A method of using pulse detonation wave to fracture and increase penetration to shield coal roadway excavation

Abstract

The invention discloses a method for using pulse detonation waves to fracture and increase penetration to shield coal roadway excavation, which is suitable for rapid excavation of coal roadways in high-gas and low-permeability coal seams. Firstly, the drilling rig is used to construct detonation drainage drilling from the bottom pumping roadway to the coal seam, and then the high-voltage electric pulse generator is sent into the detonation drainage drilling, and then the high-voltage electric pulse generator is controlled to detonate through the explosion-proof console. The wall of the drainage borehole repeatedly releases high-energy pulse detonation waves many times. After a large number of cracks are formed in the coal body around the detonation drainage borehole, the detonation drainage borehole is connected to the gas drainage pipeline. After the gas drainage reaches the standard The excavation of the coal roadway can be carried out. The invention utilizes the high energy of the pulse detonation wave to crack the coal body, forms a network of fissures in the coal seam, provides channels for the gas flow, improves the efficiency of pre-pumping coal seam gas by drilling through the seam, shortens the time for gas pre-pumping, and realizes the rapid operation of the coal roadway. excavation.

Description

technical field [0001] The invention relates to a method for using pulse detonation waves to create cracks and increase penetration to protect coal roadway excavation, and is especially suitable for underground coal mine high-gassy and low-permeability coal seam bottom pumping roads to penetrate layers and drill holes to protect coal roadway excavation. Background technique [0002] Most coal seams in my country generally have the characteristics of high gas and low gas permeability, and the gas extraction is difficult and efficient. Therefore, artificially increasing the permeability of the coal seam, increasing the permeability of the coal seam, and then improving the concentration and efficiency of gas extraction in the coal seam are the main measures to solve the problem of gas gushing and gas exceeding the limit in the process of coal roadway excavation. At present, commonly used coal seam fracturing and permeability enhancement measures include hydraulic cutting, hydra...

AI Technical Summary

Problems solved by technology

At present, commonly used coal seam fracturing and permeability enhancement measures include hydraulic cutting, hydraulic fracturing, deep hole loosening blasting, etc. Although some achievements have been achieved, there are still some limitations. It is difficult to control the direction, and it is difficult to send explosives in deep hole loosening blasting, etc.

These shortcomings limit the field application of the existing coal seam fracturing and permeability enhancement measures, and affect the driving efficiency of the coal seam coal roadway

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