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玄武岩三维细观孔隙模型重构与直接拉伸数值试验

郎颖娴 梁正召 董卓

郎颖娴, 梁正召, 董卓. 玄武岩三维细观孔隙模型重构与直接拉伸数值试验[J]. 工程科学学报, 2019, 41(8): 997-1006. doi: 10.13374/j.issn2095-9389.2019.08.005
引用本文: 郎颖娴, 梁正召, 董卓. 玄武岩三维细观孔隙模型重构与直接拉伸数值试验[J]. 工程科学学报, 2019, 41(8): 997-1006. doi: 10.13374/j.issn2095-9389.2019.08.005
LANG Ying-xian, LIANG Zheng-zhao, DONG Zhuo. Three-dimensional microscopic model reconstruction of basalt and numerical direct tension tests[J]. Chinese Journal of Engineering, 2019, 41(8): 997-1006. doi: 10.13374/j.issn2095-9389.2019.08.005
Citation: LANG Ying-xian, LIANG Zheng-zhao, DONG Zhuo. Three-dimensional microscopic model reconstruction of basalt and numerical direct tension tests[J]. Chinese Journal of Engineering, 2019, 41(8): 997-1006. doi: 10.13374/j.issn2095-9389.2019.08.005

玄武岩三维细观孔隙模型重构与直接拉伸数值试验

doi: 10.13374/j.issn2095-9389.2019.08.005
基金项目: 

国家重点研发计划资助项目(2016YFB0201000)

国家自然科学基金资助项目(51779031,51878190)

详细信息
  • 中图分类号: TG142.71

Three-dimensional microscopic model reconstruction of basalt and numerical direct tension tests

  • 摘要: 由于岩石材料的不透明性和多孔隙特性,通过传统的物理试验或数值模拟很难真实体现其内部三维细观结构. 本文基于CT扫描技术、边缘检测算法、滤波算法、三维点阵映射与重构算法,构建了可以表征玄武岩试样内部孔隙结构的三维细观非均匀数值模型. 结合并行计算进行直接拉伸数值试验,研究了内部孔隙结构特征对试样破坏机制及抗拉强度的影响. 研究结果表明:加载初期在试样孔隙处产生初始裂纹,随着荷载的增加初始裂纹逐渐沿横向扩展最终形成宏观拉伸破坏裂纹,并且孔隙含量和分布位置对试样拉伸断裂的位置具有重要影响. 随着孔隙率增高,试样破坏过程中的声发射数目和能量逐渐减小. 拉伸破坏模式呈现脆性破坏特征,同时孔隙的存在削弱了试样的抗拉强度.
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出版历程
  • 收稿日期:  2018-07-18

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