A method for subsequent filling of closed open field mining

Abstract

The invention discloses a method for filling after closed open space mining. The method is characterized by excavating a filling patio on the roof, using a drilling rig to drill four exhaust holes at the four corners of the roof, building partition walls around the goaf, and leveling the bottom and roof. Pave waterproof materials on the partition wall, bottom plate and top plate, and form a closed filling space surrounded by the partition wall, bottom plate and top plate. Fill the filling material into the closed filling space through the filling patio. When the filling material overflows the vent hole, stop the injection and start filling. After the material fills the closed filling space, the four vent holes and the filling patio are covered with a layer of waterproof material and sealed with cement. The invention maintains the volume and shape of the filling slurry, and forms a completely top-connected filling body after the filling material is solidified, thus solving the problem of filling and top-connection.

Description

technical field [0001] The invention belongs to the technical field of mining underground metal mines, and in particular relates to a method for filling after closed open pit mining. Background technique [0002] Underground mining methods are divided into three categories according to the method of ground pressure maintenance: open-field mining method, filling method and caving mining method. [0003] At present, the open-pit mining method is widely used. During the mining process, the open-pit mining method divides the ore block into a mine room and an ore pillar. The first step is to mine the mine room, and the second step is to mine the pillar. When returning to the mining room, the goaf of the stope exists in the form of an open space, and is maintained by the stability of the ore pillar and the surrounding rock itself. After the mine is mined, it is necessary to return to the mining pillar and deal with the goaf in time. The filling method is generally used to deal w...

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Problems solved by technology

For example: "Nonferrous Metals (Mine Parts)" 1996 Issue 06 "Three-in-one" filling and high-water-cured materials for roofing after VCR method stope" paper, a large number of "three-in-one" filling is used in gobs at one time And use high-water curing quick-setting material for final roofing, but in the final roofing practice, before the quick-setting of the slurry mixed with high-water material and water, a large amount of free water and the slurry attached to the free water will be directly discharged due to infiltration, and the original filling The level of the slurry in the mined-out area drops, so that the roof cannot be connected, and the upper part of the filling body is easily weathered after solidification, and the filling effect is not ideal

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