Sub-level shrinkage caving method

Abstract

The invention relates to a sub-level shrinkage caving method. According to the sub-level shrinkage caving method, no large-area mined-out space appears in an extraction process, a hanging wall rock is supported by utilizing a caved ore in the early stage of extraction, and an upper overburden rock downwards moves to fill a mined-out space to control ground pressure along with bottom ore removal in the later stage of the extraction, so that safe and high-efficiency extraction is achieved; ores are aggregated in a bottom trench in a bottom structure, and the bottom trench is connected with a travelling roadway by adopting a herringbone non-track ore loading feed path, so that the sub-level ore removal is realized; when undercutting work is carried out, only a part of caved ores are discharged, fragmented rock mass in an ore block keeps that the hanging wall rock is not collapsed and ensures that a sufficient free compensating space is enough for upper ore dropping, the dropped ore is discharged from the non-track ore loading feed path, and then is put into a mine car to leave from a stope, then ore dropping is carried out again, the process is circulated till the ores contained in the ore block all drop in a blasting way, and finally large-scale ore removal is carried out; and the overburden rock continuously moves downwards to fill a mining area to control the ground pressure along with the continuous extraction of the ores during the large-scale ore removal.

Description

technical field [0001] The invention belongs to the technical field of underground mine mining, and in particular relates to a caving mining method with staged ore retention. Background technique [0002] Due to the complex and diverse occurrence conditions of ore deposits and the changeable properties of ores and surrounding rocks, a wide variety of mining methods have been used in production practice. According to the ground pressure management method during mining, the mining methods are divided into three categories: open-pit mining method, filling mining method and caving mining method. [0003] The open-pit mining method forms a large goaf when returning to the mining room, and uses the strength of the ore pillar and the ore rock itself to maintain the stability of the ore rock. Personnel operations are often carried out in an open field with a large exposed area. When encountering ore rocks with poor stability, the open field mining method will not be an option. [...

AI Technical Summary

Problems solved by technology

[0006] In the practice of underground mining of ore deposits, when encountering broken and extremely unstable ore rocks, roadway construction is very difficult and the construction cost is high

Due to the large amount of mining work and the large exposed area of ​​surrounding rocks in the existing mining methods, many potential safety hazards are caused, the cost is increased, and the efficiency is low.

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