李嘴孜矿掏穴钻孔预抽瓦斯技术研究

发布时间：2018-04-30 15:02

本文选题：预抽瓦斯 + 掏穴钻孔　；参考：《安徽理工大学》2015年硕士论文

【摘要】：本文针对李嘴孜矿A1煤层透气性差、瓦斯难以抽放等问题开展掏穴钻孔预抽瓦斯技术的研究。以淮南矿业集团李嘴孜煤矿A1煤层为试验对象。首先从理论上分析了瓦斯在煤层中运移的基本规律、瓦斯在煤层中流动的基本参数与瓦斯在煤层中的流动状态。然后,在试验现场测出了李嘴孜煤矿A1煤层瓦斯的基础参数：煤层原始瓦斯最大压力为1.995Mpa,原始瓦斯含量为6.753m3/t,透气性系数为0.055963m2/MPa2.d,瓦斯流量衰减系数0.0357dq。在采用瓦斯压力降低法在现场对掏穴扩孔前后钻孔的抽采影响范围进行了测试,抽采影响半径由掏穴前的3.81m到掏穴后的4.32m,根据得到的抽采半径对钻孔进行优化布置：将A1煤层钻孔布置由4mx4m优化为6mx6m网格化进行,这样既减少了钻孔的施工量,又提高了瓦斯抽放效率。最后对李嘴孜矿A1煤层掏穴钻孔预抽瓦斯的消突效果进行了考察验证,进行了煤层残余瓦斯压力和残余瓦斯含量的测定,结果为：残余瓦斯压力0.54MPa,残余瓦斯含量1.35m3/t,且均低于《防治煤与瓦斯突出规定》中的临界值,证明了掏穴钻孔预抽瓦斯有良好的消突效果,能够保证矿井的安全高效生产,并为后期煤巷的掘进提供了保障。
[Abstract]:Aiming at the problems of poor gas permeability and difficult gas drainage in coal seam A1 of Lizuizhi Coal Mine, this paper studies the pre-drainage technology of drilling holes. Taking A 1 coal seam of Lizuizze Coal Mine of Huainan Mining Group as test object. Firstly, the basic law of gas migration in coal seam, the basic parameters of gas flowing in coal seam and the flow state of gas in coal seam are analyzed theoretically. Then, the basic parameters of A1 coal seam gas in Lizuizi coal mine were measured: the maximum gas pressure of the coal seam was 1.995Mpa. the original gas content was 6.753m3 / t, the permeability coefficient was 0.055963m2 / MPa2.dand the gas flow attenuation coefficient was 0.0357dq. In this paper, the influence range of borehole extraction before and after hole opening is tested by gas pressure reduction method in the field. The influence radius of extraction is from 3.81 m before extraction to 4.32 m after caving. According to the obtained extraction radius, the borehole layout is optimized from 4mx4m to 6mx6m in A1 coal seam, which not only reduces the construction amount of borehole, but also reduces the construction capacity of borehole. The efficiency of gas drainage is improved. Finally, the outburst suppression effect of pre-drainage in A _ 1 coal seam in Lizuizi Coal Mine is investigated and verified, and the residual gas pressure and residual gas content in coal seam are measured. The results are as follows: the residual gas pressure is 0.54 MPA, the residual gas content is 1.35 m3 / t, and is lower than the critical value in the regulation of prevention and control of coal and gas outburst, which proves that the pre-drainage of gas by drilling holes has good outburst suppression effect and can ensure the safe and efficient production of the mine. And for the later coal roadway excavation provided a guarantee.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD712.6

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