Filled inclusions in rock discontinuities play a key role in the mechanical characteristics of the rock and thereby influence the stability of rock engineering. In this study, a series of impact tests were performed using a split Hopkinson pressure bar system with high-speed photography to investigate the effect of interlayer strength on the wave propagation and fracturing process in composite rock-mortar specimens. The results indicate that the transmission coefficient, nominal dynamic strength, interlayer closure, and specific normal stiffness generally increase linearly with increasing interlayer stiffness. The cement mortar layer can serve as a buffer during the deformation of composite specimens. The digital images show that tensile cracks are typically initiated at the rock-mortar interface, propagate along the loading direction, and eventually result in a tensile failure regardless of the interlayer properties. However, when a relatively weaker layer is sandwiched between the rock matrix, an increasing amount of cement mortar is violently ejected and slight slabbing occurs near the rock-mortar interface.

岩石间断面中的充填包裹体对岩石的力学特性起着关键作用，进而影响岩石工程的稳定性。在这项研究中，使用带有高速摄影的分裂式霍普金森压力杆系统进行了一系列冲击试验，以研究层间强度对复合岩浆试样中波传播和破裂过程的影响。结果表明，传输系数、标称动态强度、层间闭合和比法向刚度通常随着层间刚度的增加而线性增加。水泥砂浆层可在复合试件变形过程中起到缓冲作用。数字图像显示，拉伸裂缝通常在岩浆界面处开始，沿加载方向传播，并最终导致拉伸失效，无论夹层性能如何。然而，当相对较弱的层夹在岩石基质之间时，越来越多的水泥砂浆被猛烈喷射，并且在岩石-砂浆界面附近出现轻微的板坯。