Road retained method for extrusion molding of waste rock

Abstract

The invention relates to a road retained method for extrusion molding of waste rock, belonging to the technical field of mine exploitation and comprising the following steps of: (1) fixing a template beside the road to be retained, wherein the template is placed vertically and parallel to the road, faces to a goaf, and a certain distance is maintained between the template and the goaf to form an area to be filled; (2) smashing the waste rock into granules, adding cementitous materials to stir uniformly to form filler; (3) filling the filler in the area to be filled to form an infill; and (4) removing the template and moving the template along the work surface, and then entering the next filling circle. The invention realizes a retained road by using the waste rock as raw materials, changes waste material into things of value, and reduces discharging pollutants of waste rock; a rock bolt is added beside the road so that the stability of the retained road is increased; comprehensive mechanic operation is adopted, thereby the labor intensity is reduced and the efficiency is improved; opened operation is adopted, therefore, the problems of pipe blocking and the like are avoided and better reliability are achieved; the extraction and support for the retained road are free from cross interference and in great safe condition; and the obtained infill has great width, reasonable structure, low air leakage ratio and great reliability.

Description

technical field [0001] The invention belongs to the technical field of mining and relates to a method for filling gob-side entry retention with gangue. Background technique [0002] The technology of retaining roadway along the gob means that when the coal mining face is recovered, the roadway support is not retracted and strengthened measures are taken to keep the roadway as the machine roadway or return airway of the adjacent working face. This technology has the following advantages, especially It is suitable for the stope where the succession is tense, the mining face is difficult to arrange, and the pressure is not high: first, the gob-side entry retaining can reduce the loss of coal pillars and improve the recovery rate of coal resources; After the roadway is retained along the goaf, the adjacent working face can continue to drain gas on the side of the retaining roadway, so that the gas drainage time of the adjacent working face will be doubled, the effect of gas drai...

AI Technical Summary

Problems solved by technology

However, the material stone is a brittle material, which is severely deformed and damaged after being subjected to mining pressure, and the maintenance workload is large

2) Dense pillars and wooden stacks are only suitable for blast mining low gas thin and medium-thick coal seam coal mining face. This method has serious air leakage, large material consumption, poor roadway maintenance effect, and low degree of mechanization

However, the filling material cost of this method is high, the width of the roadside filling body is narrow (generally 2-3m), and the pressure bearing capacity is insufficient; the filling process is complicated, and accidents of slurry leakage often occur; material processing and filling equipment are expensive, etc.

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