Fore-poling and ground pressure unloading mining method

Abstract

The invention discloses a fore-poling and ground pressure unloading mining method. The fore-poling and ground pressure unloading mining method comprises the following steps: constructing a stope linking path towards an ore body lower disc on a segmented lane on the perpendicular uppermost part on the center position of a stope, and separately constructing a stope room and an ore column cutting lane to an ore body upper disc along a perpendicular ore body in the stope after reaching the boundary of the ore body lower disc; utilizing the cutting lane to cut off a stress propagation way to release stress, and performing partial ground pressure unloading on a disc region ore room and the ore column stope; in the ore column cutting lane which corresponds to the uppermost segmented lane, constructing an upper fan-shaped long anchor cable and a lower fan-shaped long anchor cable in sequence for fore-poling; and in the cutting lane with a constructed ore column front layer, constructing the upper fan-shaped long anchor cable for fore-poling. The fore-poling and ground pressure unloading mining method realizes quick excavation under a bad geological condition of a mine deep part, adopts pre-unloading measures while performing extraction for a thick ore body through a mechanical disc region, reduces ground stress of the disc region ore room and the ore column stope, adopts fan-shaped long anchor cable fore-poling for the ore column stope affected by concentrated stress, and ensures mining safety of the disc region ore column.

Description

technical field [0001] The invention belongs to the technical field of mining, and relates to a mining method for advance support and ground pressure unloading. This method is mainly applicable to the layer-by-layer filling mining method in the deep part of the mine where the water is rich, the surrounding rock is broken, the stope site pressure is high, and the mechanized panel mining is thick and large. The thick ore body, the horizontal thickness of the ore body is generally more than 25m; the water-rich and broken surrounding rock means that after the roadway is excavated in the rock mass, the water gushing in the working face reaches 40m 3 / h or more, and the surrounding rock is categorized by RQD as Class IV and V rock masses with poor stability. After exposure, due to the short self-stabilization time, it is very easy to collapse and caving. Background technique [0002] When mining thick and large ore bodies in the deep part of the mine, the mechanized panel upward ...

AI Technical Summary

Problems solved by technology

When the panel mining method is adopted in the deep part, due to the significant increase of the ground stress, the damage to the panel mine house or the roof of the mine pillar will be aggravated, forming a large safety hazard

Especially when mining pillars in the panel area, due to the influence of stress concentration, coupled with the impact of mining on the blasting impact of the cemented filling body on both sides, the stress damage of the roof of the pillar is increased, forming a large safety hazard

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