A method for continuous recovery of residual top and bottom pillars using large sections

Abstract

The invention discloses a mining method adopting a large cross-section to continuously recover the residual top and bottom pillars in the stope. Based on thin plate theory and advanced support theory, this method designs the stope structure parameters of the recovery of the top and bottom pillars under the cemented filling body, and forms a complete mining process, which solves the problem of low mining capacity of the traditional approach type small section and layered type. The disadvantage of poor mining security. The present invention advances the cemented filling body on the top of the protective roof through super-strength grouting and advanced bolts to form a high-strength reinforced false roof, avoids leaving an overly thick ore roof, and improves recovery rate while fully Guaranteed the safety of mining. The invention includes stope layout, stope structural parameter design, reinforced false roof design, reinforced false roof construction technology, mining and cutting, mining, filling and other processes. The invention has the characteristics of large production capacity, high recovery rate, good safety and the like.

Description

technical field [0001] The invention belongs to the technical field of underground mine mining, and in particular relates to a method for continuously recovering residual top and bottom pillars with large sections. Background technique [0002] In recent years, the country has paid more and more attention to environmental protection, and the filling mining method has been widely used in metal mines in my country. However, with the depletion of mineral resources, mining the top and bottom pillars under the filling body has become a problem that many mines need to consider. The top and bottom pillars are an important part of the mine's mineral resources, accounting for 10%-20% of the total mine resources. However, due to the limitation of the technical level in the early stage of mining, a large number of top and bottom pillars cannot be effectively recovered, resulting in a large amount of resources being shelved. [0003] In recent years, the research on the mining method of...

AI Technical Summary

Problems solved by technology

The top and bottom pillars are an important part of the mine's mineral resources, accounting for 10%-20% of the total mine resources. However, due to the limitation of the technical level in the early stage of mining, a large number of top and bottom pillars cannot be effectively recovered, resulting in a large amount of resources being shelved

[0003] In recent years, the research on the recovery method of the remaining top and bottom pillars in the stope has been paid more and more attention, and many research results have been proposed. Among them, the most used schemes are: 1. layered filling method, 2. strip filling method, 3. approach method Filling methods, etc.; among them, the entry-type filling method and the strip-type filling method have been widely used in recent years because of their small-section mining safety, but their construction is difficult, the cycle is long, and the mining cost is high. Its development; the layered filling method increases the recovery area to a certain extent and increases the production capacity, but due to the influence of the exposed area of ​​the roof, its safety is poor and the recovery rate is low; the recovery of the top and bottom pillars under the filling body belongs to complex environments. Therefore, in order to ensure sufficient safety in many mining schemes today, it is inevitable to use small sections for mining, and it is necessary to retain a thicker roof during the mining process, which has caused a certain waste of resources

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