Abstract:To examine how cementitious filler material reacts to blasting loads with varying axial envelope pressures, we conducted 3D dynamic and static impact tests on the material. The cement content was 180 kg/m³ and the mass concentration was 72%. The results of the experiment indicate that over 80% of the dynamic incident energy is reflected, with less than 10% of the energy passing through the specimen. Additionally, the energy required for deformation failure of the specimen is minimal. The peak value of the dynamic strength of the specimen is significantly influenced by the axial confining pressure, which initially increases and subsequently decreases. When axial confining pressure is applied, the specimens fail due to tension and the failure surface is perpendicular to the direction of load. These findings contribute to the understanding of material ratio and stability in downhole cemented backfill research.