的水平对角线,但垂直于相应的对角线。

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