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- W2384693373 abstract "During the grouting borehole drilling operation process in Yangcun Mine,in order to solve the drilling jammed and drilling tools buried problems due to the borehole falling in the weathered zone of the borehole,the surface pre-grouting construction design was optimized and the length of the second group casing pipe was extended to bellow the weathered zone.When the second group boreholes in the mine main shaft and the mine ventilation shaft completed with the drilling and grouting operations,the directional drilling was applied to complete the grouting borehole drillings below the first group boreholes to by pass the broken zone.The construction results showed that after the design optimized,the borehole drilling operation of the surface pre-grouting for the three mine shafts would completely avoid the weathered zone and could fundamentally solve the borehole falling problem of the grouting boreholes.Thus the drilling accidents had been avoided and the surface pre-grouting project of the mine shaft had been reduced by 4 months." @default.
- W2384693373 created "2016-06-24" @default.
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- W2384693373 date "2009-01-01" @default.
- W2384693373 modified "2023-09-23" @default.
- W2384693373 title "Optimization of Construction Design for Surface Pre-grouting Project of Mine Shaft in Yangcun Mine" @default.
- W2384693373 hasPublicationYear "2009" @default.
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