近距离煤层群覆岩裂隙带瓦斯治理措施优化及效果分析  

Optimization and Effect Analysis of Gas Control Measures in Overlying Rock Fissure Zone of Contiguous Seam Group

作　　者：李德慧 LI Dehui(State Key Laboratory of Coal and Coalbed Methane Co-mining,Jincheng 048012,China;Jinneng Holding Equipment Manufacturing Group Co.,Ltd.,Jincheng 048000,China;Yi'an Lanyan Coal and Coalbed Methane Co-mining Technology Co.,Ltd.,Taiyuan 030031,China)

机构地区：[1]煤与煤层气共采国家重点实验室,山西晋城048012 [2]晋能控股装备制造集团有限公司,山西晋城048000 [3]易安蓝焰煤与煤层气共采技术有限责任公司,山西太原030031

出　　处：《煤》2024年第1期27-30,41,共5页Coal

基　　金：山西省重点研发计划项目(202202080301010);国家自然科学基金面上项目(52274014);山西省揭榜招标项目(20201101004);中国工程院院地合作项目(2020SX4)。

摘　　要：为解决近距离煤层群综采工作面回采中上隅角瓦斯治理难题,保障综采工作面有效衔接,实现连续安全高效生产,利用同位素测定分析技术明确了近距离煤层群卸压瓦斯涌入覆岩裂隙带内的规律特征,提出施工地面L型钻孔以优化原有的覆岩裂隙带瓦斯治理技术,降低综采工作面上隅角瓦斯体积分数。结果表明:屯兰矿2号煤层综采工作面的覆岩裂隙带高度附近,工作面自切眼回采的95 m范围内,02号煤卸压瓦斯抽采占比逐渐降低,2号和4号煤层的卸压瓦斯抽采占比逐渐升高,95 m后,02、2和4号煤卸压瓦斯抽采占比趋于稳定,占比分别为60%、25%和10%.优化后的“以孔代巷”技术“高位钻孔+低位钻孔+高位走向长钻孔+地面L型钻孔”将上隅角平均瓦斯体积分数由0.65%降低至0.25%.地面L型钻孔的施工在空间和时间上保障了井下综采工作面的连续稳定生产,对井下工程不形成干扰,有助于解决上隅角瓦斯超限问题,实现了综采工作面的安全高效连续生产。In order to solve the gas control problem in the middle and upper corner of the fully-mechanized mining face in the near seam group,ensure the effective connection of the fully-mechanized mining face,and realize continuous,safe and efficient production,the regularity and characteristics of the pressure relief gas pouring into the overlying rock fracture zone in the near seam group were defined by using the isotope measurement and analysis technology,and the L-shaped drilling of the ground was proposed to optimize the original gas control technology in the overlying rock fracture zone.Reduce the corner gas of fully-mechanized mining face.The results show that:near the height of the overlying rock fracture zone of the fully-mechanized mining face of No.2 coal seam in Tunlan Coal Mine,the ratio of depressurized gas extraction of No.02 coal gradually decreases,and the ratio of depressurized gas extraction of No.2 and No.4 coal seams gradually increases within the 95 m range of self-cutting mining of the working face.After 95 m,the ratio of depressurized gas extraction of No.02,No.2 and No.4 coal tends to stabilize.They accounted for 60%,25%and 10%respectively.The optimized technology of"high drilling+low drilling+high strike long drilling+surface L-shaped drilling"reduces the average gas concentration in the upper corner from 0.65%to 0.25%.The construction of L-shaped borehole on the surface ensures the continuous and stable production of the underground fully-mechanized mining face in space and time,and does not interfere with the underground engineering,which helps to solve the problem of excessive gas in the upper corner and realize the safe and efficient continuous production of the fully-mechanized mining face.

关 键 词：近距离 煤层群 采动卸压 覆岩裂隙带 上隅角 瓦斯 L型钻孔 效果分析 

分 类 号：TD712.6[矿业工程—矿井通风与安全]