In this paper, the blocking explosion-proof performance of emulsion explosive charged in casing tube was studied experimentally. The systematic analysis of the explosion-proof barrier effect was carried out under the conditions of different central tube, roughness and the thickness of emulsion explosives. The thicknesses of emulsion explosions under the conditions of different central tube materials were given. Critical thickness was less than 2.5mm when central tube was smooth solid steel rod; critical thickness was less than 3.0 mm when central tube was the wall thickness of 1. 0mm stainless steel pipe and the wall thickness of 0. 3mm stainless steel pipe filled with sodium bicarbonate; critical thickness was between 2.5mm and 4.0mm when central tube was rough stick; critical thickness was more than 4.0mm when central tube was the wall thickness of 0.3mm stainless steel pipe and smooth solid stick. The stronger strength of external constraints, the longer length of detonation propagation, detonation propagation length was 310. 0mm when it was placed on the steel plate and 270.0mm when it was hanging up.%文章研究了乳化炸药套管装药的阻隔防爆性能.通过改变套管中心管材质、粗糙度及药层厚度等参数,系统地分析了乳化炸药套管装药条件下的阻隔防爆效果,得到不同材质的中心管套管装药的临界药层厚度.光滑实心钢棒的临界药层厚度小于2.5mm；壁厚1.0mm的不锈钢管以及装满碳酸氢钠的壁厚0.3mm不锈钢管的临界药层厚度小于3.0mm;粗糙木棒的临界药层厚度介于2.5mm和4.0mm之间；而壁厚0.3mm的不锈钢管与光滑实心木棒的临界药层厚度大于4.0mm.外部约束强度越强,套管装药爆轰传播长度越长.置于钢板上时套管爆轰传播的长度为310.0mm,悬吊时爆轰长度为270.0mm.
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