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为探讨岩体的节理接触面积对应力波传播规律的影响,采用分离式霍普金森压杆试验装置开展试验研究,分析不同接触面积比的节理的动态力学特性以及节理的接触面积几何分布对应力波传播特性的影响。人工切槽的岩块与完整岩块组合得到不同接触面积比的节理岩块作为试样。通过一系列的实验,得到以下的结论:节理的接触面积比、接触面积分布和冲头冲击速率不仅影响节理岩块的动态力学特性而且影响应力波的传播。应力波的透射系数与冲头冲击速率、节理面大小及相对密集度(即接触面分布离散和接触面分布紧凑)有关;当节理接触面的几何相对密集度一定时,应力波透射系数随着节理接触面积比的增大呈线性增长,且透射系数随冲头速率的增大而增大;此外,相对于节理接触面积小但分布离散的岩体,应力波通过接触面积大、分布紧凑的节理的衰减更为明显。
In order to investigate the influence of the joint contact area of rock mass on the stress wave propagation, the split Hopkinson pressure bar test device was used to conduct the experimental study. The dynamic mechanical properties of the joints with different contact area ratios and the geometrical distribution of the contact area of the joints were analyzed. Influence of wave propagation characteristics. Artificially grooving blocks and intact blocks are combined to obtain jointed rock blocks with different contact area ratios as samples. Through a series of experiments, the following conclusions are obtained: The contact area ratio, contact area distribution and punch impact rate of joints not only affect the dynamic mechanical properties of joints but also affect the propagation of stress waves. The transmission coefficient of stress wave is related to the punch impact velocity, joint size and relative density (ie, the contact surface distribution is discrete and the contact surface is compactly distributed). When the geometrical relative density of contact surface is constant, the transmission coefficient of stress wave The contact area ratio increases linearly and the transmission coefficient increases with the increase of punch rate. In addition, compared with the small contact area of joints but distributed discrete rock mass, the stress wave passes through large contact area and compact distribution Joint attenuation more obvious.