Method for gas prevention and treatment during stoping period of coal mining working face of coal mine

Abstract

The invention discloses a method for gas prevention and treatment during the stoping period of the coal mining working face of a coal mine. The method comprises the steps that firstly, a drilling hole is formed in the position, of every other two or three hydraulic brackets, of a goaf behind a hydraulic bracket shielding beam; secondly, a first grouting pipe is laid between front connecting rods and stand columns of the multiple hydraulic brackets, a three-way connector is reserved on the position, corresponding to the drilling hole, of the first grouting pipe and provided with a branched hose, and after all the drilling holes are constructed, the branched hoses are connected with the drilling holes; and finally, a second grouting pipe is pre-buried in a non-coal-mining slope base plate of a ventilation roadway, the first grouting pipe communicates with the second grouting pipe in a three-way mode, a first valve is arranged at the communicating position of the first grouting pipe and the second grouting pipe, a colloid material starts to be pressure-injected when the first grouting pipe enters the goaf and is 5-8 m away from a return air corner, meanwhile, the first valve is opened, and the colloid material is pressure-injected into the first grouting pipe, and circulation is repeated in this way. By adoption of the method, the situations of gas overrunning during the stoping period of the coal mining working face can be reduced, and the safety degree of the mine during the stoping period is improved.

Description

technical field [0001] The invention relates to the technical field of gas control in coal mine working faces, in particular to a method for preventing and controlling gas during mining of coal mining working faces in coal mines. Background technique [0002] More than 95% of coal seams mined in mines with high gas and coal and gas outbursts in my country are low-permeability coal seams, which are difficult to extract gas and have a low extraction rate. A large area of ​​goaf is formed, and a large amount of gas is accumulated. Methane gushing out of coal mining face accounts for a large proportion of mine gas sources. According to statistics, in the early stage of new mines being put into production, the gas gushing out of the coal mining face accounted for a relatively small proportion of the total gas gushing out of the mine. Especially in the old mines with a long mining life, the coal mining face of the adjacent seam or the thick coal seam layered mining, the gas emiss...

AI Technical Summary

Problems solved by technology

These technologies have played a certain role in ensuring the safe production of mines. However, because gas control in coal mining faces is affected by factors such as terrain, ground pressure, and coal seam occurrence conditions, these technologies have low drainage concentrations, large construction volumes, and It costs a lot of money and a series of disadvantages, such as the low extraction rate of the embedded pipeline method, and the extracted concentration is usually only 10-25%; There are long drainage time and tight drainage succession with the layer-penetrating drilling method.

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