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许金余, 刘石. 加载速率对高温后大理岩动态力学性能的影响研究[J]. 岩土工程学报, 2013, 35(5): 879-883.
引用本文: 许金余, 刘石. 加载速率对高温后大理岩动态力学性能的影响研究[J]. 岩土工程学报, 2013, 35(5): 879-883.
XU Jin-yu, LIU Shi. Effect of impact velocity on dynamic mechnaical behaviors of marble after high temperatures[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(5): 879-883.
Citation: XU Jin-yu, LIU Shi. Effect of impact velocity on dynamic mechnaical behaviors of marble after high temperatures[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(5): 879-883.

加载速率对高温后大理岩动态力学性能的影响研究

Effect of impact velocity on dynamic mechnaical behaviors of marble after high temperatures

  • 摘要: 利用100 mm分离式Hopkinson压杆装置,对经历不同高温后的大理岩进行不同加载速率下的冲击压缩试验,研究了峰值应力、峰值应变、弹性模量等与加载速率的关系。试验结果表明,高温后大理岩的峰值应力、峰值应变均表现出显著的加载速率强化效应,随加载速率的提高而近似线性增加,但800℃之后,峰值应力的加载速率强化效应明显减弱,而峰值应变的加载速率强化效应明显加强;高温后大理岩弹性模量的加载速率相关性并不明显,随着温度的升高,弹性模量逐渐减小,到1000℃高温时,随着加载速率的增加,弹性模量基本保持不变。结合岩石材料的微观结构特征、能量吸收以及受力状态等对岩石动态力学性能的加载速率强化效应机理进行了探讨。

     

    Abstract: The tests on marble after different temperatures under dynamic loading at different impact velocities are carried out by using the split Hopkinson pressure bar (SHPB) apparatus 100 mm in diameter. The influences of impact velocity on the peak stress, peak strain and elastic modulus are studied. The test results show that the peak stress and peak strain after the same temperature increase linearly with the increasing impact velocity. When the temperature is above 800℃, the peak stress increases slightly and the peak strain increases obviously with the increase of impact velocity. However, the elastic modulus has no obvious impact velocity effect. The elastic modulus gradually declines with the increase of temperature. When the temperature reaches 1000℃, the elastic modulus nearly does not change with the variation of impact velocity. Considering the microstructure characteristics and the energy absorbency of marble, the effect of impact velocity on the dynamic mechanical characteristics is analyzed.

     

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