Abstract Stability and safety of rock structures are easily influenced by the dynamic disturbance, especially when weak joint planes exist. In order to investigate the filling joint effect on the dynamic response of rock specimens, a series of impact dynamic tests were conducted by a modified split Hopkinson pressure bar (SHPB) system. A sandwich type of sandstone specimens filling with different thicknesses layer of cemented mortar (filling joint) were tested in the study. The results show that the transmission coefficient, dynamic strength and energy absorption all decrease with increasing joint thickness. However, the reflection coefficient, peak strain and joint closure show an opposite variation trend. In addition, the deformation of the cemented mortar joint is the main reason to cause the deformation and final failure of jointed rock specimens. Tensile cracks dominate the fracturing behavior during the dynamic loading, but they have a slight influence on the final failure mode which transforms from localized slabbing to axial splitting failure with the filling joint becoming thicker.

中文翻译：

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不同厚度水泥砂浆接缝岩石试样应力波传播及能量特​​性试验研究

摘要 岩石结构的稳定性和安全性容易受到动力扰动的影响，尤其是存在弱节理面时。为了研究充填缝对岩石试样动力响应的影响，采用改进的分体式霍普金森压力棒（SHPB）系统进行了一系列冲击动力试验。在研究中测试了夹层型砂岩试样，其中填充了不同厚度的水泥砂浆层（填充接缝）。结果表明，随着接头厚度的增加，传输系数、动态强度和能量吸收均降低。然而，反射系数、峰值应变和接头闭合显示出相反的变化趋势。此外，胶结砂浆接缝变形是引起接缝岩石试件变形和最终破坏的主要原因。拉伸裂纹在动态加载过程中主导破裂行为，但它们对最终破坏模式有轻微影响，最终破坏模式从局部板坯向轴向劈裂破坏转变，填充接头变厚。