A dual-rise extracting method preventing and controlling rockburst

Abstract

A dual-rise extracting method preventing and controlling rockburst is provided. The method includes arranging a stope room in an ore body, simultaneously tunnelling at two sides of the stope room to obtain two cut rises, and extracting rich ore completely in one time; tunnelling the two cut rises and connection drifts in the upper part of the ore body to achieve a through effect; reserving positions for crown pillars, performing regressive type mining from top to bottom and from two sides to inside, and removing ore with a scraper mine winch; after extraction along the two cut rises, keeping sill pillars, and finishing recovery of residual ore in the stope room; and after ore mining is finished, arranging a next adjacent stope room along a transporting drift direction and performing miningwork of the next stope room according to abovementioned steps. Compared with traditional single-rise processes, the dual-rise (two cut rises) process adopts the two rises to bear breaking strength ofrock burst on stope room surrounding rock, stress on the original single rise is released in a multi-point manner, and rockburst caused by gusty buckling failure because the strength of stope room surrounding rock cannot bear centralized overhigh stress is reduced.

Description

technical field [0001] The invention relates to a mining method under the condition of special engineering geological structure, especially an underground mine with serious ground pressure, in order to ensure the safety of mining and improve the recovery rate. Background technique [0002] The room-and-pillar mining method has the characteristics of simple mining process, good ventilation, and low ore dilution rate. In the past two decades, due to the rapid development of tire-type and crawler-type rock drilling, loading, and handling equipment, it has reached a level near the level. For thicker ore deposits, the room-and-pillar method combined with trackless equipment can be used to realize large-scale mechanized mining, which greatly improves the production capacity of the mine, so it is widely used in underground mines at home and abroad. In the process of mining, the rock layer is in the original stress state before the mining of the ore seam, and the original balance st...

AI Technical Summary

Problems solved by technology

In the process of mining, the rock layer is in the original stress state before the mining of the ore seam, and the original balance state of the surrounding rock is destroyed after mining. Rockburst will occur when the brittleness and elasticity are high, especially as the mining depth continues to increase, the stress will increase, and the rockburst phenomenon is particularly severe. Workers exposed to the rockburst roof will have great production safety hazards. In addition, Rockburst often causes serious damage to the excavation face and equipment damage, which has become a worldwide problem in the field of underground engineering and rock mechanics

[0003] The traditional room-and-pillar mining method generally adopts the reserved mine wall method in areas with large buried depths and significant rockbursts. By controlling the exposed area of ​​the mine roof and reducing the stress of the surrounding rock, this method has a better effect in preventing rockbursts. But the disadvantage is that the recovery rate is too low, generally only 60%, which is a serious waste of resources

In terms of rockburst control, the existing prevention and control measures are mainly to strengthen the support and advance support of the surrounding rock, soften the rock with water, improve the rock properties, smooth blasting, etc. The advantage is that it can improve and alleviate the rockburst phenomenon to varying degrees. The disadvantage is that the construction process is complicated, the cost is high, and the output is affected.

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