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Grouting and plugging technology for high-pressure fissure water inflow in ultra-deep vertical shaft and its risk control

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  • Laizhou Huijin Mining Investment Co.,Ltd.|Laizhou Huijin Mining Investment Co.,Ltd.|Laizhou Huijin Mining Investment Co.,Ltd.|Laizhou Huijin Mining Investment Co.,Ltd.|Changchun Gold Design Institute Co.,Ltd.
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Abstract:

In view of the engineering background that the ultra-deep main shaft of Shaling Gold Mine crosses an aquifer with high osmotic water pressure and large amount of water flush in single hole,a water control plan integrating pre-grouting,water plugging,and risk control at the working face is proposed.According to the hydrogeological data of ground investigation,the rock in the section of shaft depth 1 089.00-1 477.53 m is hard,high-angle fissures are relatively developed (mostly torsional,pressure torsional),and the overall permeability and water-richness are weak,and the fissure water is unevenly distributed and poorly connected.When the vertical shaft sinks to a vertical depth of 1 214 m,to ensure a smooth and safe path through the aquifer,a whole-section sectioned approach type,step-by-step grouting scheme was used for water plugging and reinforcement.The geological conditions of the aquifer,grouting reinforcement mechanism,design of key grouting parameters (grouting materials,rock plug thickness,grouting pressure),and feedback of the grouting effect are introduced in detail.On this basis,the source of the potential hazard during the construction period of grouting at the working face of great burial depth in the ultra-deep vertical shaft is analyzed,and the corresponding risk control measures are proposed,which can provide references for similar projects.

Keywords:

ultra-deep vertical shaft;high-pressure fissure water inflow;pre-grouting into working face;water plugging;risk control