通过波速的连续实时监测研究单轴压缩时脆性岩石的细观损伤过程和损伤机制
本文通过对一种脆性岩石(大理石)单轴压缩过程中不同方向波速的实时连续测量研究其细观损伤发展过程和损伤机制.试验结果显示,在单轴压缩过程中,由于试件内部损伤发展在不同方向上的差异,使得其波速逐渐呈现各向异性.为了描述轴向加载过程中波速的变化,我们提出了一个与试件内部各向异性裂纹演化相关的波速模型.在此基础上,通过横贯各向同性的力学模型和自洽损伤模型可以得到该试件等效弹性参数和内部裂纹密度的变化.分析结果显示:在单轴压缩过程中,该脆性岩石的损伤破坏主要是由轴向裂纹的不断积累增多导致的;斜向剪切裂纹的快速增多伴随着宏观裂纹的出现....
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| Published in | 中南大学学报（英文版） Vol. 28; no. 2; pp. 556 - 571 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
2021
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| Subjects | |
| Online Access | Get more information |
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| Abstract | 本文通过对一种脆性岩石(大理石)单轴压缩过程中不同方向波速的实时连续测量研究其细观损伤发展过程和损伤机制.试验结果显示,在单轴压缩过程中,由于试件内部损伤发展在不同方向上的差异,使得其波速逐渐呈现各向异性.为了描述轴向加载过程中波速的变化,我们提出了一个与试件内部各向异性裂纹演化相关的波速模型.在此基础上,通过横贯各向同性的力学模型和自洽损伤模型可以得到该试件等效弹性参数和内部裂纹密度的变化.分析结果显示:在单轴压缩过程中,该脆性岩石的损伤破坏主要是由轴向裂纹的不断积累增多导致的;斜向剪切裂纹的快速增多伴随着宏观裂纹的出现. |
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| AbstractList | 本文通过对一种脆性岩石(大理石)单轴压缩过程中不同方向波速的实时连续测量研究其细观损伤发展过程和损伤机制.试验结果显示,在单轴压缩过程中,由于试件内部损伤发展在不同方向上的差异,使得其波速逐渐呈现各向异性.为了描述轴向加载过程中波速的变化,我们提出了一个与试件内部各向异性裂纹演化相关的波速模型.在此基础上,通过横贯各向同性的力学模型和自洽损伤模型可以得到该试件等效弹性参数和内部裂纹密度的变化.分析结果显示:在单轴压缩过程中,该脆性岩石的损伤破坏主要是由轴向裂纹的不断积累增多导致的;斜向剪切裂纹的快速增多伴随着宏观裂纹的出现. |
| Abstract_FL | In this study, the micro-failure process and failure mechanism of a typical brittle rock under uniaxial compression are investigated via continuous real-time measurement of wave velocities. The experimental results indicate that the evolutions of wave velocities became progressively anisotropic under uniaxial loading due to the direction-dependent development of micro-damage. A wave velocity model considering the inner anisotropic crack evolution is proposed to accurately describe the variations of wave velocities during uniaxial compression testing. Based on which, the effective elastic parameters are inferred by a transverse isotropic constitutive model, and the evolutions of the crack density are inversed using a self-consistent damage model. It is found that the propagation of axial cracks dominates the failure process of brittle rock under uniaxial loading and oblique shear cracks develop with the appearance of macrocrack. |
| Author | 吴志军 王智洋 范立峰 翁磊 刘泉声 |
| Author_FL | WENG Lei WU Zhi-jun FAN Li-feng LIU Quan-sheng WANG Zhi-yang |
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| Author_xml | – sequence: 1 fullname: 吴志军 – sequence: 2 fullname: 王智洋 – sequence: 3 fullname: 范立峰 – sequence: 4 fullname: 翁磊 – sequence: 5 fullname: 刘泉声 |
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| DocumentTitle_FL | Micro-failure process and failure mechanism of brittle rock under uniaxial compression using continuous real-time wave velocity measurement |
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| Keywords | 理论与建模 脆性破坏 continuous real-time measurement 实时连续测量 弹性波波速 uniaxial compression test anisotropic damage evolution 各向异性损伤演化 brittle rock failure 单轴压缩 theory and modelling elastic wave velocity |
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| Title | 通过波速的连续实时监测研究单轴压缩时脆性岩石的细观损伤过程和损伤机制 |
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