An integrated outburst prevention method for coal seam drilling, blasting, pumping and injection

Abstract

The invention discloses a coal seam drilling exploding extracting and injecting integrated anti-outburst method. The method comprises the steps that a specialized roadway for controlling gas is arranged in a coal seam roof or floor rocks, uniformly distributed extraction holes and exploding holes are formed in the coal seam from the specialized roadway for controlling gas, a loose blasting is conducted on coals surround a coal roadway by utilizing the exploding holes, and gas extraction is conducted by connecting the extraction holes with a gas drainage pipeline; when the gas extraction is finished, water injection holes are formed in the positions of the exploding holes and the water injection holes are sleeved with the exploding holes, a water injection is conducted on water injection holes by using the pressure water not exceeding 10 MPa in the coal mine, and the water injection is finished until water cannot be injected into the drilling holes or the water seeps from rocks surroundthe water injection holes. The 'drilling exploding extracting and injecting' integrated technique is capable of increasing the fracture of the coals, reducing the gas content and pressure around thecoal roadway, and improving the water content of the coals, and thereby reducing or even eliminating the risk of coal seam outburst.

Description

technical field [0001] The invention relates to an integrated outburst prevention method of coal seam drilling, blasting, pumping and injection, which can increase coal body fissures, reduce gas content and gas pressure, and increase coal water content, and is especially suitable for reducing the risk of coal and gas outburst in soft outburst coal seams. Background technique [0002] my country is the main coal-producing country in the world, and also one of the most serious coal and gas outburst countries in the world. 95% of its coal production comes from underground mining, while high gas and outburst mine coal production accounts for more than half. Especially when mining operations are carried out in coal seams with outburst risks, when the gas pressure is relatively high and the coal and rock mass is relatively soft and dry, coal and gas outburst accidents are prone to occur, which constitutes a serious threat to the life safety of employees. great harm. [0003] Curr...

AI Technical Summary

Problems solved by technology

While hydraulic fracturing technology forms cracks and unpressurized coal bodies, it will also form new stress concentration areas, which will cause new obstacles to the safe production of coal mines, and the damage range and direction of high-pressure water are uncontrollable. The effects still need to be investigated and improved; hydraulic punching and deep hole pre-splitting blasting enhance pressure relief and anti-reflection by increasing the diameter of the coal hole section, and increase the pressure relief and anti-reflection enhancement of the coal hole section of the part-through-bed drilling. The pumping effect, the process and process itself are more complicated, and the safety and reliability need to be further improved

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