High Stress Induced Blasting Blasting Method in Deep Stope

Abstract

The invention discloses a high-stress induced blasting ore caving method for a deep stope. The method comprises steps as follows: 1), acquiring mineral and rock stress distribution of the deep stope and an evolution rule of the deep stope in an exploitation process; 2), taking an undercutting project as first-step stoping; 3), dividing a blasting stoping area; 4), calculating stress density values of the subareas obtained through dividing, and selecting a first mining subarea I for stoping on the premise of a feasible technology; 5), performing blasting parameter optimization on the selected first mining subarea I; 6), completing stoping of the first mining subarea I, namely, second-step stoping; 7), forming a new excavation area in the deep stope after stoping of the first mining subarea I, acquiring a stress field cloud picture II of the new excavation area again, performing area division on the stress field cloud picture II of the new excavation area, and then repeating the steps 4)-6) until the overall deep stope is mined. With the adoption of the method, the purposes of realizing safe and efficient production of the deep stope, improving the blasting effect, reducing the stoping cost and increasing the economic benefits of mine production are achieved.

Description

technical field [0001] The invention relates to the technical field of mining blasting, in particular to a high-stress-induced blasting ore collapse method in a deep stope. Background technique [0002] With the increase of people's demand for mineral resources and the continuous increase of mining intensity, the shallow mineral resources existing on the surface are increasingly consumed, and more and more underground mines at home and abroad have entered the stage of deep mining. One of the characteristics is high ground stress. Both excavation and mining are completed under high stress conditions, and the deep stope ore rock mass is in a relatively high ground stress environment. Relevant studies have shown that when blasting ore collapse is carried out in deep stopes, the damage of ore is the result of the joint action of static in-situ stress and super-dynamic stress produced by explosive explosion. The existence of high in-situ stress affects the crack initiation direct...

AI Technical Summary

Problems solved by technology

Therefore, this simple design and construction method of adjusting the parameters of the hole network and the amount of explosives cannot adapt to the complex and changeable characteristics of the high stress field of deep ore rocks, and lacks a theoretical basis, and the application effect in actual mine production is not good.

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