| 花岗岩颗粒流模型循环压缩作用下裂纹特征分析 |
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| 引用本文： | 龙恩林,陈俊智.花岗岩颗粒流模型循环压缩作用下裂纹特征分析[J].中国安全生产科学技术,2019,15(4):39-44. |
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| 作者姓名： | 龙恩林 陈俊智 |
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| 作者单位： | （昆明理工大学 国土资源工程学院，云南 昆明 650093） |
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| 基金项目： | 基金项目: 国家自然科学基金项目（U1602232） |
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| 摘 要： | 为了分析花岗岩颗粒流模型循环作用下的裂纹特征,基于花岗岩单轴压缩试验得到的应力应变曲线,完成了PFC3D数值试验的参数标定,探讨了不同循环次数下数值试件内部裂纹数目、分布和角度的变化规律。研究结果表明:平行黏结模型能够正确表达花岗岩的主要力学性质;在数值试验加载至破坏过程中,裂纹数目以应力应变曲线峰值点为分界,峰后阶段产生的裂纹数占总裂纹数的60%～90%;张剪裂纹最初产生于试件两端,随着加载进行,裂纹向着试件中部发展贯通,最终形成宏观剪切破坏带;剪切裂纹的角度分布方向明显,与轴向加载方向相同;张拉裂纹角度分布则在轴向加载方向和水平方向上略显集中。研究结果可为矿山安全回采矿柱提供依据。
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| 关 键 词： | 花岗岩 单轴循环压缩 颗粒流数值模拟 裂纹演化 |
Analysis of crack characteristics of granite particle flow model under cyclic compression |
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| LONG Enlin,CHEN Junzhi.Analysis of crack characteristics of granite particle flow model under cyclic compression[J].Journal of Safety Science and Technology,2019,15(4):39-44. |
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| Authors: | LONG Enlin CHEN Junzhi |
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| Affiliation: | (School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China) |
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| Abstract: | Based on the stress strain curves of laboratory uniaxial compression tests for granite samples, the parameters of PFC3D numerical tests are calibrated, and the variation of the number, distribution and angle of internal cracks in the numerical specimens are discussed under different cycle conditions. The results show that the parallel bonding model can correctly express the main mechanical properties of granite; the number of cracks is divided by the peak point of stress strain curve in the process of loading to failure of numerical specimens, and the number of cracks generated in the post peak stage accounts for 60%-90% of the total number of cracks; the tension shear cracks are initially generated at both ends of the specimens, and with the loading proceeding, the cracks develop and penetrate into the middle of the specimens. Macroscopic shear failure zone is formed eventually; the angular distribution direction of shear crack is obvious, which is the same as the direction of axial loading; the angualr distribution of tension crack is slightly concentrated in the direction of axial loading and horizontal loading. |
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| Keywords: | granite uniaxial cyclic compression numerical simulation of particle flow crack evolution |
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