Roadway self-stabilizing and goaf filling method in coal-pillar-free mining

Abstract

The invention discloses a roadway self-stabilization and goaf filling method in coal pillar-free mining, in the filling method, two bearing devices of grout stopping walls and pier studs are respectively designed, three cycles are used as a stage, namely three grout stopping walls are designed in advance, two pier studs are arranged in each grout stopping wall, and the interval between the grout stopping walls is 20-30 m. The grout stop wall can prevent goaf filling grout from overflowing to a working face to affect normal stoping. The pier columns support the roadway top plate, enable the roadway to be kept in a complete state and have filling space, and the pier columns are used at intervals, so that the bearing effect of the filling body in the roadway is exerted, and the filling cost is reduced.

Description

technical field [0001] The invention relates to the field of goaf filling, in particular to a method for roadway self-stabilization and goaf filling in non-coal pillar mining. Background technique [0002] Traditional longwall working face mining requires two roadways, and even four roadways for high gas coal seams, which greatly increases the cost of coal pillar legacy. In response to green mining, coal pillar-free mining is currently widely used. coal mining. However, during non-coal pillar mining, the roof of the goaf collapsed very sufficiently, which led to the subsidence of the ground surface. In order to avoid surface subsidence, in the non-coal pillar mining, the goaf usually needs to be filled. Filling the gobs in pillar-free mining alone, because with the mining of the working face, the roadway collapses with the mining, and the filling space is insufficient, which will inevitably lead to the failure of the gob to be completely filled, and thus cannot guarantee th...

AI Technical Summary

Problems solved by technology

Filling the goaf in non-coal pillar mining only, because the roadway collapses with the mining, and the filling space is insufficient due to the mining of the working face, which will inevitably lead to the failure of the gob to be completely filled, and thus cannot guarantee the solution to the problem of surface subsidence

[0003] If the traditional coal-pillarless mining is adopted, in order to retain the roadway and reserve the filling space, the roadside filling body is reserved in the entire roadway, which will inevitably increase the filling cost. The roof of the area is cut along the position of the filling body and collapses, which further reduces the filling space and is not conducive to the filling of the goaf

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