Roof-contacted method for mine gob-side entry paste filling wall body

Abstract

The invention discloses a roof-contacted method for a mine gob-side entry paste filling wall body. The roof-contacted method mainly comprises the following steps: installing a filling template according to a filling design width in a gob or roadway of a pre-filling section, and filling the filling template with a prepared paste-like filling material by using a filling pump; when the height of the filling material reaches 85%-90% of actual filling height, pushing the filling template through pressure of a jack, so that the filling material inside the filling template moves forward and is extruded to rise, after the filling material rises to contact a roof, maintaining the pressure of the jack, moving forward, extruding to rise the filling material, and after the filling material rises to contact the roof, maintaining the pressure of the jack until the filling material is finally solidified. Horizontal thrust is applied before the filling material is solidified, so that the width of a filling body is contracted and the height of the filling body is increased until the filling material is roof-contacted with the top plate of the roadway, and after the filling material is solidified, a gap formed between the wall body and the top plate is completely eliminated, so that the air leakage of the gob is avoided, and the self-combustion of coal is prevented.

Description

technical field [0001] The invention relates to a coal pillar-free mining technology in a coal mining face in a mine, in particular to a gob-side filling and entry retaining technology in a coal mining face in a mine. Background technique [0002] At present, roadside filling and gob-side entry retention is a pillar-free mining technology commonly used in mines at home and abroad. Usually, high-water materials, concrete and paste materials are used as roadside filling materials, and pre-proportioned filling materials are injected into In the filling formwork, the filling material solidifies and supports the lateral roof of the roadway, and retains the roadway to serve the working face of the next section. The implementation of gob-side entry retention technology can not only improve the recovery rate of coal resources and reduce production costs, but also help prevent major disasters such as mine rock burst, coal and gas outburst, and achieve sustainable development of mines...

AI Technical Summary

Problems solved by technology

Relatively speaking, the paste filling material is currently the most commonly used filling material for gob-side entry retention due to its high initial strength, long support time, and low cost. However, it cannot be effectively connected to the roof during the filling process, making the top surface of the wall There is a gap between the roof and the roof, which will not only cause the working face to sink sideways to the roof, impact and damage the filling body, but also easily lead to air leakage in the goaf and spontaneous combustion of coal in the goaf

[0003] In order to solve the roofing problem of roadside filling and goaf retention, Chinese Patent Publication No. CN101792291A discloses a high water expansion material. The expansion rate of this material can reach 10-30%. The expansion rate of the material causes the inside of the filling body to be honeycomb-shaped after the material is solidified, and the strength is greatly reduced. When the roof sinks too much, it is easy to cause the filling body to be damaged, and it cannot effectively support the overlying rock stratum, thus failing to achieve the goal of gob-side entry retention. purpose; in addition, the cost of this material is relatively high and cannot be widely used

Chinese Patent Publication No. CN102296987A discloses a soft medium roofing method for roadside filling and gobside entry retaining. It connects the roof by adding soft square wood or rubber materials, leather bags and other soft media between the filling body and the top plate. To a certain extent, the effect of combining the top surface of the filling body and the roof of the roadway has been achieved, but a certain height must be reserved between the filling body and the roof during construction, and then soft media materials are placed, and the strength of the soft material is required to be the same as that of the filling material after one day of solidification The compressive strength is the same or similar, the operation is cumbersome and the cost is high, and when the filling material is filled and the soft medium is not placed, the roof of the working face may sink under impact and damage the filling body

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