采动力学特征下含瓦斯煤渗流实验研究

发布时间：2018-07-12 14:26

本文选题：采动应力 + 含瓦斯煤　；参考：《煤矿安全》2017年08期

【摘要】：为研究采动应力对煤体渗透率的影响,采用渗流实验和理论分析的方法,对2个矿的2组煤样在2种采动应力下的渗流特性进行了研究,并揭示了渗透率变化规律。结果表明:2种采动应力下渗透率整体变化规律相似,但各阶段渗透特性不同;在准静水压力阶段,渗透率都随应力增加而下降,保护层采动应力下的渗透率总体大于放顶煤;在第二加卸载阶段,放顶煤采动应力下渗透率呈现缓慢上升,水平应力卸载对渗透性系数影响起主要作用,而保护层采动应力下是阶段末期才开始上升;2种采动应力下渗透率呈现低速增长、增长和高速增长阶段,特别在工作面应力峰值点后,进行抽采效果较理想。
[Abstract]:In order to study the influence of mining stress on coal permeability, the seepage characteristics of two groups of coal samples in two mines under two kinds of mining stress were studied by seepage experiment and theoretical analysis, and the regularity of permeability change was revealed. The results show that the whole permeability variation law is similar under the two kinds of mining stress, but the permeability characteristics are different in each stage, at the stage of quasi-hydrostatic pressure, the permeability decreases with the increase of stress, and the permeability under mining dynamic stress in protective layer is generally larger than that in top coal caving. In the second loading and unloading stage, the permeability of caving coal increases slowly under the mining stress, and the horizontal stress unloading plays a major role in influencing the permeability coefficient. Under mining stress, the permeability increases at low speed, increases at high speed, and increases at high speed, especially after the peak stress of working face, the extraction effect is better.
【作者单位】：山西工程技术学院矿业工程系;中国矿业大学(北京)资源与安全工程学院;中国矿业大学(北京)共伴生能源精准开采北京市重点实验室;中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;
【基金】：国家重点研发计划资助项目(2016YFC060708-1) 国家自然科学基金资助项目(51374216)
【分类号】：TD712

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