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A method for maintaining the stability of false roof filling in a single approach downward and recovering the spacer

A technology for filling and stabilizing the approach, which is applied in the direction of filling, earth square drilling, underground mining, etc. It can solve the problems of unrecoverable ore body and large loss of ore volume, so as to simplify the construction process, improve the recovery rate and ensure recovery safe effect

Active Publication Date: 2021-08-17
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method mainly relies on the inter-columns on both sides to maintain the stability of the filling false roof of each layer in the stope, resulting in that the ore bodies in the inter-columns cannot be recovered and the ore loss is relatively large.

Method used

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  • A method for maintaining the stability of false roof filling in a single approach downward and recovering the spacer
  • A method for maintaining the stability of false roof filling in a single approach downward and recovering the spacer
  • A method for maintaining the stability of false roof filling in a single approach downward and recovering the spacer

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Embodiment 1

[0025] The invention relates to a method for maintaining the stability of filling a false roof in a single approach downward and recovering the intercolumn. The method can not only recover the intercolumn but also maintain the stability of filling the false roof in a single approach downward. That is to go back to the ore bodies in the two adjacent columns of the mining room first, and then drive super-long prestressed bolts with a certain row spacing into the surrounding rocks of the upper and lower walls in the vertical direction of the ore body in the inter-columns. By laying the reinforcement mesh in the inter-column, the exposed end of the long anchor rod is welded firmly with the reinforcement mesh. Then the layered intercolumn is cemented and filled. In this way, the filling body of the replacement column, the steel mesh, the super-long anchor rod and the filling false roof in the mine house can be formed as a whole, thereby ensuring that the filling body of the replace...

Embodiment 2

[0038] In order to further illustrate the beneficial effect of a method of maintaining the stability of filling the false roof in a single downward approach and recovering the studs, the actual mining of a gold mine is taken as an example to describe in detail.

[0039] According to the specific geological data and mining technical conditions of a gold mine, the ore body is 150-200m away from the surface, the average thickness is 5.0m, the average length of the stope ore body is 40m, and the total length of the columns on both sides of the adjacent stope is 15m (each 7.5m) , the height is 50m, the dip angle is about 75°, the average ore grade is 3.98g / t, and the ore body itself is extremely broken. The lithology of the ore is pyrite sericite, and the natural collapse phenomenon is serious; the surrounding rock of the ore body is sericized granite, the hanging wall of the ore body is extremely broken, the stability of the foot wall is average, and the thickness is more than 2m, ...

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Abstract

The invention discloses a method for maintaining the stability of filling a false roof in a single approach path and recovering a spacer column, and relates to the technical field of mining engineering. The steps include: first recovering the inter-columns on both sides of the mine house, and after the inter-column mining in the layer is completed, the vertical ore body trend immediately constructs super-long prestressed anchor rods on the surrounding rocks of the upper and lower walls, and its exposed ends are fixed by steel bar welding ; Then cement and fill in the inter-column goaf. After the filling body is stable, the ore body in the mining room is returned to the ore body in the mining room by adopting the layered and non-segmented roadway filling mining method of the downward approach. The filling bodies on both sides are constructed with super-long bolts, and the exposed ends of the super-long bolts are welded and fixed with the steel mesh in the mine house; finally, differential filling is carried out on the goaf of this layer. Repeat the above steps until all layers in the stope are finished. This method can not only recover the intercolumns on both sides of the stope, but also form an embedded beam structure for filling the false roof by replacing the filling body of the interposition columns, which improves the resource recovery rate and ensures the stability of the false roof.

Description

technical field [0001] The invention relates to the technical field of mining engineering, in particular to a method for maintaining the stability of filling a false roof in a single approach and recovering a spacer column. Background technique [0002] The downward approach layered filling mining method is suitable for mining extremely unstable ore bodies with high value, especially when the thickness of the ore body is less than 20m, the route is arranged along the strike; when the thickness of the ore body is greater than 20m , the approach is arranged vertically. In order to maintain the stability of the filling false roof overlying each layer in the stope without collapsing, it is necessary to lay reinforcement mesh in the filling false roof in advance, and drive extra-long anchors with a certain row spacing into the adjacent two columns pole. By welding the reinforcement mesh and the super-long bolt firmly, the overlying filling false roof is always in the embedded b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/22E21F15/00E21D20/02
CPCE21C41/22E21D20/02E21F15/00
Inventor 冯帆陈绍杰江宁臧传伟程力
Owner SHANDONG UNIV OF SCI & TECH