Control method of blasting block size for inert medium spacer charge at hole bottom

Abstract

The invention discloses a blasting fragmentation control method for hole-bottom inert medium spaced charging. According to the method, the explosive quantity of spaced inert medium explosives is worked out according to the lithology parameter of an explosion target and the technical parameter of the explosives, and the explosive pore diameter, the depth L and the ultra depth H are determined; the optimal spacing depth h of the spaced inert medium explosives is obtained through calculation according to the ultra depth H; and when air serves as inert media, h is equal to 0.7-0.8 H, and when water serves as the inert media, h is equal to 0.75-0.85 H. By setting the height parameter of the spaced inert media at the bottom of an explosive pore, the energy utilization rate of the explosives is improved, unit consumption of the explosives is reduced, the contact relationship between an explosive grain and the hole wall of a blasting hole is changed, initial pressure acting on the hole wall from impact waves and explosive gas products is reduced, the acting time of detonation gas is prolonged, and the fragmentation blasting effect is improved; and meanwhile, residual bedrock or destruction of bedrock is reduced, and the flatness of a bottom plate is improved.

Description

technical field [0001] The invention belongs to the technical field of engineering blasting, and in particular relates to a method for improving and controlling the blockiness of medium-fine-grained granite blasting. Background technique [0002] Bottom interval inert medium blasting technology is a blasting technology that has developed relatively rapidly in recent years. It is widely used in hard rock and complete rock mass granite stockyards. The blasting method of deep hole steps combined with air intervals or water intervals is often used, which can effectively improve Explosive unit consumption and improved blasting effect. In fact, in the 1970s, the former Soviet Union firstly carried out research on the interval blasting technology at the bottom of the blasthole. Subsequently, some other countries have also carried out the research and application of hole bottom interval blasting technology. They generally use water or air as the interval medium, and they can all re...

AI Technical Summary

Problems solved by technology

However, at present, this kind of scheme is limited to the experiential exploration of blasting practice, and lacks systematic theory for practical guidance. In addition, no control method for blasting fragmentation has been proposed, which has an extremely adverse impact on subsequent construction.

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