Method for replacing middle bottom-extraction rock roadway with bottom-extraction rock roadway kilometer directional long borehole

Abstract

The invention relates to a method for replacing a middle bottom-extraction rock roadway with a bottom-extraction rock roadway kilometer directional long borehole. According to the method, a construction mode for commonly constructing a gate road bottom-extraction rock roadway in a high-gas outburst mine to protect stope face gate road roadway excavation is utilized, a coal body in front of a common crossing hole pre-extraction roadway is constructed on the gate road bottom-extraction rock roadway, before the stope face gate road roadway and a standby stope face gate road roadway are constructed, advanced construction is carried out on the gate road bottom-extraction rock roadway, a drill site is constructed in the gate road bottom-extraction rock roadway, a crossing kilometer directional long borehole is constructed in the drill site, and advanced extraction is carried out on gas of a working face of an upper working seam. The method has the beneficial effects that the mining economiccost and the time cost of the working face are saved, the outburst risk and the gas emission quantity during the mining period of the working face are fundamentally eliminated, and the safe and efficient production of a mine is guaranteed.

Description

technical field [0001] The invention relates to a gas drainage method with long boreholes in underground coal seams of coal mines, which is suitable for mines with high gas and coal and gas outbursts in coal seams containing gas, and is specifically a kind of bottom pumping rock roadway with 1000m directional long holes instead of middle bottom pumping rocks Lane method. Background technique [0002] High gas, coal and gas outburst mines are generally rich in high concentration and large volume of gas. In order to safely mine coal within the mine field, ground drilling pre-drainage, protective layer mining, regional progressive drainage, high Regional gas control measures such as rock mining and bottom pumping mining can effectively reduce the gas content and pressure of pre-mined coal bodies, eliminate the risk of coal and gas outbursts, and ensure that personnel are protected during mining activities in the coal seam. safety. [0003] At present, coal and gas outburst mi...

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Problems solved by technology

[0004] In order to alleviate some of the above-mentioned high gas and outburst mines, due to the soft coal seam, the drilling construction and hole formation in this coal seam are difficult, and the coal seam has poor air permeability, etc., it is necessary to construct the middle bottom pumping rock roadway in the lower part of the mining face, resulting in huge engineering volume and investment costs. To solve the problem, the present invention provides a method for substituting the middle bottom pumping roadway with a kilometer long directional drilling hole in the bottom pumping rock roadway. At the same time, in the construction of the bottom pumping rock roadway along the trench, the directional long drill hole with a thickness of 1000 meters is used to pre-pump the coal body in the mining face in advance, so as to save the construction of a bottom pumping rock roadway in the middle of the mining face. Utilization efficiency of the rock roadway at the bottom of the trench, the coal body in the mining face is pre-drained in advance by using the directional long drill hole that penetrates the layer of 1000 meters, which has the advantages of fast drilling construction progress, good hole quality, and high extraction efficiency. It is of great practical significance to efficiently extract and prevent gas from high-gas and outburst mines in soft and low-permeability coal seams

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