A method for in-situ collapse and recovery of tall and large point columns

Abstract

The invention discloses a method for in-situ collapse and recovery of tall and large point columns. First, fill the goaf in two times, reserve empty head space when filling the time-space area for the first time, and build a filling retaining wall on the first filling body before the second filling to form a passage for personnel and equipment; filling After the body reaches the design strength, a roof cutting space is formed on the upper part of the point column, and the panel transportation roadway, the mining access road, and the cut patio are constructed in the floor rock mass, and then the parallel medium-deep holes are constructed around the cut patio in the roof cutting space. The blasthole, with the cut patio as the free surface, uses the millisecond differential to blast the ore in one or several times. When the ore is caving, a ore discharge funnel is formed at the bottom. The mining machine cooperates with the mining truck to discharge the mine. After the mining of the point column is completed, the goaf is closed or filled later. The method has high safety, low engineering construction difficulty, low cost, high recovery efficiency and high ore pillar recovery rate.

Description

technical field [0001] The invention relates to the technical field of underground metal mine mining, in particular to a method for in-situ collapse and recovery of tall and large point-and-pillar ore bodies in mines mined by a comprehensive method and a room-and-pillar method. Background technique [0002] The mines mined by the comprehensive method and the room-and-pillar method often leave a large number of point-and-pillar ore bodies to control the ground pressure and ensure the safety of the operation. Most point-and-pillar ore bodies have high grade and high economic value. It will result in a waste of resources. The point-column mining has great technical and economic difficulties. At present, the point-column mining technologies mainly include: column cutting method, drainage method, concrete pillar replacement method, full backfilling and subsequent mining method, mining pillar in the surrounding empty area of ​​bag filling body method, artificial artificial roadwa...

AI Technical Summary

Problems solved by technology

The recovery rate of mining pillars is low by using the pillar cutting method and the extraction method, and the personnel and equipment enter the empty area to work, which has poor safety and poor adaptability to the recovery of tall and large point pillars; the concrete pillar replacement method first needs to construct artificial concrete pillars, Then carry out mining of ore pillars, the construction efficiency of artificial concrete ore pillars is low, the cost is high, and personnel and equipment need to enter the goaf for operation; Filling, and then mining pillars, this method is safe to operate, but the construction cost of artificial false roads is high and the efficiency is low, and it is difficult and risky to construct artificial false roads in high and large empty areas

The above methods have been applied in practice, but there are problems such as high safety risk, low efficiency and high cost for the recovery of tall and large pillar ore bodies.

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