Trinity Gobside Gob-side Gob-side Rock Filling Mining Method

Abstract

The invention relates to a three-in-one gangue filling method, comprising a traditional gangue filling system and elastic airbags arranged at intervals, the elastic airbags can be quickly filled between the gangue filling body and the goaf roof, forming a roof connection as soon as possible, avoiding untimely top connection At the same time, the elastic airbags can also compress the gangue filling body to further reduce the residual subsidence of the gangue filling body; on this basis, a sand injection system is installed between the elastic airbags arranged at intervals , the sand injection system can reduce the amount of small particle size gangue used in the early stage of gangue filling, and solve the problem of dust raising in the dry filling method of gangue. At the same time, the fine sand injected in the later stage can fill the gaps between gangue particles, Reduces sinkage due to residual compression. In addition, the above-mentioned filling system relies on gob entry retention, which realizes pillar-free mining and greatly improves the recovery rate, and the gob entry retaining wall provides support for the filling system.

Description

technical field [0001] The invention belongs to the field of mine filling and mining, and in particular relates to a three-in-one mining method of gangue filling in gob-side entry retention. Background technique [0002] A large amount of gangue will be produced after coal mining, and a large amount of building solid waste will also be generated during building construction. Gangue and building solid waste are usually deposited on the ground in the form of accumulation, occupying a large area, polluting water sources, and generating Harmful gas, its treatment has always been a problem. [0003] The surface subsidence will occur after coal mining. When some important structures are pressed into the coal, the coal seam cannot be mined directly. Otherwise, the surface subsidence will destroy the ground structures. However, if the coal seam is not mined, a lot of natural resources will be wasted. , resulting in difficulty in mine replacement. In response to this problem, fillin...

AI Technical Summary

Problems solved by technology

[0002] A large amount of gangue will be produced after coal mining, and a large amount of building solid waste will also be generated during building construction. Gangue and building solid waste are usually stored on the ground in the form of accumulation, occupying a large area, polluting water sources, and generating Harmful gas, its treatment has always been a problem

[0003] The surface subsidence will occur after coal mining. When some important structures are pressed into the coal, the coal seam cannot be mined directly. Otherwise, the surface subsidence will destroy the ground structures. However, if the coal seam is not mined, a lot of natural resources will be wasted. , resulting in difficulties in mine replacement, in response to this problem, filling mining came into being, such as gangue filling mining is a commonly used filling mining technology in coal mines, and its filling materials mainly come from gangue and building solid waste

However, the disadvantage of gangue filling mining is that it is difficult to connect to the roof. There are always some remaining gaps between the gangue filling body and the goaf roof that cannot be filled, and the gangue is compressed in the later stage, which will cause the goaf roof to sink further, resulting in poor filling effect. ideal, which has hindered the massive promotion of waste rock filling mining

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