作　　者： (蔡培培）; (赵耀江）; (郭金岩）;

机构地区： 太原理工大学矿业工程学院,山西太原030024

出　　处： 《煤矿安全》 2017年第8期132-135,共4页

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。 By using COMSOL Multiphysics simulation software, the numerical simulation of gas pressure distribution law and total gas drainage was carried out under the condition of different gas drainage depth, different suction pressure and different pumping time in the engineering, which utilizes pre-pumping gas in kilometer drilling hole to cover the excavation of central return air roadway in south NO.5 mining area 9#coal seam of Malan Mine. We obtain that the key area of gas drainage transfers to the region of large radial distance and the depth of the hole from the region of less radial and the shallow of the hole with the increase of the number of pumping time. The greater the depth of drilling, the greater the difficulty of gas drainage. And the appropriate increase of the negative pressure of gas drainage can effectively improve the gas drainage efficiency of the depth of the drill hole. The effective number of gas drainage time is 500 days or so when the negative pressure is 13 k Pa and the total depth is 600 m; the effective number of gas drainage time is 600 days when the negative pressure is 13 k Pa and the total depth of the borehole is 700 m.

关 键 词： 千米钻孔 预抽瓦斯 瓦斯抽采 数值模拟