Method for filling open pit

Abstract

The invention relates to a filling method of an open-air pit, which comprises the following steps: filling the bottom of the open-air pit to be filled with first tailing slurry, and curing to form a first cementation curing layer; a plurality of parallel strip-shaped dry heap bodies are constructed on the top face of the first cementation solidification layer with fine tailings as raw materials, gaps are reserved between the two ends of each strip-shaped dry heap body and the open-air pit slope, and then the gaps between the strip-shaped dry heap bodies and the gaps between the strip-shaped dry heap bodies and the open-air pit slope are filled with second tailings slurry; curing to form a frame type cementation body; the top face of the frame layer is filled with third tailing slurry, curing is conducted, and a second cementation curing layer is formed; and repeating the steps until the target level is filled. The frame type filling structure obtained through the filling method for the open pit is good in stability, the filling cost can be effectively reduced, the operation efficiency is high, and the good popularization significance is achieved.

Description

technical field [0001] The invention relates to a method for filling an open pit, which belongs to the field of mines. Background technique [0002] After the open-pit mining and production of the mine are closed, an open-pit with a certain area and depth is formed on the surface. On the one hand, the existence of open-pit damages the ecological environment of the mining area. On the other hand, it is easy to form a complex hydraulic channel with the underground mining system. Atmospheric precipitation invades the underground production system, causing great safety hazards to underground production. In addition, the high and steep slopes of open-pit pits are affected by weathering erosion and underground mining disturbances, which can easily induce slope landslides, threatening the stability of surface structures and underground production systems. The comprehensive restoration and utilization of mine land, especially the rational use of waste such as abandoned mine soil an...

AI Technical Summary

Problems solved by technology

However, from the currently published technical data, most of the tailings concentrated wet discharge, dry stack discharge or cemented filling methods are used. The above methods all have certain limitations: the tailings concentrated wet discharge is still fluid in essence, and for open pits For mines with poor engineering geological conditions at the bottom or hidden goafs, once the bottom becomes unstable and leaks, mudslides will form and cause serious disasters; dry stacking is especially not suitable for rainy areas in the south, where it has been soaked and softened by atmospheric precipitation for a long time. Deterioration will occur, and tailings water is easy to enter the groundwater system through water guide channels such as slope fissures, causing pollution; although tailings cemented filling can solve the above two problems, for large open pits, it will consume a lot of cement for a long time , resulting in an increase in production costs, and the cemented filling of the open pit generally shares a system with the underground filling, and the long-term cemented filling of the open pit will inevitably affect the normal mining and filling production of the underground

When the first filling slurry is solidified, the first filling layer is formed, which can cover the bottom of the open pit, thereby isolating the bottom of the open pit from the outside world and blocking the gap between the open pit and the underground mining system The hydraulic channel can prevent the atmospheric precipitation and filling slurry overflow water collected in the open pit from directly intruding into the underground mining system, which can reduce the impact on the underground mining system. However, this filling method consumes a large amount of cement and costs High, and in the rainy areas in the south, the cement slurry is easily affected by rainfall and is diluted and segregated in a large area. During the drainage process, the cementitious material is discharged with the accumulated water, resulting in the failure of the pile strength.

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