Safe and efficient mining method for segmented medium-length hole stope

Abstract

The invention provides a safe and efficient mining method for a segmented medium-length hole stope. The method comprises the steps that an ore body to be mined is divided into segmented stopes and mined step by step, when a hanging roof occurs in the mining process, medium-length hole blast holes are constructed in rock drilling roadways of the left and right adjacent stopes to the hanging roof area for millisecond blasting treatment, continuous deterioration of the normal row face blasting hanging roof condition is avoided, and smooth proceeding of medium-length hole stope mining operation is guaranteed. The medium-length hole blast hole charging part is the range with the hanging roof in the medium-length hole stope in one step, the charging method can achieve efficient and accurate blasting of the hanging roof, waste of explosives cannot be caused, and the stability of the ore body and surrounding rock mass in the adjacent stopes is not affected. According to the method, timely treatment can be carried out when the hanging roof occurs in the segmented medium-length hole stope, the method has the advantages of being accurate in blasting, high in construction efficiency and low in cost, the ore loss rate can be effectively reduced, the ore crushing quality can be improved, and a guarantee is provided for efficient and safe operation of subsequent normal row face blasting engineering of the stope.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a safe and efficient mining method for sectioned medium and deep hole stopes. Background technique [0002] In the mining project, when the stope is subjected to normal surface blasting, as the mining progresses, the top of the stope will be affected by factors such as the construction length of the medium and deep hole blastholes and insufficient charge density, resulting in a suspended roof in the stope. An arched shape is formed at the top of the stope. If there is a suspended roof in the mining blasting, it will cause insufficient blasting compensation space and cannot provide the free surface required for the mining blasting, resulting in insufficient subsequent mining blasting height, which will affect the normal production of the mine stope. Suspended roof blasting can usually account for 10-20% of the total blasting volume. If it is not dealt with in time, the suspended r...

AI Technical Summary

Problems solved by technology

But this patent can only be applied under the condition that the normal row surface has the construction treatment of the suspended roof blast hole. If the normal row surface of the suspended roof can no longer construct the blast hole, then this method cannot normally blast the suspended roof; and the rear row is deep Hole blasting to deal with the suspended roof, because the blasting position is not accurate, it may not achieve the purpose of effectively collapsing the suspended roof

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