Coal and gas outburst coal seam reserved roadway exploitation method

Abstract

The invention discloses a coal and gas outburst coal seam reserved roadway exploitation method. Exploitation is conducted in the sequence from first working panel area to the Nth working panel area. Any working panel area exploitation method includes the steps that firstly, advance support is conducted on intake airways through hydraulic supporting columns; secondly, pre-splitting hole drilling isconstructed, and coal seam roof pre-splitting working is conducted; thirdly, coal exploitation is started after the first and second steps are completed in the range of fifty meters in front of the initial working panel; and fourthly, water mixed with clay or chemical binders is injected in the mined-out area; and the intake airways in the mined-out area are taken as reserved airways, and the reserved airways are taken as ventilation airways during exploitation of the next working panel. The coal and gas outburst coal seam reserved roadway exploitation method is composed of drilling hole caving energy accumulation, constant stress anchor rod, regeneration and exploitation and distribution of the top plate of the mined-out area, and extraction of the gas, the tunneling construction amountof the coal seam airways can be shrunk by a large amount, the coal mining efficiency is improved, the extraction time of the gas is increased, and the coal resource loss is reduced.

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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