Abstract:

The TBMbored Lingnan Tunnel of Hanjiang RiverWeihe River Water Conveyance Project crosses high pressure and waterrich fractured zones; and highpressure water inrush is serious during TBM construction. As a result, the fissure radial grouting technology, i.e. grouting diffluence + surface caulking + shallow plugging + deep reinforcement, is put forward. By adopting the radial grouting technology and new type of grouting material, the high pressure water inrush from the fissure has been effectively controlled and stopped. The calculation formulas for crack width, grouting volume and grouting pressure and control standards for grouting process are provided by taking the water inrush situation of Lingnan Tunnel for example. The application result of the technology, the water inrush volume of 7 800 m3/d （original one of 46 000 m3/d）, indicates that the technology adopted is effective. The results can provide reference for radial grouting of similar highpressure waterrich fractured ground.

Key words: hard rock ground, high pressure waterrich fractured zone, TBM construction, water inrush, radial grouting