Coal and gas outburst coal seam reserved roadway mining method

Abstract

The invention discloses a coal and gas outburst coal seam reserved roadway mining method, mining is carried out in sequence from the first working face area to the Nth working face area; the method for mining any working face area is: the first step is to use The hydraulic prop supports the air inlet roadway in advance; the second step is to construct the pre-split drilling and carry out the pre-split work of the coal seam roof; the third step is to complete the first step and the second step within 50 meters in front of the initial working face After work, start coal mining; the fourth step is to inject water mixed with clay or chemical binder in the goaf; the air inlet roadway in the goaf is used as a reserved roadway, and the reserved roadway will be used in the next work When the surface area is mined, it is used as a return air roadway. The invention is composed of drilling hole expansion and energy gathering, constant stress anchor rod, goaf roof regeneration, excavation layout and gas drainage, etc., which can greatly reduce the excavation engineering amount of coal seam roadway, improve coal mining efficiency, and increase gas drainage time , to reduce the loss of coal resources.

Description

technical field [0001] The invention relates to the field of coal mining technology, in particular to safe coal mining technology and efficient coal mining technology. Background technique [0002] Coal accounts for more than 60% of my country's energy consumption, and China's coal production exceeds 1 / 2 of the world's production, of which high gas and coal and gas outburst mines account for 1 / 3 of the country's coal production. In order to mine coal, a large number of coal seam roadways need to be excavated every year, and the coal and gas outburst coal seam needs to eliminate the danger of coal and gas outburst before excavation and mining, so the excavation speed is slow, the mine mining is tense, and even the excavation is out of balance, which seriously affects the safety of the mine. Safe and efficient mining. When coal seams are excavated into roadways, in order to avoid the mine pressure in the mined area, most of them adopt the technology of coal pillar roadway pro...

AI Technical Summary

Problems solved by technology

In order to mine coal, a large number of coal seam roadways need to be excavated every year, and the coal and gas outburst coal seam needs to eliminate the danger of coal and gas outburst before excavation and mining, so the excavation speed is slow, the mine mining is tense, and even the excavation is out of balance, which seriously affects the safety of the mine. Safe and Efficient Mining

When coal seams are excavated into roadways, in order to avoid the mine pressure in the mined area, most of them adopt the technology of coal pillar roadway protection. Although the coal pillars are of different sizes, none of the coal pillars can be mined, resulting in a waste of resources

The stress concentration in the roadway near the goaf is very dangerous, and the roadway cannot be reserved for the next working face area

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