Coal mine strip mining and coal pillar filling and replacement method

Abstract

The invention relates to a coal mine strip mining and coal pillar filling and replacement method, wherein the method includes first-stage mining of mining of a strip working face and filling of a strip goaf area, and second-stage mining of replacement of the strip coal pillar and filling of the strip coal pillar goaf area. With the method of strip mining and coal pillar replacement, the mine recovery rate can be greatly increased to 60%-70%, and the ground subsidence amount of the mining area is greatly reduced, and the stability of an aquifer structure is maintained, so as to achieve the purposes of water conservation and coal mining.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a coal mine strip mining and filling replacement method for coal pillars. Background technique [0002] Since the opening of townships and individual coal mines in my country in the 1980s, most small coal mines have adopted the traditional and backward "room-and-pillar" coal mining methods, including: stacking, digging, etc., which are safe Sex is totally insecure. In order to standardize coal mining methods in small coal mines, the State Administration of Work Safety issued "standards", "procedures" and "notices" many times, requiring the implementation of wall system coal mining methods with full negative pressure ventilation systems. In 2002, the Shaanxi Provincial Institute of Coal Science compiled the "Shaanxi Small Coal Mine Coal Mining Method Design Scheme", which played an important guiding role in standardizing coal mining methods and carrying out technical transform...

AI Technical Summary

Problems solved by technology

[0006] At present, the original small coal mines in Shaanxi Province have basically been transformed and upgraded into medium-sized mines. However, due to the limitations of resource reserves and well types, the coal mining methods of these mines have not been greatly improved, especially in northern Shaanxi, which is located in the "water conservation mining" area. In the local coal mines of Yulin City, the improvement of its coal mining methods is more urgent

Monitoring in recent years has shown that subsidence areas have formed on the surface of some pillar mining areas, indicating that the local coal pillars in the goaf have collapsed and become unstable, causing the overlying bedrock to break and communicate with the ground aquifer, resulting in a large amount of underground water inflow. The sharp increase has brought great harm to mine safety production and seriously damaged the local ecological environment.

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