基于COMSOL Multiphysics的超长钻孔瓦斯抽采数值模拟研究

发布时间：2018-03-01 23:14

本文关键词： 千米钻孔预抽瓦斯 COMSOL Multiphysics 瓦斯抽采数值模拟　出处：《煤矿安全》2017年08期 　论文类型：期刊论文

【摘要】：利用COMSOL Multiphysics对马兰矿南5采区9#煤层采用的千米钻孔煤层预抽瓦斯来掩护集中回风巷掘进的工程,进行瓦斯抽采钻孔深度不同、抽采负压不同、抽采时间不同条件下瓦斯压力分布规律和抽采瓦斯总量的数值模拟研究。得出结论:瓦斯抽采初期,瓦斯抽采重点区域在径向距离较小以及钻孔较浅区域,随着抽采时间的增加,瓦斯抽采重点区域向径向距离较大以及钻孔深处转移;钻孔深度越大,瓦斯抽采难度越大,适当提高瓦斯抽采负压能够有效提高钻孔深处瓦斯抽采效率;抽采负压为13 k Pa,钻孔总深度为600 m时,抽采瓦斯有效时间为500 d左右;抽采负压为13 k Pa,钻孔总深度为700 m时,抽采瓦斯有效时间为600 d左右。
[Abstract]:This paper uses COMSOL Multiphysics to cover the project of concentrated backwind roadway tunneling by using kilometer drilled coal seam pre-drainage in 9# coal seam of Nan5 mining area of Ma Lan Mine, and carries out different drilling depth and negative pressure of gas extraction. Numerical simulation study on the distribution of gas pressure and the total amount of gas extraction under different extraction time. It is concluded that in the early stage of gas extraction, the key area of gas extraction is smaller in radial distance and shallow in borehole. With the increase of extraction time, the radial distance of the key area of gas extraction is larger and the depth of borehole is transferred; the greater the depth of borehole, the more difficult the gas extraction is, the higher the negative pressure of gas extraction is, the more the efficiency of gas extraction can be effectively improved. The effective time of gas extraction is about 500 days when the negative pressure of extraction is 13kPaand the total depth of borehole is 600m, and when the negative pressure is 13kPaand the total depth of borehole is 700m, the effective time of gas extraction is about 600d.
【作者单位】：太原理工大学矿业工程学院;
【分类号】：TD712.6

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