爆后岩石裂隙结构可视化及定量表征方法
TD313; 爆后岩石破坏特征的定量表征一直是工程爆破领域急需解决的关键问题,爆后岩石裂纹萌生、扩展演化直至贯通的过程是导致岩石破裂的主要原因.为了研究被爆岩石内部裂纹扩展和断裂模式的演化过程,利用工业CT对爆后岩石进行扫描观测,通过图像堆栈矢量化处理构建岩石三维裂隙模型,并对裂纹结构特征参数进行统计分析,定量化表征岩石破坏程度及裂纹扩展情况.结合数值模拟分析爆炸冲击波压力的衰减规律,通过SEM电镜扫描试验研究爆破过程中不同位置岩石的微观形貌特征,对比断口元素成分变化与断裂模式的关联机制.研究结果表明:用等效球体方法对岩体内不同尺度裂隙结构进行统计分析,微裂隙数目多且分布均匀,主裂隙体积大且连...
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| Published in | 煤炭学报 Vol. 49; no. 3; pp. 1388 - 1402 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国矿业大学(北京)力学与土木工程学院,北京 100083
01.03.2024
中国矿业大学(北京)隧道工程灾变防控与智能建养全国重点实验室,北京 100083%中国矿业大学(北京)力学与土木工程学院,北京 100083 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-9993 |
| DOI | 10.13225/j.cnki.jccs.2023.0801 |
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| Abstract | TD313; 爆后岩石破坏特征的定量表征一直是工程爆破领域急需解决的关键问题,爆后岩石裂纹萌生、扩展演化直至贯通的过程是导致岩石破裂的主要原因.为了研究被爆岩石内部裂纹扩展和断裂模式的演化过程,利用工业CT对爆后岩石进行扫描观测,通过图像堆栈矢量化处理构建岩石三维裂隙模型,并对裂纹结构特征参数进行统计分析,定量化表征岩石破坏程度及裂纹扩展情况.结合数值模拟分析爆炸冲击波压力的衰减规律,通过SEM电镜扫描试验研究爆破过程中不同位置岩石的微观形貌特征,对比断口元素成分变化与断裂模式的关联机制.研究结果表明:用等效球体方法对岩体内不同尺度裂隙结构进行统计分析,微裂隙数目多且分布均匀,主裂隙体积大且连通性较好.随着裂隙等效球体直径的增加,裂隙表面积和体积整体上呈上升趋势;三维重构裂隙结构中裂隙率可以表征岩石局部裂纹扩展特征,爆炸近区裂隙率和三维分形维数远大于爆炸中远区的裂隙率和分形维数,说明岩石破裂过程中裂隙扩展演化主要在此阶段进行;相较于爆炸中远区,爆炸近区冲击波压力峰值高且衰减速率慢,使得整个爆破过程岩石微观断裂模式变化较大,大致呈现出由沿晶断裂向穿晶断裂、脆性断裂向塑性破坏的方向进行,非金属元素质量的变化对于各阶段断裂模式转变具有显著影响,断裂模式转变区域非金属元素质量发生明显减小.随着爆破作用的减弱,岩石破裂逐渐趋于无序和紊乱,破裂时断口也不限于解理面和晶粒边界. |
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| AbstractList | TD313; 爆后岩石破坏特征的定量表征一直是工程爆破领域急需解决的关键问题,爆后岩石裂纹萌生、扩展演化直至贯通的过程是导致岩石破裂的主要原因.为了研究被爆岩石内部裂纹扩展和断裂模式的演化过程,利用工业CT对爆后岩石进行扫描观测,通过图像堆栈矢量化处理构建岩石三维裂隙模型,并对裂纹结构特征参数进行统计分析,定量化表征岩石破坏程度及裂纹扩展情况.结合数值模拟分析爆炸冲击波压力的衰减规律,通过SEM电镜扫描试验研究爆破过程中不同位置岩石的微观形貌特征,对比断口元素成分变化与断裂模式的关联机制.研究结果表明:用等效球体方法对岩体内不同尺度裂隙结构进行统计分析,微裂隙数目多且分布均匀,主裂隙体积大且连通性较好.随着裂隙等效球体直径的增加,裂隙表面积和体积整体上呈上升趋势;三维重构裂隙结构中裂隙率可以表征岩石局部裂纹扩展特征,爆炸近区裂隙率和三维分形维数远大于爆炸中远区的裂隙率和分形维数,说明岩石破裂过程中裂隙扩展演化主要在此阶段进行;相较于爆炸中远区,爆炸近区冲击波压力峰值高且衰减速率慢,使得整个爆破过程岩石微观断裂模式变化较大,大致呈现出由沿晶断裂向穿晶断裂、脆性断裂向塑性破坏的方向进行,非金属元素质量的变化对于各阶段断裂模式转变具有显著影响,断裂模式转变区域非金属元素质量发生明显减小.随着爆破作用的减弱,岩石破裂逐渐趋于无序和紊乱,破裂时断口也不限于解理面和晶粒边界. |
| Abstract_FL | The quantitative characterization of post-blast rock damage has been a key problem in the field of engineering blasting,and the process of post-blast rock crack initiation,expansion and evolution until penetration is the main cause of rock rupture.In order to study the evolution process of crack expansion and fracture mode within the blasted rock,the in-dustrial CT was used to scan and observe the rock after the blast,a three-dimensional rock fissure model was constructed through image stack vectorization,and statistically the characteristic parameters of the crack structure were analyzed to quantitatively characterize the degree of rock damage and crack expansion.Combined with numerical simulation to ana-lyze the attenuation law of the explosion shock wave pressure,the SEM scanning test was used to study the micro-mor-phological characteristics of the rock at different locations during the blasting process,and to compare the correlation mechanism between the change of fracture elemental composition and the fracture mode.The results of the study show that using the equivalent sphere method to statistically analyze the fracture structure at different scales within the rock body,the number of microfractures is large and uniformly distributed,and the main fracture is large in volume and has good connectivity.With the increase of the diameter of the fracture equivalent sphere,the fracture surface area and volume exhibit an increase trend.The fracture rate in the three-dimensional reconstruction of the fracture structure can character-ize the local crack expansion characteristics of the rock,the fracture rate and three-dimensional fractal dimension of the near zone of the explosion is much larger than that in the far zone of the explosion,indicating that the fracture expansion in the fracture process of the rock evolution is carried out in this stage.Compared with the far zone of the explosion,the peak pressure is high and slow decay rate,making the entire blasting process of the rock microscopic fracture pattern changes,roughly presenting the direction from the fracture along the crystalline fracture to the fracture through the crystal-line fracture,brittle fracture to the direction of plastic damage.The changes in non-metallic elements have a significant im-pact on the transition of each stage of the fracture pattern,the fracture pattern transition region of the non-metallic ele-ments occurring in an obvious decrease in the content.With the weakening of the blasting effect,the rock rupture gradu-ally tends to be disordered and disorganized,and the fracture is not limited to the deconvoluted surface and grain boundar-ies during rupture. |
| Author | 王兆阳 付代睿 王雁冰 罗林 |
| AuthorAffiliation | 中国矿业大学(北京)力学与土木工程学院,北京 100083;中国矿业大学(北京)隧道工程灾变防控与智能建养全国重点实验室,北京 100083%中国矿业大学(北京)力学与土木工程学院,北京 100083 |
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| Author_FL | FU Dairui LUO Lin WANG Zhaoyang WANG Yanbing |
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| DocumentTitle_FL | Visualization and quantitative characterization methods of post-blast rock fracture structure |
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| Keywords | scanning electron microscopy 工业CT扫描 能谱仪 三维重构 industrial CT scanning 分形维数 blast mechanism fractal dimension 扫描电子显微镜 爆破机理 three-dimensional reconstruction energy spectroscopy |
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| PublicationTitle | 煤炭学报 |
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| Publisher | 中国矿业大学(北京)力学与土木工程学院,北京 100083 中国矿业大学(北京)隧道工程灾变防控与智能建养全国重点实验室,北京 100083%中国矿业大学(北京)力学与土木工程学院,北京 100083 |
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| Title | 爆后岩石裂隙结构可视化及定量表征方法 |
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