摘要
通过相似模拟实验、现场实测及理论计算等手段,对塔河煤矿11B801综放工作面高位瓦斯抽采钻孔参数展开研究。结果表明:11B801综放工作面回采过程中存在"大、小周期"来压现象,小周期平均来压步距约15. 5m,大周期平均来压步距约65. 0m,"大、小周期"与瓦斯运移通道及聚集场所的发育密切相关;基于"大、小周期"来压步距确定了高位钻孔有效抽采长度,并反推计算出钻孔孔深、仰角、压茬距等参数;通过对工作面回采过程中顶板来压及钻孔抽采浓度监测数据分析,验证了利用"大、小周期"来压步距反推计算钻孔参数的合理性,11B801综放工作面上隅角瓦斯浓度控制在0. 47%以下,保证了11B801综放工作面安全高效生产。
By means of similar simulation experiment,field measurement and theoretical calculation,the parameters of high level gas drainage borehole in 11B801 fully mechanized top coal caving face of Tahe Coal Mine are studied. The results show that there is a"large and small period"pressure phenomenon in the recovery process of 11B801 fully mechanized caving face.The small cycle average pressure step distance is about 15. 5 m,and the large period average pressure step distance is about 65. 0 m. The"large and small period"is closely related to the development of gas migration channel and the development of the gathering place. Based on the "big and small cycle ", the effective length of the high borehole is determined, and the parameters such as depth,elevation and stubble distance are calculated. Through the analysis of the monitoring data of roof pressure and drilling extraction concentration during the working face recovery,the reasonableness of calculating the drilling parameters with the back-stepping of the step distance of the "large and small period"was verified. The gas control of the upper corner of the 11B801 fully mechanized caving face was below 0. 47%,which ensured the safe and efficient production of the 11B801 fully mechanized caving face.
引文
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