Rapid Treatment of Significant Water Seepage at the Tunnel Face During TBM Construction of the Yellow River Diversion Tunnel

The tunnel has a total length of approximately 11 km and is constructed using a double-shield TBM (Tunnel Boring Machine). When the tunneling reached about 7 km, it encountered a fine sandstone confined aquifer. At the nine o'clock position of the tunnel face, three interconnected water-bearing fissures were identified, leading to significant water inflow. The water inflow rate was about 300 m³/h, with a water pressure of approximately 1 MPa. The substantial seepage posed a direct threat to the normal operation of the TBM, forcing it to halt excavation. After retreating one ring of segment, the construction team promptly adopted Renuo waterproofing material for grouting and sealing. This quickly restored TBM operation, allowing for smooth progress through the water-seepage section.