基于COMSOL的顺层抽采钻孔漏气通及带压封孔技术研究

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英文篇名：Research on Leakage Channel and Pressurized Hole Sealing Technology for Bedding Drainage Hole Based on COMSOL 作者：乔元栋 ; 程虹铭 英文作者：QIAO Yuan-dong;CHENG Hong-ming;College of Coal Engineering,Datong University;College of Geosciences and Surveying Engineering,China University of Mining and Technology (Beijing);College of Resources and Safety Engineering,China University of Mining and Technology (Beijing); 关键词：顺层钻孔 ; 流-固耦合 ; 漏气通道 ; 主动支护封孔 英文关键词：hole drilled along seam;;fluid-solid coupling;;leakage channel;;initiative support sealing 中文刊名：MKSJ 英文刊名：Coal Engineering 机构：山西大同大学煤炭工程学院;中国矿业大学(北京)地球科学与测绘工程学院;中国矿业大学(北京)资源与安全工程学院; 出版日期：2019-07-20 出版单位：煤炭工程 年：2019 期：v.51;No.499 基金：山西省教育厅科技处项目(2017164);; 大同市应用基础研究计划项目(2017128) 语种：中文; 页：MKSJ201907026 页数：6 CN：07 ISSN：11-4658/TD 分类号：124-129

摘要

回顾了封孔效果影响因素,基于流-固耦合作用下顺层钻孔漏气通道模型,研究了钻孔周围应力及主动支护封孔技术效果,结果表明:钻孔钻进经历巷道前方"三带",应力集中带内煤体裂隙发育;随着距钻孔壁距离的增加,钻孔施工的二次扰动作用逐渐减小,钻孔卸压松动圈与巷道卸压松动圈叠加效应出现在孔周局部范围内,并共同形成钻孔漏气主要通道;无支护力作用下,抽采负压与巷道大气压在短时间内,很容易通过钻孔卸压松动圈裂隙与巷道壁的卸压裂隙连通,形成漏气通道;支护力作用下,加固了孔周煤体,愈合卸压裂隙,减小漏气通道,加大了有效抽采时间,且随着支护力的增大,这种效果更明显。进一步试验了主动支护封孔技术,与原有普通囊袋式封孔相比,主动支护封孔单孔日平均抽采浓度提高近3倍,单孔日平均抽采纯量提高近1. 6倍,主动支护封孔效果好,理论分析结果得到验证。
        The influencing factors of sealing effect were reviewed,the stress around borehole and the initiative support sealing technology were analyzed based on fluid-solid coupling leakage channel model of hole drilled along seam. The results showed:drilling went through " three zones" of in front of roadway,fracture further developed in stress concentration zone; the effect of two disturbances decreased with increase of distance from borehole wall,the superimposed effect of relaxation zone of borehole and roadway appeared local area around borehole,and here the leakage channel formed; without support force,the drainage negative pressure communicated atmosphere easily with in a short time through fracture of borehole and roadway pressure relief,and leakage channel was established; the coal around borehole was reinforced,the relief fracture was healed,leakage channel decreased and the effective drainage time increased with support force,and the effect was more obvious with increase of support force. Further,the initiative support sealing technology was tested,and the results showed: daily average drainage concentration and daily average drainage purity of single hole was nearly 3 times and 1. 6 times higher than ordinary capsular bag sealing,and theoretical analysis results were verified.

引文

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