超高应变率下岩石的破坏机理
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1.天津大学;2.天津大学建筑工程学院岩土所

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Failure mechanism of rock under ultra-high strain rates
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1.tianjin university;2.Geotechnical Institute, School of Civil Engineering and Architecture, Tianjin University

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    摘要:

    在这项工作中,通过对大理石的轻气枪试验进行完整的3D数值模拟,探索了岩石在超高应变率下的破坏机理。 大理石试样中两个应力计的实际应力信号被用作数值模拟的匹配目标。 我们的结果表明,在冲击压缩载荷下,介观水压破坏应该是大理石的主要破坏机理,而不是介观的剪切或拉伸破坏。 此外,我们发现,要在不同的冲击速度下重现大理石的合理实验数据,有必要使用考虑时间非局部效应的介观速率相关的破坏模型。 最后,通过对具有不同孔隙度的虚拟岩石样本进行进一步的气枪数值试验,结果表明,岩石的孔隙度越大,在冲击压缩载荷下的动态强度和动力效应越小。

    Abstract:

    In this work, the failure mechanism of rock under ultra-high strain rate was explored through a full 3D numerical modelling of the light gas gun test of a marble. The actual stress signals of two stress gauges in the marble specimen were adopted as the matching target of the numerical simulation. Our results indicate that rather than mesoscopic shear or tensile failure, the mesoscopic hydro-compressive failure should be the main failure mechanism of the marble under shock compressive loading. Moreover, we found that to reproduce reasonable experimental data of the marble under different impact velocities, it is necessary to use a mesoscopic rate dependent failure model which takes the time non-local effect into account. Finally, through a further numerical gas gun tests of virtual rock specimens with various porosities, it is revealed that the larger the porosity of the rock, the less dynamic strength and dynamic effect under shock compressive loading.

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  • 收稿日期:2020-05-18
  • 最后修改日期:2020-09-27
  • 录用日期:2020-10-18
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