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Approach to increasing the quality of pressure-relieved gas drained from protected coal seam using surface borehole and its industrial application

引用

International Journal of Coal Science & Technology 2015年第1期2卷 46-51页

作者： Yingke Liu Fubao Zhou Jianlong Wang Jun Liu School of Safety Engineering China University of Mining &Technology Xuzhou 221116 China State Key Laboratory of Coal Resources and Mine Safety China University of Mining & Technology Beijing 100083China

During mining of lower protective coal seam, a surface borehole can efficiently extract not only the pressure-relieved gas from the protected layer, but also the gas from the mining layer gob. If the distance between the borehole and gob is too large, the quantity of gas drained from the protected layer decreases substantially. To solve this problem, a mathematical model for extracting pressure-relieved gas from a protected coal seam using a surface borehole was established, based on the radial gas flow theory and law of conservation of energy. The key factors influencing the quantity of gas and the drainage flow network using a surface borehole were presented. The results show that the quantity of pressure-relieved gas drained from the protected layer can be significantly increased by increasing the flow resistance of the borehole bottom. Application of this method in the Wulan Coal Mine of the Shenhua Group significantly increased the flow of pure gas and the gas concentration （by factors of 1.8 and 2.0, respectively）, thus demonstrating the remarkable effects of this method.

关键词： surface borehole Gas drainage borehole bottom resistance Pressure-relieved gas

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Model on surface borehole squeezing deformation fracture

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Journal of Coal Science & Engineering(China) 2009年第3期15卷 304-307页

作者： SUN Hai-tao HU Qian-ting HUANG Sheng-shu Chongqing Research Institute China Coal Research Institute Chongqing 400037 China College of Civil Engineering Chongqing University Chongqing 400044 China

As a good method to solve the problem of high methane on the workface and inthe goaf,drawing coal strata methane through a surface borehole is ***,theexcavation affected the overlying rock strata *** the excavation face passedthrough the surface borehole position,the surface borehole fractures *** problemwas seriously related to the unformed squeeze ***,a squeezing deformationfracture model based on the rock strata squeezing effect was set *** the same time,a3DEC simulation model is presented to confirm the *** result shows that the modelis reliable and has a good engineering application value.

关键词： methane drawing surface borehole squeeze effect

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