采动条件下煤体渗流特性试验及应用

发布时间：2018-03-22 11:18

本文选题：采矿工程　切入点：采动卸压　出处：《煤矿安全》2017年01期 　论文类型：期刊论文

【摘要】：为准确判断高瓦斯低透气性煤层瓦斯采动卸压抽采的有效区域,进一步提高瓦斯抽采效果,采用渗流试验和理论分析的方法,研究了煤层采动过程中煤体渗透率随应力的变化规律。结果表明:在受采动影响不同阶段,含瓦斯煤体渗透率随应力变化呈现明显的阶段差异性。在煤体弹性变形阶段,煤体渗透率随应力的增加逐步降低;在煤体达到屈服点至煤体破坏阶段,随着应力的升高,煤体发生塑性变形,煤体内产生采动裂隙,渗透率开始缓慢提升;在煤体破坏后,煤体处于卸压状态,煤体渗透率随着应力的降低大幅提升。最后,通过现场本煤层瓦斯抽采效果分析验证了采动煤体渗流特性试验结果的正确性。
[Abstract]:In order to accurately judge the effective area of gas extraction in high gas and low permeability coal seam, and further improve the effect of gas drainage, seepage test and theoretical analysis are adopted. The variation law of coal permeability with stress during coal seam mining is studied. The results show that the permeability of gas-bearing coal shows obvious difference with stress in different stages affected by mining, and at the stage of elastic deformation of coal body. The permeability of coal decreases gradually with the increase of stress, and when the coal reaches the yield point to the stage of coal failure, with the increase of stress, plastic deformation occurs in the coal body, the mining fissure occurs in the coal body, and the permeability begins to increase slowly. The coal body is in a state of pressure relief, and the permeability of coal body is greatly increased with the decrease of stress. Finally, the correctness of the experimental results of seepage characteristics of mining coal body is verified by the analysis of the gas drainage effect of the coal seam in the field.
【作者单位】：煤炭资源与安全开采国家重点实验室(中国矿业大学(北京));中国矿业大学(北京)资源与安全工程学院;潞安环能股份有限公司五阳煤矿;
【基金】：煤炭资源与安全开采国家重点实验室大学生科技创新计划资助项目(SKLCRSM16DC03);煤炭资源与安全开采国家重点实验室开放课题资助项目(SKLCRSM16KFB08) 国家大学生创新训练资助项目(C201501003)
【分类号】：TD712.6

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