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- W2367764192 abstract "In order to reduce the high coal dust density and serious coal wall spalling in the fully mechanized top coal caving mining face,according to the seam conditions with soft roof,coal and floor in Baiping Mine,the deep borehole water injection for dust control and the grouting for the coal wall reinforcement were conducted in the seam of the coal mining face.ZDY-3200 drilling rig was firstly applied to drill a water borehole with a depth of 60~80 m.ZBQ-6/2.5 mode drilling rig was applied about 6 m near the water injection borehole to drill a grouting borehole on the coal wall with a depth of 9 m.The MRB125/31.5 mode water injection pump was applied to the seam hydraulic fracturing with a pressure of 12~14 MPa and after the seam fracturing,an intermittent water injection with a pressure of 5~8 MPa were repeatedly conducted.The site application effect showed that the technology applied could make the seam water content increased from 4% to 5%~6% and the average dust content in the air returning gateway was reduced from 269 mg/m3 to 108 mg/m3.The coal wall spalling scope of the coal mining face was reduced from 50%~70% to 10%~30% and the spalling problem was effectively controlled." @default.
- W2367764192 created "2016-06-24" @default.
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- W2367764192 date "2012-01-01" @default.
- W2367764192 modified "2023-09-25" @default.
- W2367764192 title "Dust Prevention with Deep Borehole Water Injection and Spalling Prevention with Grouting in Unstable Seam with Soft Roof,Coal and Floor" @default.
- W2367764192 hasPublicationYear "2012" @default.
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