非均质性对岩石Ⅰ型断裂特性影响的数值模拟研究(英文)
发布时间:2020-12-31 00:29
由于岩石的抗拉强度远低于其抗压强度,其对拉伸荷载比压缩荷载更加敏感。因此研究拉伸荷载下岩石的断裂特性对于深入理解岩石的破坏机制具有重要意义。本研究中,作者利用岩石破坏过程分析系统RFPA,对不同均质度岩石Ⅰ型裂纹扩展过程展开了研究。随着岩石均质程度的提高,裂纹逐渐向韧带区域集中,并且裂纹分叉逐渐减少,主裂纹趋于平滑。当均质度在1.5~5区间内,岩石裂纹行为和力学性能受均质度的影响比较严重。当均质度大于30时,二者基本不受均质度差异的影响,此时岩石可基本上认为是均质材料。细观尺度上岩石力学性质分布影响了岩石整体和局部强度,进而影响了裂纹行为。
【文章来源】:Journal of Central South University. 2020年10期
【文章页数】:15 页
【文章目录】:
1 Introduction
2 A brief introduction to numerical method
3 Numerical model and boundary conditions
4 Effects of rock homogeneity on crack behaviors
4.1 Cracking process
4.2 Subcritical crack length during tensile loading
4.3 R curves
5 Effects of rock homogeneity on macro-mechanical properties
5.1 Stress-strain curve and uniaxial tensile strength
5.2 Initial cracking toughness and unstable fracture toughness
5.3 Acoustic emissions and damage evolutions
6 Conclusions
Contributors
Conflict of interest
【参考文献】:
期刊论文
[1]岩石非均质度对其力学性能的影响研究[J]. 罗荣,曾亚武,曹源,黎玲. 岩土力学. 2012(12)
本文编号:2948589
【文章来源】:Journal of Central South University. 2020年10期
【文章页数】:15 页
【文章目录】:
1 Introduction
2 A brief introduction to numerical method
3 Numerical model and boundary conditions
4 Effects of rock homogeneity on crack behaviors
4.1 Cracking process
4.2 Subcritical crack length during tensile loading
4.3 R curves
5 Effects of rock homogeneity on macro-mechanical properties
5.1 Stress-strain curve and uniaxial tensile strength
5.2 Initial cracking toughness and unstable fracture toughness
5.3 Acoustic emissions and damage evolutions
6 Conclusions
Contributors
Conflict of interest
【参考文献】:
期刊论文
[1]岩石非均质度对其力学性能的影响研究[J]. 罗荣,曾亚武,曹源,黎玲. 岩土力学. 2012(12)
本文编号:2948589
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