Studding-free method of maintaining stability of filled mat of downward single access

A technology for filling and stabilizing the approach, which is applied in the direction of filling, underground chambers, earthwork drilling, etc., can solve the problems of unrecoverable ore body and large loss of ore volume, so as to simplify the construction process, reduce the loss of ore, The effect of safe and efficient recovery

Active Publication Date: 2020-07-28
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 t

Method used

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  • Studding-free method of maintaining stability of filled mat of downward single access
  • Studding-free method of maintaining stability of filled mat of downward single access

Examples

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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 studding-free method of maintaining stability of a filled mat of a downward single access and relates to the technical field of mining engineering. The method comprises the following steps of recovering a stope room by using a downward access layered segment-free roadway filling mining method and carrying out manual flat fielding immediately after layering the recovered stope room; constructing an ultra-long pre-stressed anchor rod to surrounding rocks of upper and lower discs vertical to an ore body and carrying out supporting in an anchoring-screening-spraying way; welding and fixing an exposed end of the anchor rod close to a bottom plate, and paving a crushed ore cushion and an isolating layer; suspending a longitudinal bar of a bar-mat reinforcement to a reinforcing steel bar hook reserved in a previous branched layer and welding the lower end of the longitudinal bar to a horizontal reinforcing steel bar at the bottom of the branched layer; carrying out cemented filling to a goaf, and recovering a lower branched layer after a filling body is stabilized till recovering all the branched layers; and repeating the steps till recovering all stope rooms. Themethod maintains the stability of the filled mat by means of the ultra-long anchor rod in the surrounding rocks of the upper and lower discs and the longitude and latitude bar-mat reinforcement in the goaf and studdings are not reserved, so that the loss of ores is reduced.

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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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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