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| 含不同倾角单裂隙岩石单轴压缩破裂演化过程分析 |
| Analysis of fracture evolution process of single fractured rock mass based on uniaxial compression |
| 投稿时间：2023-11-28 修订日期：2024-01-09 |
| DOI： |
| 中文关键词: 单裂隙 裂纹演化 数字散斑 声发射 单轴压缩 |
| 英文关键词:Single fissure crack evolution digital speckle acoustic emission uniaxial compression |
| 基金项目:国家重点研发计划(2017YFC1503101) |
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| 摘要点击次数: 249 |
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| 中文摘要: |
| 为探究裂隙倾角对裂隙岩体破裂演化过程的影响,论文通过对不同裂隙倾角岩体进行单轴压缩实验,采用数字散斑和声发射方法作为观测手段,探究含不同裂隙倾角岩体的破裂演化过程,分析了不同单裂隙岩体表面及其内部裂纹的演化规律。结果表明：裂隙岩体的变形破坏过程仍表现为原始裂隙压密、弹性变形、塑性变形及破坏四个阶段；随着裂隙倾角的增大,应力的峰值即抗压强度呈现先减小后增大的趋势；当岩体表面裂纹处于稳定扩展阶段时,裂纹首先沿着预制裂隙端部起裂,然后裂纹一直扩展,最终形成贯通,直至表面裂纹发展至非稳定扩展阶段,最终形成裂隙岩体宏观破坏；当α=0°时,岩体表现出较明显的张拉破坏,当α＝30°、45°和60°时,岩石呈现出以剪切为主的组合破坏,当裂隙倾角为当α=90°时,岩体发生张拉破坏；通过振铃计数,展现了单裂隙岩体内部裂纹的演化过程,在压密初期,岩体内部存在大量孔隙,随着应力的增加,原生空隙逐渐被压合,随着变形的增加,岩体进入弹性变形阶段,岩体内部产生裂纹,进入弹性变形后期,内部裂纹逐渐扩展,直至岩体失稳破坏；裂隙倾角的改变,内部结构受到了不同程度的影响,内部裂纹扩展情况产生差异,导致单裂隙岩体塑性变形阶段来临时间呈现先减小后增加的趋势； 论文可为含裂隙岩体工程的长期稳定性分析及复杂裂隙岩体的力学行为研究提供参考。 |
| 英文摘要: |
| In order to investigate the influence of fissure inclination angle on the rupture evolution process of fissured rock body, the paper investigates the rupture evolution process of rock body containing different fissure inclination angles through uniaxial compression experiments on different fissure inclination angles, adopts the digital scattering and acoustic emission methods as the observation means, and analyzes the evolution law of the surface of the different single fissure rock body and its internal cracks. The results show that: the deformation and damage process of the fissured rock body is still manifested in four stages: original fissure compaction, elastic deformation, plastic deformation and damage; with the increase of fissure inclination, the peak stress, i.e., the compressive strength, shows a tendency of decreasing and then increasing; when the surface cracks of the rock body are at the stage of stable expansion, the cracks will firstly start along the end of the prefabricated fissure, and then the cracks will keep on expanding, and ultimately form a penetrating until the surface cracks develops to the unstable expansion stage, and eventually forms the macro-damage of the fissured rock body; when α=0°, the rock body shows more obvious tensile damage, when α=α=30°, 45° and 60°, the rock shows a combination of shear-based damage, and when the inclination angle of the fissure is when α=90°, the rock body undergoes tensile damage; through the vibration bell counting, it shows the evolution of the cracks within the single-fissured rock body, and in the compression density At the early stage, there are a large number of pores inside the rock body, with the increase of stress, the primary voids are gradually compressed, with the increase of deformation, the rock body enters the elastic deformation stage, cracks are generated inside the rock body, and in the late stage of elastic deformation, the internal cracks are gradually expanded until the rock body is destabilized and damaged; the change of the cleft inclination angle, the internal structure has been affected by a different degree of influence, which results in the difference of the expansion of the internal cracks and finally The time of plastic deformation stage presents a tendency of decreasing and then increasing. The paper can provide a reference for the long-term stability analysis of rift-containing rock body engineering and the study of the mechanical behavior of complex rift rock bodies. |
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