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Numerical simulation on effect of heterogeneity on mode I fracture characteristics of rock

非均质性对岩石I型断裂特性影响的数值模拟研究

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Abstract

Rock is more sensitive to tensile loading than compressive loading, since the tensile strength of rock is much lower than compressive strength. The fracture characteristics of rock in the tensile state are of great significance to the understanding of rock failure mechanisms. To this end, we have conducted numerical simulation researches on mode I cracking process of rock with varying homogeneity, using the Realistic Failure Process Analysis program. With the increase of homogeneity, cracks are concentrating to the ligament area with a decreasing number of crack bifurcations, and the main crack path is becoming smooth. Crack behaviors and mechanical properties are influenced significantly when the homogeneity index is in the range of 1.5 to 5. When the homogeneity index is greater than 30, they are not affected by rock homogeneity and the rock can be considered as essentially homogeneous. It is considered that the global and local strengths are affected by the distribution of rock mechanical properties at mesoscale, which influence the crack behaviors and mechanical characteristics.

摘要

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。

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Authors and Affiliations

  1. School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China

    Jin-tao Wang  (王金涛) & Jian-ping Zuo  (左建平)

  2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology-Beijing, Beijing, 100083, China

    Jian-ping Zuo  (左建平)

Authors
  1. Jin-tao Wang  (王金涛)
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  2. Jian-ping Zuo  (左建平)
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Contributions

WANG Jin-tao conducted the numerical simulation and wrote the first draft of the manuscript. ZUO Jian-ping provided the ideas and edited the draft of the manuscript.

Corresponding author

Correspondence to Jian-ping Zuo  (左建平).

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Conflict of interest

WANG Jin-tao and ZUO Jian-ping declare that they have no conflict of interest.

Foundation item: Project(BJJWZYJH01201911413037) supported by the Beijing Outstanding Young Scientist Program, China; Projects(51622404, 41877257) supported by the National Natural Science Foundation of China; Project (2018SMHKJ-A-J-03) supported by Shaanxi Coal Group Key Project, China

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Wang, Jt., Zuo, Jp. Numerical simulation on effect of heterogeneity on mode I fracture characteristics of rock. J. Cent. South Univ. Technol. 27, 3063–3077 (2020). https://doi.org/10.1007/s11771-020-4529-1

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