A Closed Capping Method for Up-fill Mining

Abstract

The invention discloses a closed roof capping method for upward filling mining. The characteristic of this method is that after mining the last stratification, use a drilling rig to drill four exhaust holes at the four corners of the roof, and then build partition walls around the goaf to level off the bottom of the goaf and the roof. The partition walls around the goaf, the bottom of the goaf and the roof are pasted with waterproof materials to enclose the goaf into a closed filling space, and the filling material is injected into the closed filling space through the filling patio. When the filling material overflows, the exhaust When filling holes, stop injecting, and after the filling material fills the closed filling space, cover the four vent holes and the filling patio with a layer of waterproof material, and seal them with cement. The invention prevents the discharge of water in the filling slurry, maintains the volume and shape of the filling slurry, and forms a completely top-connected filling body after the filling material condenses, thus solving the problem of filling and top connection. The process of the invention is simple, safe, reliable, easy to implement and low in cost.

Description

technical field [0001] The invention belongs to the technical field of underground mining methods, in particular to an upward filling mining closed roof capping method. 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] The filling mining method belongs to the artificial support mining method. In the mine room or ore block, as the mining face advances, the filling material is sent to the goaf to manage the ground pressure, control the collapse of the surrounding rock and the movement of the ground surface, and protect the formed filling body down for recovery. This law is applicable to the mining of high-grade, scarce and valuable ore bodies with unstable surrounding rocks; the surface does not allow subsidence, and the mining conditions are complex, such as water bodies, railway trunk lines, ore bodies ...

AI Technical Summary

Problems solved by technology

However, in the practice of roofing, before the quick-setting of the slurry mixed with high-water materials 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 level of the slurry that originally filled the goaf will drop, resulting in the roofing No, the upper part of the filling body is easy to weather after solidification, and the filling effect is not ideal

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