煤矿安全2025，Vol.56Issue(5)：87-99,13.DOI:10.13347/j.cnki.mkaq.20250380
考虑蠕变效应的复合煤层定向水力冲孔工艺参数研究
Research on process parameters of directional hydraulic punching considering creep effect in composite coal seam
摘要
Abstract
With the increasing depth of coal mining and the difficulty of gas control in China,the technology of directional hydraulic punching to enhance gas extraction in composite coal seam has been widely promoted and applied.In order to further improve the ef-ficiency and effectiveness of directional hydraulic punching in composite coal seam,we carry out the study on the influence of coal rock creep effect on parameters such as directional punching pressure relief time,punching spacing,and punching diameter;based on the theory of creep effect and actual on-site conditions,a simulation scheme for directional punching process parameters considering creep effect is proposed,the influence of creep effect on directional hydraulic punching is compared and analyzed by numerical sim-ulation,the process parameters of directional punching considering creep effect is designed and verified through on-site experiments.The results indicate that,compared to the Mohr Coulomb model,the simulation results of considering creep effect are more in line with the actual situation on site;when the creep effect is considered,the pressure relief zone,plastic zone,and creep displacement range around the directional hydraulic punching hole in the composite coal seam increase with the increase of creep time and punch-ing diameter,and the time required for coal rock creep and pressure relief between boreholes increases with the increase of borehole spacing;based on the on-site situation and the simulation results of composite coal seam directional punching parameters consider-ing creep effect,the designed punching pressure is 26 MPa and the spacing between holes is 6 m;the creep range has covered the coal and rock between the boreholes within 30 days of directional punching in the composite coal seams,and different degrees of pressure relief have appeared the creep range,which has greatly shortened the period of pressure relief and gas extraction,and at the same time,it has improved the efficiency of hydraulic punching.The research on process parameters of the directional hydraulic punching technology considering creep effect in composite coal seam is expected to further improve the efficiency of pressure relief and gas extraction.关键词
复合煤层/软分层/定向水力冲孔/蠕变卸压/工艺参数Key words
composite coal seam/soft sub-layer/directional hydraulic punching/creep pressure relief/process parameter分类
矿山工程引用本文复制引用
刘毅,李定启,陈宇博..考虑蠕变效应的复合煤层定向水力冲孔工艺参数研究[J].煤矿安全,2025,56(5):87-99,13.基金项目
国家自然科学基金资助项目(51404094) （51404094）
山西省煤层气联合基金资助项目(2012012010) （2012012010）
河南省科技攻关重点资助项目(232102320231) （232102320231）
