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Experiment and peridynamic simulation on cracking behavior of red sandstone containing a single non-straight fissure under uniaxial compression
Theoretical and Applied Fracture Mechanics ( IF 5.3 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.tafmec.2020.102637 Sheng-Qi Yang , Zhen Yang , Peng-Chao Zhang , Wen-Ling Tian
Theoretical and Applied Fracture Mechanics ( IF 5.3 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.tafmec.2020.102637 Sheng-Qi Yang , Zhen Yang , Peng-Chao Zhang , Wen-Ling Tian
Abstract It is widely accepted that the strength, deformability, and failure behaviors of rock material are strongly influenced by widespread natural fissures. Research focusing on the crack initiation, propagation, and coalescence behavior in fissured rock material is important to ensure the reliability and predictability of rock engineering. However, the types and forms of pre-existing fissures are complex and variable; thus, mechanical experiments have rarely been conducted on rock samples containing non-straight prefabricated open fissures. In this research, the strength, deformability, and failure behaviors of sandstone samples containing a single non-straight fissure were systematically investigated by a series of uniaxial compression experiments and numerical simulations. First, the influence of the fissure angle (α) on the strength and deformation characteristics of red sandstone containing a single non-straight fissure was evaluated. Then, the ordinary state-based peridynamics model was used to investigate the fracture behavior of red sandstone specimens with respect to various α values. The results indicate that for α = 0°–15° and 75°–90°, tensile cracks first initiated from the convex points of the prefabricated fissure, and the crack initiation position transferred from the convex point to the tip of the prefabricated fissure for α = 30°–60°. In addition, for the α = 0°–90°, the cracks initiated in the form of tensile cracks, and the ultimate failure modes were mixed tensile and shear failure. Secondary cracks always appeared in the form of shear crack. Moreover, for α ≥ 75°, fewer cracks were initiated before the peak strength was reached; afterward, the crack initiations were more prolific, and more acoustic emission counts were observed.
中文翻译:
单轴压缩下含单条非直裂隙的红砂岩开裂行为试验及近场动力学模拟
摘要 岩石材料的强度、变形能力和破坏行为受到广泛的天然裂缝的强烈影响已被广泛接受。关注裂隙岩石材料中裂纹萌生、扩展和聚结行为的研究对于确保岩石工程的可靠性和可预测性具有重要意义。然而,原有裂缝的类型和形式复杂多变;因此,很少对包含非直预制开放裂缝的岩石样品进行力学实验。本研究通过一系列单轴压缩实验和数值模拟,系统地研究了含有单个非直裂缝的砂岩样品的强度、变形性和破坏行为。第一的,评价了裂隙角(α)对含有单条非直裂隙的红砂岩强度和变形特征的影响。然后,使用普通的基于状态的近场动力学模型来研究红砂岩试样在不同 α 值下的断裂行为。结果表明,对于α=0°~15°和75°~90°,拉伸裂纹首先从预制裂缝的凸点开始,裂纹萌生位置从凸点转移到预制裂缝的尖端。 α = 30°–60°。此外,对于α = 0°–90°,裂纹以拉伸裂纹的形式开始,最终破坏模式为拉伸和剪切混合破坏。二次裂纹总是以剪切裂纹的形式出现。此外,对于 α ≥ 75°,在达到峰值强度之前产生的裂纹较少;之后,裂纹萌生更加频繁,并且观察到更多的声发射计数。
更新日期:2020-08-01
中文翻译:
单轴压缩下含单条非直裂隙的红砂岩开裂行为试验及近场动力学模拟
摘要 岩石材料的强度、变形能力和破坏行为受到广泛的天然裂缝的强烈影响已被广泛接受。关注裂隙岩石材料中裂纹萌生、扩展和聚结行为的研究对于确保岩石工程的可靠性和可预测性具有重要意义。然而,原有裂缝的类型和形式复杂多变;因此,很少对包含非直预制开放裂缝的岩石样品进行力学实验。本研究通过一系列单轴压缩实验和数值模拟,系统地研究了含有单个非直裂缝的砂岩样品的强度、变形性和破坏行为。第一的,评价了裂隙角(α)对含有单条非直裂隙的红砂岩强度和变形特征的影响。然后,使用普通的基于状态的近场动力学模型来研究红砂岩试样在不同 α 值下的断裂行为。结果表明,对于α=0°~15°和75°~90°,拉伸裂纹首先从预制裂缝的凸点开始,裂纹萌生位置从凸点转移到预制裂缝的尖端。 α = 30°–60°。此外,对于α = 0°–90°,裂纹以拉伸裂纹的形式开始,最终破坏模式为拉伸和剪切混合破坏。二次裂纹总是以剪切裂纹的形式出现。此外,对于 α ≥ 75°,在达到峰值强度之前产生的裂纹较少;之后,裂纹萌生更加频繁,并且观察到更多的声发射计数。