Three-in-one gob-side entry retaining gangue filling mining method

Abstract

The invention relates to a three-in-one gangue filling method. A traditional gangue filling system and elastic air bags arranged at intervals are included; the elastic air bags can be rapidly filled between a gangue filling body and a goaf roof; roof contact is formed as soon as possible, and roof and ground surface sinking caused by untimely roof contact is avoided; meanwhile, the elastic air bags can also generate a compression effect on the gangue filling body, so that residual sinking of the gangue filling body is further reduced; and on the basis, a sand injection system is arranged between the elastic air bags arranged at intervals, the sand injection system can reduce the use amount of small-particle-size gangue during early-stage gangue filling, the problem that dust is raised in a dry gangue filling method is solved, meanwhile, gaps between gangue particles can be filled with fine sand injected in the later stage, and sinking caused by residual compression is reduced. Besides, the filling system depends on gob-side entry retaining, coal-pillar-free mining is achieved through the gob-side entry retaining, the recovery rate is greatly increased, and a retaining wall of the gob-side entry retaining 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...

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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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