An adjustable gob-side entry retaining wall and its construction method for active support and then pressure support

Abstract

The invention discloses an adjustable gob-side entry retaining wall with initial active and later buffering support and an implementing method thereof. The adjustable gob-side entry retaining wall with initial active and later buffering support and the implementing method thereof are mainly accomplished through the mode of completing prefabricating of components above a well and conducting masonry construction in a lane. Wall components mainly comprise a bedding block of a U-shaped structure, a lifting support block of a T-shaped structure, a friction crush block of a triangular structure, and a contractible crush block. The gob-side entry retaining wall has the advantages of being simple and reasonable in structure, good in supporting effect, adjustable in wall height, convenient to adjust, and strong in a adaptability; the main components used by the wall are all prefabricated above the well, intensity is guaranteed and quality is reliable. The implementing method is simple and convenient in operation, and a single hydraulic prop can be relied on to achieve wall position adjustment and active support can be provided by the single hydraulic prop to help cut off a lane gob side top plate; the wall is contractible so that pressure buffering function can be achieved; the accomplished gob-side entry retaining wall with initial active and later buffering support can adapt to the pressure change law of the gob-side entry retaining top plate.

Description

technical field [0001] The invention relates to a gob-side entry retaining wall and a construction method thereof, in particular to an adjustable gob-side entry retaining wall and a construction method thereof, and belongs to the technical field of mine support. Background technique [0002] Coal pillarless mining is an advanced mining technology, which is conducive to improving the recovery rate of coal, and can also eliminate or reduce disasters caused by coal pillars. It has been widely used in recent years. [0003] Gobside entry retention is an important development direction of pillarless mining. Due to the existence of roadside retention along the goaf, the coal pillars for maintaining the roadway can be canceled, the recovery rate of coal resources can be improved, the coal resources can be fully utilized and rationally developed, the service life of the mine can be extended, and it is beneficial to the sustainable development of the mine; The amount of excavation r...

AI Technical Summary

Problems solved by technology

In the prior art, this is a very advanced method of retaining gob-side entry, but objectively, this method also has very obvious deficiencies. The width of the roadway is about 5m. Under the influence of the advanced bearing pressure in front of the working face, the roof of the roadway will often sink greatly. This sinking will make the shape of the roof of the roadway a downward curved arc surface. That is to say, in the vertical direction, there is a large height difference between the heights of the roof of the roadway. On the other hand, there are many anchor rods exposed on the roof of the roadway, which will cause the prefabricated wall to move sideways towards the working face. It is very difficult or even impossible to move

If the height of the wall is reduced and the method of relying more on soft media to connect the roof to meet the lateral movement of the wall to the direction of the working surface, the phenomenon of reduced wall support effect cannot be avoided, that is, the expected initiative cannot be achieved. The role of support

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