In response to the delay in construction period caused by sudden water influx in deep buried TBM tunnels,this article proposes water blocking grouting treatment measures for different water output volumes.The plan first sets up longitudinal and circumferential water blocking curtains in the sudden water inflow area based on the water output,to prevent groundwater from extending and diffusing beyond the grouting section through the outlet cracks.Within the vertical and circumferential water blocking curtain sealing range,shallow sealing is carried out on areas without water and with small water,forming a grouting sealing area with a certain rock thickness.For areas with high water flow points,deep reinforcement holes should be arranged to prevent sudden water influx during the groundwater sealing stage from spreading to the surrounding areas through deep developed cracks,increasing the difficulty of sealing and cultivation.This method has been applied multiple times in engineering,and the engineering effect is evaluated by comparing the water output before and after water blocking grouting construction.The results indicate that the scheme has good water blocking effect,and the research results can provide reference for water blocking grouting in similar TBM tunnel projects.
deep buried TBM tunnelwater blocking groutingwater output
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