Full-section flexible dewatering method for subsequent backfilling of hollow field in metal mine

Abstract

The invention discloses a full-section flexible dewatering method for subsequent backfilling of a hollow field in a metal mine. A full-section dewatering pipe with appropriate length is selected according to the height of the hollow field, descends to the bottom of the hollow field from the upper portion of the hollow field and is fixed to a baffling wall at the bottom of the hollow field, and theupper portion of the full-section dewatering pipe is fixed to an anchor rod. The full-section dewatering pipe structurally includes a framework, and the exterior of the framework is sequentially wrapped with a water-permeable layer, a filtering layer and a coating layer. The framework is a spring steel wire ring which is subjected to anti-corrosion treatment and coated with a protective layer. The filtering layer adopts a permeable geotextile, and the coating layer adopts a polymer fibrous braid. According to the dewatering pipe, the dewatering efficiency can be effectively improved, the mudcontent is reduced, the filling operation cycle time is shortened, and the labor load of workers is reduced. At the same time, the filling slurry concentration can also be increased, correspondingly the filling body strength is improved, and the safety of backstoping of surrounding stopes is ensured.

Description

technical field [0001] The invention relates to a full-section flexible dehydration method for subsequent filling of an empty space under a metal mine. Background technique [0002] The traditional open-pit mining method forms a large number of goafs, leading to disasters such as surface subsidence, mountain cracking or collapse, and stope collapse. With the continuous improvement of the country's mining safety and environmental protection requirements, the mining method of emptying and filling metal mines has been more and more widely used. Metal ore stope filling refers to mixing one or more filling aggregates such as tailings or other aggregates, cementitious materials, water, etc. in a stirring device, and uniformly stirring to form a filling slurry, which is transported by gravity or Pumped to the downhole to be filled stope. Since the filling slurry contains a large amount of water, if it is not discharged in time, it will not only make the filling retaining wall bea...

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Problems solved by technology

[0005] 1) The construction process is complicated, not only manual drilling is required, but also additional wrapping of geotechnical filter cloth is required, and the labor intensity is high;

[0006] 2) The water passing area is small and the dehydration efficiency is low. Since the bellows can only secrete water when the water in the stope reaches the corresponding height of the drill hole, it not only slows down the cycle speed of the stope filling operation, but also The stored water directly affects the hydration reaction and strength growth of the cemented filling body;

[0007] 3) Dehydration has a large amount of mud. Use a hand drill to drill holes on the bellows. The pore size is generally 5-10mm. The pore size of the geotechnical filter cloth wrapped outside is relatively large, and more muddy particles will be discharged, resulting in a large amount of gelation. The material seeps out with it, and the efflux of the cementitious material will inevitably cause the strength of the cemented filling body to decrease

[0008] 4) When the height of the stope is large, there are many corrugated pipes that need to be connected, which are heavy and hard, and are easy to break at the joints and turns, resulting in the loss of filling slurry or blocking the dehydration pipe, resulting in the failure of dehydration in the stope

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