Room-and-pillar major-diameter longhole inverted-step-like segmented lateral caving subsequent filling mining method

Abstract

The invention discloses a room-and-pillar major-diameter longhole inverted-step-like segmented lateral caving subsequent filling mining method for a steeply-inclined medium-thick orebody and gently-inclined and inclined extremely-thick orebodies with steady surrounding rocks at upper and lower panels. The method is characterized in that: an orebody is divided into panels, then the panels are divided into continuous single-stage stoping units, and mining is carried out by using a stoping sequence of stoping one unit every other unit, i.e., mining a room at first and a pillar next; when mining a room, a V-shaped trench bottom structure is employed, a longhole drilling chamber is arranged at the upper part of stope, bar-shaped pillars are left to support the top plate of the chamber, a down-the-hole drill is used for drilling rocks, an explosion mode of light section VCR method underholing inverted-step-like lateral caving with a common emulsion explosive is employed, access roads towards the room for ore removal are arranged in the pillars, and cemented roof-contact filling is employed; and during stoping of the pillars, access roads for ore removal are dug towards the pillars in cemented bodies in the room, a stoping manner for the pillars is identical to that for the room, and non-cemented filling with tailings and waste is employed. The method provided by the invention has the advantages of high security, a low production cutting ratio, great production capacity, low operation cost and small loss and dilution of resources.

Description

technical field [0001] The invention belongs to the technical field of mining, and relates to a room-and-pillar type large-diameter deep hole inverted step-shaped segmented lateral collapse and subsequent filling mining method. ~ Inclined extremely thick large ore body. technical background [0002] At present, most of the large orebodies with steep incline above medium thickness and gently incline to extremely thick are mined by segmented open-stop and then-fill method or the traditional "VCR" method. The mining method of sectional emptying and subsequent filling requires the excavation of multiple sectional transport level roadways, rock-drilling horizontal roadways, and cutting patios. The mine wall of the pillar is uneven and the integrity is damaged, which deteriorates the mining conditions of the pillar. At the same time, the use of fan-shaped holes usually increases the large block rate, which increases the workload of the secondary blasting in the stope and reduces ...

AI Technical Summary

Problems solved by technology

The mining method of sectional emptying and subsequent filling requires the excavation of multiple sectional transport level roadways, rock-drilling horizontal roadways, and cutting patios. The mine wall of the pillar is uneven and the integrity is damaged, which leads to the deterioration of the mining conditions of the pillar. At the same time, the use of fan-shaped holes usually increases the rate of large blocks, which increases the workload of secondary blasting in the stope and reduces the ore extraction efficiency; the traditional "VCR "method has defects such as too many charge holes for each blasting, too large stope exposed area, unbalanced mining and charging, etc.

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