Obligate cavity channel gob-side entry retaining wall filling method

Abstract

An obligate cavity channel gob-side entry retaining wall filling method is characterized in that a cylinder hole is obligated on a formwork, a thin-wall steel cylinder penetrates through the formwork, a lane is located on the high position, a goaf area us located on the low position, a filling wall with a cavity is formed after filling, wall using materials are reduced, and wall strength is not influenced. An open-close door is installed at the hole opening, when the lane deforms, cannot normally use and needs to conduct dinting, a large quantity of gangue produced after lane dinting can be thrown to the inside by opening the door, and the lane is distributed in an air return along groove. Due to existence of a coal bed pitch, inbreak gangue surges up the goaf area of the transportation along grooves under the effect of gravity, in addition, side direction breaking is carried out on the top plate during caving, a lateral breaking angle is formed, a space at a button angle of the filling wall enables the inbreak gangue to be unable to achieving a filling area, a great quantity of spaces are left on the filling wall side, throwing gangue directly enters the goaf area under the effect of gravity, and deposit spaces are provided for processing undercover gangue.

Description

technical field [0001] The invention relates to a method for filling a wall of a gob entry, in particular to a method for filling a wall of a gob entry that is suitable for a reserved cavity channel that is suitable for producing a large amount of gangue to provide storage space after the gob entry is undercovered. Background technique [0002] Gobside retaining technology refers to the construction of filling belts (gangue, concrete or high-water materials) or other forms of roadside support beside the transport chute or return air chute while advancing in the upper section to maintain the roadway. In this way, the service of the next section can save one roadway, which can be used twice. It is a major reform of coal mining technology. Gob-side retaining is an advanced underground mining technology that can rationally develop coal resources, improve roadway maintenance, reduce roadway excavation, and is conducive to mine safety production and improved mine technical and eco...

AI Technical Summary

Problems solved by technology

However, due to the problem of a large amount of floor drum in the retaining roadway along the goaf, as the working face advances, the roadway needs to be affected by two mining operations, the mine pressure is strong, and the maintenance of the roadway is difficult. The loss even exceeds 60%, and the bottom drum accounts for more than 80% of the moving distance of the roof and floor. It is in a semi-closed state, causing ventilation and pedestrian difficulties. In order to ensure the normal use of the alley, undercover treatment must be carried out

Because there is no storage space for the gangue generated after undercover treatment in the existing entry retention, it is difficult to remove the gangue, the labor intensity of the workers is high, the section of the entry retention is small, the mechanical equipment is difficult to adapt, the multiple production system is very complicated, and the workload of auxiliary transportation increases.

Images