Method for improving gas extraction efficiency of high extraction roadway

Abstract

The invention discloses a method for improving the gas extraction efficiency of a high extraction roadway. The method mainly comprises the following steps of arranging the high extraction roadway on a to-be-extracted working face adjacent to a rock stratum, calculating and determining a drilling distance and a roof caving step pitch, drilling two main and auxiliary holes in the high extraction roadway at intervals, and directly and circularly drilling downwards in the high extraction roadway, wherein the end hole position of a drill hole is on the working face and is parallel to the coal wall of the working face, then a silent breaking and expanding agent is used in the mode that a main hole is charged and an auxiliary hole is not filled, and after the silent breaking and expanding agent is filled, cracks are formed in the direct roof and the basic roof in advance, i.e. the main hole presplits the roof, and the auxiliary hole pumps and discharges gas on the working face. According to the method, the suspended roof fissure ratio is increased on the basis of extracting goaf gas and adjacent layer and surrounding rock gas of the high drainage roadway, the purposes of presplitting the roof and diluting and discharging the gas on the working face are achieved, and gas overrun is prevented.

Description

technical field [0001] The invention relates to a gas drainage method, in particular to a method for improving the efficiency of gas drainage in high drainage lanes. Background technique [0002] The gas explosion accidents caused by coal and gas outburst in my country recently are all caused by the escalation of gas disasters in the process of deep mining of coal mines. Therefore, it is necessary to grasp the key factor of gas production safety in coal mines and pay close attention to governance. Only in this way can gas accidents be eliminated. Only when it is lowered can the safety production situation of coal mines in our country be fundamentally changed. The gas problem, especially the gas control in low-permeability coal seams, is a worldwide problem and has not been solved for a long time. As a result, coal mine gas accidents occur frequently, production efficiency is low, and safe and efficient mining is difficult to achieve. As the depth of mine mining increases, th...

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Problems solved by technology

For this reason, the present invention provides a method for improving the efficiency of gas drainage in high-drainage lanes, which is used to solve the problem of poor gas extraction effect in high-drainage lanes. When the working face is pushed through, the high-drainage lanes can The gas in the rock strata and the gas in the working face are pumped into the roadway under negative pressure through the cracks, and the problem of gas exceeding the limit in the working face can be basically solved without affecting the normal recovery of the working face, effectively preventing the gas from exceeding the limit

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