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品质因子是衡量岩体中应力波衰减特性的一个重要参数。利用分离式霍普金森压杆实验系统对含人工节理花岗岩试样进行单轴冲击压缩实验,研究节理吻合系数(JMC)对岩体试样品质因子的影响。首先,根据品质因子基本概念得出了利用应力波能量计算品质因子的方法,并证明在试样严格满足应力均匀条件时,其与应力–应变曲线方法是等价的。然后,用三波法得到了节理试样的应力–应变曲线,同时用应力波能量方法计算了品质因子。实验结果表明:随着节理吻合系数(JMC)降低,应力–应变曲线滞回环面积增加,节理岩体试样的动态割线模量和品质因子均减小,说明节理接触面积减小弱化了整个试样并且使试样能量耗散能力增加。
The quality factor is an important parameter to measure the attenuation characteristics of stress waves in rock mass. The uniaxial impact compression test of the artificial joint granite samples was carried out by using the split Hopkinson pressure bar experimental system to study the effect of the joint coefficient of coincidence (JMC) on the quality factor of the rock mass samples. First of all, based on the basic concept of quality factor, the method of calculating the quality factor by using the stress wave energy is derived. It is proved that the method is equivalent to the stress-strain curve method when the stress distribution of the sample is strictly satisfied. Then, the stress-strain curves of the joints were obtained by the three-wave method, and the quality factor was calculated by the stress wave energy method. The experimental results show that the dynamic secant modulus and quality factor of the jointed rock mass decrease with the decrease of the JMC and the increase of the hysteresis loop of the stress-strain curve, which means that the reduction of the contact area of the joint weakens the whole The sample also increases the energy dissipation capacity of the sample.