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首页> 外文期刊>Arabian Journal for Science and Engineering >Mechanical Characteristics and Damage Evolution Law of Sandstone with Prefabricated Cracks Under Cyclic Loading
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Mechanical Characteristics and Damage Evolution Law of Sandstone with Prefabricated Cracks Under Cyclic Loading

机译：循环加载下预制裂缝的砂岩机械特性及损伤演化法

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摘要

To study the damage evolution laws of red sandstone samples with prefabricated cracks under cyclic uniaxial compression, physical tests were conducted. In this research, the stress–strain curve characteristics, failure process characteristics, strength, and deformation properties of the cracked sandstone specimens were studied under different cracked geometric parameters (α, β) and cyclic loads. The experimental results revealed that the elasticity modulus, deformation modulus, residual strength, and peak strength increased linearly with the number of loading cycles. Additionally, the failure modes of the samples transition from brittle failure under a small number of loading cycles to ductile failure under a high number of loading cycles. The elastic modulus and peak strength of all the specimens under cyclic loading showed a “strengthening” phenomenon. With increasing crack dip angle (α), the peak strength and crack initiation stress first increased and then decreased. However, with the increase in the crack bridge inclination angle (β), the peak strength and crack initiation stress first decreased and then increased. By using the fitting analysis of the damage evolution equation, it was proven that the damage variable method is suitable for describing the damage evolution characteristics of cracked sandstone.
机译：为在循环单轴压缩下采用预制裂缝的红色砂岩样品的损伤演化法，进行了物理测试。在该研究中，在不同裂纹的几何参数（α，β）和循环负载下，研究了裂纹砂岩样本的应力 - 应变曲线特性，失效处理特性，强度和变形性质。实验结果表明，弹性模量，变形模量，残余强度和峰值强度随着装载循环的数量而线性增加。另外，样品的失效模式在大量装载循环下在少量加载循环下从脆性失败转变为延展性故障。环状载荷下所有标本的弹性模量和峰强度显示出“强化”现象。随着裂缝倾角（α）的增加，峰强度和裂纹启动应力首先增加，然后降低。然而，随着裂缝桥倾斜角（β）的增加，峰强度和裂纹引发应力首先降低，然后增加。通过使用损伤进化方程的拟合分析，证明了损伤可变方法适用于描述裂纹砂岩的损伤演化特性。

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