Sublevel-open-stoping-method pressure-relief stoping method for high-dipping medium-thick ore body

Abstract

The invention belongs to the technical field of mining, and particularly relates to a sublevel-open-stoping-method pressure-relief stoping method for a high-dipping medium-thick ore body. The method achieves pressure-relief type stoping by means of the steps that a cut parvis is formed through blasting in groups, and then the ore body is divided into three subsections in the vertical direction of the ore body; the ore body is divided into a plurality of stopes in each subsection, and each stope is divided into I-VI rows of grouped concentrated blasting subareas to conduct blasting in groups; broken ores are formed after blasting is conducted, a route for transmitting hanging wall stress to heading wall through the ore body is cut off, and pressure-relief grooves in stair shapes are formed in the vertical direction of the ore body. In addition, through multi-group concentrated blasting, a hole-by-hole millisecond blasting detonation technology is adopted, disturbance and damage to rock mass caused by multi-group blasting of traditional operation are reduced, the blasting efficiency is enhanced, the stope room stoping period is shortened, and the ore production efficiency is enhanced.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to a method for pressure relief and back mining of a steeply inclined medium-thick ore body by segmental open field method. Background technique [0002] In the underground mining of metal mines, the stage transportation roadway is mainly used for ore transportation, while taking into account the requirements of ventilation and drainage, and is usually arranged in the footwall of the ore body. During mining in the lower and middle section, the stage transportation roadway in the upper and middle section is abandoned and no longer assumes the transportation function, and is only used as a temporary air return roadway in the lower and middle section. [0003] When the underground ore body is mined more than 300-400m, within the influence range of the inclined medium-thick ore body mining work, due to the gravity of the collapsed ore rock and the hanging wall pressure of the...

AI Technical Summary

Problems solved by technology

The traditional mining technology is to arrange the transportation roadway a little far away from the ore body to avoid the supporting pressure. The disadvantage is that the length of the roadway between the transportation roadway and the ore body increases The segmented rock drilling and segmented ore mining method used, each layer has a layered transport roadway and a connecting road, which will inevitably greatly increase the amount of mining work and related costs, and at the same time affect the efficiency of ore body recovery.

[0004] With the mining of ore body resources to the deep, the high stress environment in the underground ore body mining process will also affect the stability of the mining system roadway, and the layout of the traditional transportation roadway can no longer meet the engineering needs

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