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- W2354680764 abstract "This paper gives a description of the design thinking and key technique of bore-holes on the roof strike of the working face in Qinan Coal Mine. Taking No.3 and 4 holes at the first drilling site in the gate of No.1025 face as an example, the author made an emphatic investigation on the draiange effectiveness according to the gas concentration and gas flow in bore-holes, the horizontal distance from hole mouth to the working face, and the negative pressure for gas drainage and obtained the relation between them. The author pointed out that the drilling position of the hole is the key influence factor on the drainage effectiveness by holes on roof strike and the drainage effectiveness is the best when the end of the finished hole on the roof strike of No.1025 face is 16~20m away from the roof of No. seam." @default.
- W2354680764 created "2016-06-24" @default.
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- W2354680764 date "2003-01-01" @default.
- W2354680764 modified "2023-09-23" @default.
- W2354680764 title "Design of Bore-holes on Roof Strike in No.1025 Face and Investigation of Gas Drainage Effect n Qinan Mine" @default.
- W2354680764 hasPublicationYear "2003" @default.
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