煤体膨胀致裂增透技术研究现状与展望OA北大核心CSTPCD

Safely and effectively increasing the permeability of coal seams and improving the efficiency of coalbed methane extrac-tion is the key to promoting efficient energy utilization.With the increase of coal mining depth in China,the difficulty of coalbed methane mining is increasing,and the risk of gas outbursts is becoming more and more serious.The expansion fracturing technology has the unique advantages of no noise,no vibration,and no dust,which makes it have broad application prospect in the field of coal seam permeability enhancement.Through the investigation and analysis of the existing research results,the reaction mechanism of static expansion materials and the mechanism of expansion cracking and permeability improvement were analyzed,and the influ-ence of parameters such as borehole diameter,spacing,and shape on the cracking effect of the coal body was combed,and the mech-anical models of coal damage(coal damage fracture model and crack propagation model)in the process of expansion cracking were summarized,and the application status of expansion cracking technology in the field of coal seam permeability enhancement was ex-pounded,and the research direction and development suggestions of expansion fracking technology in the field of coal seam per-meability enhancement were proposed.