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含孔洞大理岩破坏特性的颗粒流分析

黎崇金 李夕兵 李地元

黎崇金, 李夕兵, 李地元. 含孔洞大理岩破坏特性的颗粒流分析[J]. 工程科学学报, 2017, 39(12): 1791-1801. doi: 10.13374/j.issn2095-9389.2017.12.003
引用本文: 黎崇金, 李夕兵, 李地元. 含孔洞大理岩破坏特性的颗粒流分析[J]. 工程科学学报, 2017, 39(12): 1791-1801. doi: 10.13374/j.issn2095-9389.2017.12.003
LI Chong-jin, LI Xi-bing, LI Di-yuan. Particle flow analysis of fracture characteristics of marble with a single hole[J]. Chinese Journal of Engineering, 2017, 39(12): 1791-1801. doi: 10.13374/j.issn2095-9389.2017.12.003
Citation: LI Chong-jin, LI Xi-bing, LI Di-yuan. Particle flow analysis of fracture characteristics of marble with a single hole[J]. Chinese Journal of Engineering, 2017, 39(12): 1791-1801. doi: 10.13374/j.issn2095-9389.2017.12.003

含孔洞大理岩破坏特性的颗粒流分析

doi: 10.13374/j.issn2095-9389.2017.12.003
基金项目: 

国家自然科学基金资助项目(11472311,41630642);中南大学中央高校基本科研业务费专项资金资助项目(2017zzts538)

详细信息
  • 中图分类号: TU452

Particle flow analysis of fracture characteristics of marble with a single hole

  • 摘要: 基于室内单轴压缩试验结果,利用颗粒流程序PFC2D,模拟含预制孔洞大理岩在单轴和双轴压缩条件下的破坏过程,分析预制孔洞形状、围压大小以及岩石非均质性对大理岩力学特性和裂纹扩展的影响.数值结果表明:与完整大理岩试样相比,含孔洞试样的峰值强度显著降低,降低程度与孔洞形状有关;围压对含孔洞大理岩试样的力学特性和裂纹扩展有显著影响,含孔洞试样的峰值强度随围压的增加而增加,但偏应力峰值随围压的增加呈先增大后减小的变化趋势;试样的破坏模式与孔洞形状相关,含圆形孔洞试样为类X型剪切破坏,含矩形孔洞或马蹄形孔洞试样为对角剪切破坏;岩石内部的矿物结核影响了裂纹的扩展路径,从而改变试样的宏观破坏模式.微观机理分析表明:孔洞周边裂纹的萌生与扩展过程伴随着应力集中区的释放与转移;含孔洞试样的宏观裂纹有3种模式:孔壁剥落、拉伸裂纹和压剪裂纹.
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  • 收稿日期:  2017-01-16

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