Abstract
Based on the characteristics of high water pressure and large quantity water-inrush in water-rich dolomite formation around the 1000m level blind shaft of a mine in Yunnan province, pre-grouting was proposed to control water for safe and rapid tunneling. Three large chambers were set up as drilling platforms underground, and the pulping station was established on the surface, the red clay cement slurry was transported to underground grouting station through slurry pipeline. 496m long grouting section was designed and segmented downward manner was adopted. After pre-grouting, the water inflow in the pre-grouting section of the shaft is 7.86m3/h, which met the requirements of the national standard and the contracted maximum water inflow 10m3/h, excellent water control effect was obtained. scientific and reasonable pre-grouting design achieved safe and rapid tunneling of the 1000m level blind shaft.
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