Deep hole blasting charging and detonating method for lowering foundation based on digital detonators

Abstract

The invention discloses a deep hole blasting charging and detonating method for lowering the foundation based on digital detonators. The method comprises steps of drilling; in-hole section division, including a lower charging section, a lower blocking section, an upper charging section and an orifice blocking section; charging in the sections; networking detonation and the like. During detonation,the detonation sequence and the time interval are strictly set through digital detonators. The method is advantaged in that in-hole segmented blasting is carried out, the blasting sequence and the time interval are strictly set through the digital detonators, rockfill generates relative dislocation in space after a front-row lower charging section is blasted, a free face is created for the bottomof a rear-row hole step, the clamping effect of front-row rock on the bottom of the step is reduced, and constraint conditions are changed; moreover, due to the blocking effect of the bottom blockingsection, explosion gas can be prevented from escaping too early, the action time of the explosion gas at the bottom of the hole is prolonged, explosion energy is fully utilized, the stress strength of a chassis resistance line part is improved, rock mass at the chassis part is fully crushed, generation of explosion roots is greatly reduced, and 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 deep hole blasting charging and initiation method based on a digital detonator for root reduction. Background technique [0002] Open-pit deep-hole blasting is widely used in water conservancy and hydropower, mines, tunnels, highways and other projects, and its proportion is increasing year by year. According to incomplete statistics, open-pit deep-hole blasting accounts for 90% of iron ore mining and 90% of chemical raw material mining. About 70%, and nearly 100% in construction material mining. Therefore, the quality of the blasting largely affects the progress and benefits of the project. Improving the quality of blasting is mainly to reduce the generation of large pieces and roots, reduce the unit consumption of explosives and the amount of secondary crushing. [0003] Due to improper selection of hole network parameters, unreasonable blasting seq...

AI Technical Summary

Problems solved by technology

Such as the patent CN105135962A, the charge structure of segmented charge and mixed charge is adopted in the blast hole at the same time, high-explosive explosives are loaded at the bottom, and ordinary explosives are loaded at the top. This method increases the blasting energy at the bottom of the hole To overcome the excessive resistance at the bottom of the steps, to achieve the purpose of reducing the foundation, but the use of high-explosive explosives will increase the construction cost, and will cause great damage to the rock mass retained at the bottom; another example is the patent CN109029170A, which uses a fan-shaped arrangement of blastholes to optimize The distribution of blasting energy of explosives is used to improve the blasting quality, but the fan-shaped arrangement of blastholes is more complicated, it is difficult to accurately control the lofting accuracy, and it is difficult to effectively overcome the clamping effect of the bottom plate, and the effect of reducing the blasting root is not significant; on the other hand, some patents have passed Improve blasting quality by improving blasting hole blocking technology, such as patent CN104374239A, set buffer air bag group in the hole blocking section to prevent blasting hole punching, increase the action time of blasting gas, but this blocking method is cumbersome to construct and complicated to operate; patent CN107687799A , patent CN208620912U, etc. have introduced some devices for reducing the blasting root. These devices may drill horizontally at the bottom of the hole to form cracks through special structures during blasting, so as to facilitate the blasting load to further break the rock mass at the bottom of the hole, or use a special energy-gathering device to make The blasting energy can be fully exerted, but the structure and size of these devices need to be specially made to meet the requirements, which is not universal and economical

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