Study on protection characteristics of slotted cartridge based on SHPB
In order to explore the protective characteristics of slotted cartridge on surrounding rock in directional fracture-controlled blasting,SHPB was used to impact the granite block protected by the gasket made of the slotted cartridge material.The influence of gasket and rock spacing,gasket material and gasket thickness factors on the protective effect of surrounding rock was studied respectively.The crushing condition and stress peak of rock under high-speed impact were analyzed,and the numerical model of single-hole blasting of multiple slotted cartridge was established.By comparing the damage of surrounding rock under different conditions,the protective characteristic mechanism of slotted cartridge on surrounding rock was further revealed.The results show that the fragmentation degree of the rock is serious under a strong impact load,and the fragmentation degree of the rock is effectively reduced after the using the gasket.Under the same gasket thickness and fixed distance between rock and PVC gasket protection effect is better than ABS gasket.With the increase of the gasket thickness of the two gaskets and the space between the rock and the gasket,the damage degree of the rock steadily decreases,and the increasing thickness of the gasket has a better protective impact on the rock than the increasing space between the rock and the gasket.The research results can provide a technical reference for direction fracture-controlled blasting.
directional fractureSplit Hopkinson Pressure Bar(SHPB)numerical simulationslotted cartridgesurrounding rock protection
万方数据
维普
