Abstract Blasting in rocks typically causes the remaining rock mass to be subjected to varying degrees of damage and failure, leading to a decline in the mechanical properties and bearing capacity of the surrounding rock. In this study, a decoupled charge blasting experiment for small-charge small-scale red sandstone specimens was conducted in a laboratory; the damaged specimens (after blasting) were scanned and reconstructed using computed tomography (CT) scanning and three-dimensional reconstruction technology. The relationship between the gray-scale change characteristics of the CT images and the decoupling coefficient was analyzed. Additionally, the analysis dimensions and damage degree of the damaged specimens (after blasting) were calculated and the damage degree of the indoor small-scale samples (after blasting) was quantitatively evaluated. Furthermore, the relationship between the decoupling coefficient and the blasting action was examined using the LS-DYNA simulation software. The results indicated that the gray-scale value tended to increase with the decoupled coefficient, and the decoupled coefficient demonstrated a significant influence on the blasting action. Thus, the proposed method serves as a suitable means for the evaluation of the failure mechanism through the reconstruction of the spatial distribution of internal cracks.

中文翻译：

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基于计算机断层扫描的解耦装药爆破爆炸传播及岩石损伤特征

摘要 岩石爆破通常会使剩余岩体受到不同程度的破坏和破坏，导致围岩力学性能和承载力下降。本研究在实验室进行了小装药小尺度红砂岩试件的解耦装药爆破试验；使用计算机断层扫描（CT）扫描和三维重建技术对损坏的标本（爆破后）进行扫描和重建。分析了CT图像灰度变化特征与解耦系数的关系。此外，还计算了损伤试样（爆破后）的分析尺寸和损伤程度，并对室内小规模试样（爆破后）的损伤程度进行了定量评价。此外，解耦系数与爆破作用之间的关系使用 LS-DYNA 模拟软件进行了检查。结果表明，灰阶值随着解耦系数的增加而增加，解耦系数对爆破作用有显着影响。因此，所提出的方法可作为一种合适的手段，通过重建内部裂纹的空间分布来评估失效机制。