摘要
基于构建的顺层钻孔瓦斯抽采流固耦合模型,利用COMSOL模拟软件,结合某矿3901工作面的实际情况,开展本煤层顺层钻孔不同瓦斯抽采时间、钻孔间距的数值模拟研究。结果表明,有效抽采半径随着抽采时间的增加先快速增加后逐渐变缓,有效抽采半径与抽采时间呈对数函数关系,当抽采时间超过180 d时,抽采时间对有效抽采半径的影响较小,考虑采掘接续确定该工作面合理的抽采时间为180 d;抽采钻孔间距对煤层瓦斯压力的下降和抽采效果影响显著,布孔间距越小钻孔之间瓦斯压力下降幅度越明显,为了有效避免了“空白带”和抽采的无效叠加,结合3901工作面的实际情况,确定瓦斯抽采180 d后最合理的钻孔间距为6 m。
Based on the fluid-solid coupling model of gas drainage from bedding drilling,this paper carried out numerical simulation research on different gas drainage time and different hole spacing of bedding drilling in this coal seam by using COMSOL simulation software and combining with the actual situation of No.3901 working face in a certain mine.The results show that with the increase of extraction time,the effective extraction radius firstly increases rapidly and then gradually slows down.The effective extraction radius has a logarithmic function with the extraction time.When the extraction time exceeds 180 d,the extraction time has little influence on the effective extraction radius.Considering the mining continuity,the reasonable extraction time of this working face is 180 d.The spacing between extraction boreholes has a significant impact on the decrease of coal seam gas pressure and the extraction effect.The smaller the spacing between boreholes,the more significant the decrease in gas pressure between them.In order to effectively avoid the ineffective superposition of"blank zone"and extraction,combined with the actual situation of No.3901 working face,the most reasonable drilling spacing after 180 d of gas extraction is determined to be 6 m.
作者
于宝种
申孟起
刘佳佳
吴金刚
Yu Baozhong;Shen Mengqi;Liu Jiajia;Wu Jingang(CCTEG Chongqing Research Institute,Chongqing 400037,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Provincial and Ministerial Collaborative Innovation Center for Coal Safety Production and Clean and Efficient Utilization,Jiaozuo 454003,China;Henan University of Engineering,Zhengzhou 451191,China)
出处
《能源与环保》
2023年第11期75-81,共7页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家自然科学基金项目(52074106)
河南省优秀青年基金项目(222400420036)
河南理工大学创新型科研团队(T2023-3)
瓦斯灾害监控与应急技术国家重点实验室开放基金(2021SKLKF01)
深部煤矿采动响应与灾害防控国家重点实验室开放基金项目(SKLMRDPC22KF11)。
关键词
顺层钻孔
瓦斯抽采
流固耦合
数值模拟
bedding drilling
gas drainage
fluid-solid coupling
numerical simulation
