Deep gentle dip narrow vein ore-pillar-free continuous exploitation method

Abstract

A deep gentle dip narrow vein ore-pillar-free continuous exploitation method comprises the steps that a zoning band in the ore direction in a segment at a certain span is adopted as an extraction unit, and continuous exploitation is carried out from one side to the other side; a V-shaped work face is formed on the upper portion of the zoning band, and dip pushing is carried out from top to bottom;after exploitation of certain space, a prestress expansion strut supporting top plate is erected, a filling curtain is constructed on the boundary of the zoning band, and the goaf is filled with milltailings or low-strength cemented filler; and a pressure sensor, an infrared displacement monitor and a ground pressure deformation data collector are mounted through prestress expansion struts, and ground pressure evolution and top plate sinking of the stope are monitored. The method has the advantages that no studding or original rock pillar is left in the stope, and core losses can be reduced;the ground pressure of the area stope can be effectively controlled and balanced, and the work safety conditions are improved; by means of the V-shaped work face, the ore carrying workloads can be reduced; and ground pressure disaster precise early warning can be achieved.

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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