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| Application of water seepage grouting plugging technology in large buried depth and high water pressure shaft wall |
| Zhang Haibo |
| Xinjiang Xingmei Mining Industry Co., Ltd., Bayingolin Mongol Autonomous Prefecture 841000, China |
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Abstract Taking the 667.5 ~ 702.5 m section of the auxiliary shaft of No.1 Mine in Tashidian mining area as an example, the main shaft lining support method was plain concrete support. During the excavation period, the water inflow of this section was 30.2 m3/h, and the water pressure reached 6 MPa. By adopting the combination of ' internal plugging and external discharge ', that is, the hydrophobic depressurization drainage hole was constructed near the + 500 m level of the wellbore to drain and depressurize the water layer section of the lower wellbore of the auxiliary shaft. Combined with the grouting method of long and short holes in the wellbore wall, the lower wellbore wall of the auxiliary shaft was grouted to plug the water inflow of the wellbore wall. Through grouting and plugging, the water inflow of the auxiliary shaft was reduced to less than 10 m3/h, reaching 8.6 m3/h, and the application effect was good.
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