Mining method for treating goaf remaining intervening pillar by filling method

Abstract

The invention discloses a mining method for treating goaf remaining intervening pillars by a filling method. The method comprises the following steps of tunneling an ore removal roadway into an intervening pillar (16) on one side of a middle section transportation roadway (1) to reach an ore body hanging wall, and expanding the top of the ore removal roadway by adopting a fan-shaped medium-lengthhole to form a horn-mouth-shaped bottom structure; arranging a cut raise (12) and a pedestrian ventilation raise (3) in a intervening pillar hanging wall ore rock contact face and a footwall surrounding rock respectively, and enabling the cut raise (12) and the pedestrian ventilation raise (3) to communicate with the upper middle section air return roadway, and tunneling layered cross gateways (9)in the pedestrian ventilation raise (3) in the vertical direction at intervals of a certain height to reach the intervening pillar footwall boundary; and drilling upward parallel blast holes (11) layer by layer in circulating mode one by one from bottom to top, and performing the the operation links of explosive charging blasting, forced ventilation and caved ore discharging till the whole intervening pillars are completely mined; and completely discharging the caved ore (7) through a carry-scraper and filling the goaf. The recovery rate of the intervening pillar ore is increased, the ore dilution rate is reduced, and the working environment of a working surface is improved.

Description

technical field [0001] The invention belongs to the technical field of underground mine mining, and in particular relates to a method for mining inter-pillars in metal and non-metallic underground mines, and is particularly suitable for the mining of left inter-pillars in which empty areas are treated by filling methods on both sides. Background technique [0002] At present, many underground mines at home and abroad use the mining method of empty stop and fill to develop mineral resources. Whether it is the mining method of shallow hole retention and then filling or the method of segmented open stop and fill mining, the ore block is divided into mines and mines. The inter-columns are first returned to the mining room and filled, and then the inter-columns are recovered. This mining method is mainly applicable to: ①The ore and surrounding rock are stable, and will not fall naturally during the mining process; ②The thickness of the ore body should be thin or medium thick; ③Th...

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Problems solved by technology

[0005] (1) Only one mining tunnel is arranged for each layer, and the top is the covering layer formed by the collapsed surrounding rock. According to the "ore-drawing ellipsoid theory", when shoveling out the ore, due to the high layering, the When about 1 / 3 to 1 / 2 of the ore is released, waste rocks are mixed in until the released rocks are completely waste rocks, forcing the stop of ore drawing, resulting in permanent loss of ore

[0006] (2) Both sides of the intercolumn are filled with waste rocks. When the ore is shoveled out, the upper ore has not yet been fully released. The waste rocks on both sides will start to flow to the mine roadway under the action of its own weight, resulting in serious ore dilution. ;

[0007] (3) Every time shoveling out of the ore is carried out in a single-headed roadway, no penetrating air flow can be formed, the ventilation of the working face is difficult, and the operating safety conditions are poor;

[0008] (4) Each layer uses a fan-shaped medium-deep hole to drop ore and a scraper to remove the ore. It is necessary to move the rock drilling and scraper equipment back and forth, and it is necessary to dig a large number of equipment running channels, which greatly increases the amount of accurate cutting work.

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