Abstract:

Xiapu tunnel crosses several waterrich fault and fracture zones. In order to cope with the fault and fracture zones, measures such as advance grouting, grouting through advance small ducts, grouting from the inclined shaft, support by tough wiremesh and shotcrete and radial grouting are taken. The monitoring results indicate that the settlement and the horizontal deformation of the tunnel agree with the deformation rule of exponential function, most of the deformation occurs within 20 days after excavation, the crown settlement is greater than the horizontal convergence and the crown settlement is the key controlling point of the project.

Key words: Xiapu tunnel, fault and fracture zone, advance grouting, tough wiremesh support