A kind of deep gently inclined thin ore vein continuous mining method without ore pillar

Abstract

A method for continuous mining of deep gently inclined thin ore veins without ore pillars, the steps of which include: taking a partition strip with a certain span as a mining unit along the ore body within a stage, and continuously mining from one side to the other; The upper part forms a "V"-shaped working face, which advances along the slope from top to bottom; after a certain space is mined, prestressed expansion pillars are erected to support the roof, and filling curtains are built at the boundaries of partition strips, and tailings or low-strength cemented filling bodies are used to fill the mining area. A composite support body is formed in the empty area; pressure sensors, infrared displacement monitors and ground pressure deformation data collectors are installed by using prestressed expansion pillars to monitor the evolution of stope ground pressure and roof subsidence. The advantages of this method are: there are no space pillars and original rock pillars between the stopes, which can reduce the loss of ore; it can effectively control and balance the regional stope pressure and improve the operating safety conditions; the adoption of "V" shaped working face can reduce ore transportation workload; it can realize accurate early warning of ground pressure disasters.

Description

technical field [0001] The invention belongs to the technical field of mining engineering, in particular to a novel mining method for continuous mining of deep gently inclined thin veins without ore pillars. Background technique [0002] Gently inclined thin veins account for a very large proportion of the reserves of precious and non-ferrous metal mineral resources. Due to the constraints of ore body occurrence conditions, mines are mainly mined by the room-and-pillar method. This type of mining method mainly ensures the stability of the stope roof through ore intercolumns and stope ore point columns. After entering deep mining, in order to maintain the stability of the stope, it is necessary to reduce the span of the stope and increase the number of ore point columns left. Under high stress conditions, the stress concentration of the original rock ore pillars in the stope is prominent, and brittle failure and even rockburst occur easily, which seriously endangers the safe...

AI Technical Summary

Problems solved by technology

There are two defects in this method: ① Hydraulic props are used as temporary support equipment. Although the safety conditions of the stope during the mining operation period are ensured, the recovery operation is dangerous. At the same time, only tailings filling bodies are used in the final empty area to maintain the stope ground pressure , due to the poor roof connection effect of the filling body, the stope ground pressure cannot be effectively controlled, resulting in stress concentration in the adjacent stope and affecting normal production, especially after the multi-stope mining is completed, the regional ground pressure control effect is poor, and even large-scale roof settlement is caused Collapse; ② There are ore columns between the ore blocks, which leads to an increase in the loss rate of ore and affects the economic benefits of the enterprise

There are three defects in this method: ① The ore point columns used to control the stope pressure and the ore inter-columns left between the panels are permanent losses, and the ore recovery rate is low; When reaching the upper area of ​​the panel, the surrounding rock is prone to generate high stress and the ground pressure will appear, threatening the safety of the operators; ③The inclined working face in the mining area can only reduce the climbing angle of trackless equipment such as rock drilling rigs and scrapers. The actual caving ore is in a scattered state in the stope instead of being concentrated. Using a trackless scraper to enter the stope to carry out mining operations on the scattered ore is labor-intensive and time-consuming, and the transportation efficiency of the caving ore is low.

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