蠕变-渗流耦合作用下不同埋深有效抽采半径研究

发布时间：2018-03-09 19:34

本文选题：有效抽采半径　切入点：蠕变-渗流耦合　出处：《煤炭学报》2017年10期 　论文类型：期刊论文

【摘要】：为了研究不同埋深有效抽采半径,建立了钻孔周围煤体黏弹塑性模型,研究了不同埋深钻孔孔径变化规律及有效抽采时间,建立了蠕变-渗流耦合作用下的瓦斯运移模型,确定了不同埋深钻孔的有效抽采半径。研究结果表明:深部煤层有效抽采半径受到煤体蠕变变形加剧、渗透率降低及瓦斯压力升高的综合作用;试验矿井埋深400及600 m煤体蠕变变形较为平缓,钻孔缩孔幅度有限,仍维持较好的抽采通道,所有抽采时间均为有效抽采时间,但是埋深800 m煤体蠕变变形愈加剧烈,钻孔缩孔速度快速增加,仅30 d就会堵塞抽采通道,其有效抽采时间仅为30 d;埋深400,600和800 m钻孔3个月的有效抽采半径分别为2.88,1.62和0.82 m,数值计算结果与现场实测相吻合,研究成果可为抽采钻孔的优化布置提供参考。
[Abstract]:In order to study the effective extraction radius of different buried depth, the viscoelastic-plastic model of coal body around the borehole is established, the variation law of pore diameter and effective extraction time are studied, and the gas migration model under the coupled action of creep-seepage is established. The effective extraction radius of different buried depth boreholes is determined. The results show that the effective extraction radius of deep coal seam is aggravated by the creep deformation of coal body, the permeability is reduced and the gas pressure is increased. The creep deformation of 400 and 600 m coal body in the test mine is relatively gentle, the amplitude of hole shrinkage is limited, and the good extraction passage is maintained. All extraction time is effective extraction time, but the creep deformation of 800 m buried coal body becomes more severe. The shrinkage velocity of borehole increases rapidly, and the extraction passage will be blocked in only 30 days, and the effective extraction time is only 30 days, and the effective extraction radius of 400,600 and 800m boreholes for 3 months is 2.88 ~ 1.62 and 0.82 m, respectively. The numerical results are in good agreement with the field measurements. The research results can provide a reference for the optimal layout of extraction drilling.
【作者单位】：河南理工大学河南省瓦斯地质与瓦斯治理重点实验室——省部共建国家重点实验室培育基地;煤炭安全生产河南省协同创新中心;中煤科工集团西安研究院有限公司;
【基金】：国家自然科学基金资助项目(51404099,51374095,51604092)
【分类号】：TD712.6

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