Filling reinforcement method for managing underground mined area of open-pit mine

Abstract

The invention relates to a filling reinforcement method for managing an underground mined area of an open-pit mine. The filling reinforcement method is characterized by including the following steps: determining filling drill holes according to the occurrence form of the underground mined area; inserting feeding pipes with trays into the drill holes, inserting grouting pipes in a manner of being spaced by one or multiple feeding pipes, injecting cement mortar, putting granular sand-gravel aggregate into the mined area through the feeding pipes until reaching a top plate of the mined area, and injecting cement mortar through the grouting pipes to form a concrete sandwiched wall in the granular sand-gravel aggregate; finally completing filling reinforcement construction of the whole mined area. The filling reinforcement method has the advantages that strength of a filling body is greatly improved when compared with that of dry filling of loose sand-gravel, deformation and movement of surrounding rock of the mined area can be limited effectively, and satisfactory filling reinforcement effect can be acquired. Compared with grouting cementation filling methods, the filling reinforcement method has the advantages that the defect that layered grouting has quite long construction period can be overcome, so that cost can be saved greatly, and construction efficiency can be improved substantially.

Description

technical field [0001] The invention belongs to the technical field of mining, in particular to a filling and reinforcing method for controlling underground goafs in open-pit mines. Background technique [0002] At present, the old goafs of open-pit mines are processed while detecting. The distribution of old goafs underground in open-pit mines is relatively complicated. It is ambiguous, and it is often impossible to predict the exact location where the subsidence may occur in advance. Therefore, with the mining of the open-pit mine, the subsidence of the old goaf in some sections will cause sudden safety accidents. [0003] Among the methods used to deal with old underground goafs, the filling method is a widely used method. According to the different types of filling materials in the goaf and the way of transportation, the filling of the goaf can be divided into three ways. [0004] Dry filling: dry filling uses loose materials as filling materials, that is, gobs are fil...

AI Technical Summary

Problems solved by technology

[0007] In order to ensure safety, personnel are strictly prohibited from entering the underground goaf of open-pit mines. Therefore, hydraulic filling is not suitable for filling and reinforcement. It is impossible to build a drainage system for dehydration and drainage of the filling body, and a large amount of water is harmful to the rock mass of the open-pit mine. The stability of the slope has certain adverse effects

The cost of dry filling is relatively low, but the loose filling body has relatively high compressibility and low initial compressive strength. The restriction and supporting force on the deformation of the overlying rock mass in the goaf are not ideal, and the surface often occurs Larger subsidence

Cemented filling can obtain higher filling body strength, and the degree of construction mechanization is also higher. The filling effect is ideal, but the filling cost is relatively high. very long

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