Field tests in a region of the plateau were carried out to study the"poly device+emulsion explosives"in tunnel surface blasting and to achieve the feasibility of peripheral hole air spacing charge and poly device on the explosives detonation distance.A seamless steel tube was used to simulate the tunnel peripheral hole for two or more sections of"emulsion explosives+poly device"detonation.A martyrdom test was implemented with # 2 rock emul-sion explosives.The maximum stable detonation and martyrdom distance were obtained through several groups of ex-periments.The test results show that the maximum stable detonation and martyrdom distance 15 cm length of poly-merized explosives and # 2 rock emulsion explosives are respectively 230 cm and 115 cm in the seamless steel tube.The maximum stable detonation distance of multi-section polymerized explosives can reach 80 cm.Due to the radial constraints on the detonation wave of the polymerization device,the front end of the conical metal drug mask explo-sion formed by the polymerization of energy jets significantly increases the axial and upward shockwave energy,which makes it possible to increase the energy of the shockwave.The emulsion explosives in seamless steel pipe detonation distance increased significantly upward shock wave energy,which can be applied to the tunnel perimeter hole,repla-cing the detonating cord to achieve air spacing charge and enhance the effect of surface blasting,cost savings,and time savings.
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