Research Status and Development Trend of Gas Extraction and Permeability Enhancement Technology in Coal Mine

Gas drainage constitutes the cornerstone of coal mine safety production, with permeability enhancement technology being pivotal to addressing challenges in managing gas in low-permeability, high-outburst coal seams. China's coal mines feature complex geological conditions, where 90% of high-outburst seams exhibit permeability levels ranging from 10⁻¹⁸ to 10⁻²⁰ m², representing typical low-permeability coal seams. This paper systematically reviews the research status and applicability of traditional technologies such as mining release layers, hydraulic permeability enhancement, and loose blasting. It highlights the development progress and engineering applications of emerging technologies including controllable shock waves, dehydration-based permeability enhancement, and supercritical CO₂ jet technology. The study analyzes current technical limitations and outlines future trends toward intelligent, green, integrated, precise, and deep-layered solutions, providing technical references for efficient coal mine gas management.