Closed type capping method by upward filling mining

Abstract

The invention discloses a closed type capping method by upward filling mining. The method is characterized in that after stoping the last layer, four gas vent holes are drilled in four side corners of a roof by use of a drilling machine, and then, partition walls are built at the periphery of a mined-out area for processing the bottom of the mined-out area and the roof to be flat; waterproof materials are paved and pasted on the partition walls at the periphery of the mined-out area, the bottom of the mined-out area and the roof for enclosing the mined-out area into a closed type filling space; by virtue of a filling raise, a filling material is injected into the closed type filling space; when the filling material runs out of the gas vent holes, filling is stopped; and after the closed type filling space is filled up with the filling material, a layer of waterproof materials covers the four gas vent holes and the filling raise, and cement is used for sealing. The closed type capping method prevents water in filling slurry from discharging, and keeps the volume and the shape of the filling slurry; after the filling material is condensed, a completely roof-contacted filling body is formed, so that a filling roof-contact problem is solved. The closed type capping method is simple in process, safe and reliable, simple and easy to perform, and relatively 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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