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利用φ100 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。
The impact compression tests under different loading rates of marble subjected to different high temperatures were carried out by using φ100 mm split Hopkinson pressure bar device. The relationship between peak stress, peak strain, elastic modulus and loading rate was studied. The results show that both the peak stress and the peak strain of marble show a significant strengthening effect of loading rate and a nearly linear increase with the loading rate after high temperature. However, the strengthening effect of loading rate of peak stress is obviously weakened after 800 ℃ The loading effect of the peak strain is obviously strengthened. The correlation between the loading rate of the elastic modulus of marble and the elastic modulus of the marble is not obvious at high temperature. With the increase of the temperature, the elastic modulus decreases gradually. With the increase of the loading rate Of the increase, the elastic modulus remained unchanged. Combined with the microstructure characteristics, energy absorption and stress state of rock materials, the loading mechanism of rock dynamic mechanical properties is discussed.