潘一矿远距离下保护层开采卸压瓦斯抽采技术研究

发布时间：2018-05-02 23:01

  本文选题：下保护层开采 + 煤岩变形　； 参考：《安徽理工大学》2013年硕士论文

【摘要】：我国大多数煤矿区煤层赋存具有变质程度高、低渗透率、含气低饱和的特点,而淮南矿区具有煤层瓦斯含量高、煤质松软、透气性低、瓦斯压力大的典型特征,所以强化卸压瓦斯抽采是治理瓦斯的必要措施。本文运用理论分析及数值模拟的方法,针对潘一矿下保护层开采条件下卸压瓦斯抽采技术进行了研究。基于煤岩瓦斯耦合理论,应用数值模拟软件RFPA2D模拟了下保护层开采后上覆煤岩层的变形及裂隙发育规律、卸压瓦斯运移规律；进而运用卸压瓦斯抽放理论,结合潘一矿下保护层1551(1)综放面的现场实际,分析运用下保护层开采,采用底抽巷+上向穿层钻孔抽采技术、地面钻孔抽采技术相结合的布置方式来抽采远程上被保护层卸压瓦斯。得到首先开采保护层11-2煤,可以引起上覆岩层的变形、移动,进而产生“卸压增流效应”,利用岩层移动规律选择合理有效的瓦斯抽采方法可以提高瓦斯抽采效率、瓦斯抽采浓度,获得良好的抽采效果。 通过潘一矿下保护层开采现场试验,考察得到被保护层13-1煤层的最大膨胀变形量210.5mm,最大膨胀变形率为42.1‰；透气性系数由0.00975m2/MPa2·d增大到12.15m2/MPa2·d,增大了1246倍；走向保护角为60°,倾向保护角分别为Φ1=76°,Φ2=83°。上覆卸压的远距离被保护层工作面,采用底板岩巷+网格式上向穿层钻孔、地面钻孔相结合技术进行瓦斯抽采,上被保护13-1煤层最大残余瓦斯压力降为0.5MPa,计算得到残余瓦斯含量为3.2m3/t,被保护范围内煤层最大瓦斯抽采率可达到62.3%。数据表明被保护层的瓦斯压力和含量得到有效降低,突出危险性得到消除,被保护层获得了良好的卸压瓦斯抽采效果。由试验验证结果可以看出所采取的卸压瓦斯抽采技术措施达到了良好的效果。
[Abstract]:Most coal seams in China have the characteristics of high degree of metamorphism, low permeability, low gas saturation, while Huainan mining area has the typical characteristics of high gas content, soft coal quality, low permeability and high gas pressure. Therefore, strengthening pressure relief gas drainage is a necessary measure to control gas. In this paper, theoretical analysis and numerical simulation are used to study the pressure relief gas drainage technology under the condition of mining under the protection layer of Panyi Mine. Based on the coupling theory of coal, rock and gas, the deformation and fracture development of the overlying strata after mining under the protective layer is simulated by using the numerical simulation software RFPA2D, and the law of gas migration under pressure is obtained, and then the theory of gas drainage under pressure is used. Combined with the field practice of 1551Q1) fully mechanized caving face in Panyi Coal Mine, this paper analyzes the application of the mining of the lower protective layer and the technique of drilling and pumping from the bottom drawing roadway up to the perforating layer. Surface drilling drainage technology combined with layout to extract remote protected layer pressure relief gas. It is obtained that the first mining of protection layer 11-2 coal can cause deformation and movement of overburden strata, and then produce "pressure relief and flow increase effect". Using the law of strata movement to select reasonable and effective gas extraction method can improve the gas drainage efficiency. The concentration of gas extraction is very good. Based on the field test of underground protective layer in Panyi Mine, the maximum expansion deformation of 13-1 coal seam is 210.5mm, the maximum expansion deformation rate is 42.1 鈥，

本文编号：1835856