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A method for filling false roofs without interstitial columns and maintaining the stability of downward single approach filling

An approach filling and stability technology, applied in the fields of filling, underground mining, earthwork drilling, etc., can solve the problems of large loss of ore volume and unrecoverable ore body, so as to reduce the loss of ore, simplify the construction process, reduce the Effect of Ore Loss

Active Publication Date: 2021-08-13
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 long anchor rods of the inter-columns to form the embedded beam structure of the filling false roof in the mine house, and then maintains the stability of the filling false roof in each layer of the mine house, which leads to The ore body cannot be recovered, and the amount of ore is lost

Method used

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  • A method for filling false roofs without interstitial columns and maintaining the stability of downward single approach filling
  • A method for filling false roofs without interstitial columns and maintaining the stability of downward single approach filling

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A method for maintaining the stability of a single downward filling false roof without interstitial columns, the specific steps include:

[0030] Step 1. When mining the inclined thin ore body with broken surrounding rocks, adopt the downward approach layering and non-segmented roadway filling mining method to return to the mining room. After the mining of a mining room in the layering is completed, the artificial field leveling is carried out immediately.

[0031] Before mining, ore chutes, chutes connecting roads, pedestrian ventilation patios, vein-piercing air ducts, vein-piercing transport lanes, cutting drifts and ore loading approaches are all arranged in the footwall of the ore body. The pedestrian ventilation raised shaft is arranged at a distance of 2m from the contact zone of the central footwall of the ore body, and the ore chute and the chute connection road are excavated near the center of the footwall near the ore body; the mining work is carried out from ...

Embodiment 2

[0043] On the basis of Example 1, in order to further illustrate the beneficial effect of a method for filling false roofs without interstitial columns and maintaining the stability of filling a single approach, the actual mining of a gold mine is taken as an example to describe in detail.

[0044] According to geological data and mining technical conditions, the ore body is 150-200m away from the surface, with an average thickness of 5.0m, the average length of the mine house in the stope is 40m, the average length of the mine room column in the adjacent stope is 15m, the height is 50m, and the inclination 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 th...

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Abstract

The invention provides a method for maintaining the stability of filling a false roof in a single approach downwards without interstitial columns, and relates to the technical field of mining engineering. The steps include: returning to the mining room by adopting the mining method of layering and non-segmented roadway filling in the downward direction, and performing artificial leveling immediately after the layering of the mining room. Construction of ultra-long prestressed bolts on the surrounding rocks of the upper and lower walls perpendicular to the ore body trend is supported by means of anchor-net-spray. The exposed end of the anchor near the bottom plate is fixed by steel bar welding, and the crushed ore cushion and isolation layer are laid. The longitudinal bars of the steel mesh are hung on the steel bar hooks reserved in the previous layer, and their lower ends are welded to the horizontal steel bars at the bottom of the layer. The goaf is cemented and filled, and after the filling body is stabilized, the lower layer is mined until all layered mining is completed. Repeat the above steps until all mines are mined. This method maintains the stability of the filling false roof with the help of super-long bolts in the surrounding rock of the upper and lower walls and the warp and weft steel mesh in the goaf, and does not need to leave spacers, reducing the loss of ore.

Description

technical field [0001] The invention relates to the technical field of mining engineering, in particular to a stability method for filling a false roof into a single approach under the condition of no interstitial 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 bea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/22E21D11/15E21D11/10E21D20/00E21F15/00
CPCE21C41/22E21D11/10E21D11/152E21D20/00E21F15/00
Inventor 陈绍杰冯帆尹大伟程力刘奇
Owner SHANDONG UNIV OF SCI & TECH
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