Method for controlling stability of high-stage stope filling body

Abstract

The invention discloses a method for controlling the stability of a high-stage stope filling body. The method comprises two stages, in the first stage, a stope to be mined is divided into a plurality of progressive layers from bottom to top, each progressive layer is divided into a plurality of mining units by designing the positions of blast holes, and only one or two mining units are subjected to charge blasting each time; after single progressive layered blasting is finished, a downward step surface extending from the boundary of the stope to the center is formed, and by controlling the ore removal amount of the bottom of the stope, the distance capable of limiting deformation and damage of a filling body is always reserved between a blasting ore heap and the original rock above; after mining of a single progressive layer is finished, the mining unit of the previous progressive layer is blasted, ore drawing is conducted on the bottom, and the distance between the blasted ore pile and the original rock above is kept unchanged until mining of all the progressive layers is finished; and in the second stage, ore drawing is performed at the bottom of the stope and corresponding waste rocks are supplemented at the top of the stope for several times until all ores are drawn and the stope is filled with the waste rocks, so that filling bodies of adjacent stopes on two sides of the stope are always kept stable.

Description

technical field [0001] The invention belongs to the field of mining, and in particular relates to a method for controlling the stability of filling bodies in high-stage stopes. Background technique [0002] For mines mined by the filling method, when the ore body is mined, the goaf is filled to limit the movement and deformation of the surrounding rock, reduce ground pressure activities, and ensure the safety of the next mining. The rock mass that is not naturally formed due to the filling body, that is, the filling body is not the original rock existing in the underground space, but a sandstone mixture formed after the artificially processed slurry is consolidated, its strength is lower than that of the original rock, and its mechanical properties are better than the original rock The rock difference and self-stabilization ability are smaller than the original rock, which is prone to problems such as instability and collapse. When the middle section of the mining is high, ...

AI Technical Summary

Problems solved by technology

When the middle section of the mining is high, the exposed area of ​​the stope at the high stage is large, and the stability of the stope filling body is more difficult to guarantee

Especially in the mining process of the two-step stope, the filling body in the first-step stope loses the side support, and the external conditions restricting its deformation are removed, and the filling body inevitably faces damage. , it will greatly increase the production cost and operation difficulty of various links such as blasting, mining, transportation, dressing and smelting, and may even induce safety accidents, directly threatening the safe production of mines.

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