LeakageInduced Ground and Tunnel Response Considering the Effect of Grouting

Abstract:

The effect of grouting on tunnel leakage was studied in terms of the leakageinduced settlements of ground and tunnel, and the convergence and internal forces of tunnel, using FEM simulation. Based on the numerical results, a dimensionless parameter R integrating the permeability and geometry of grouting and tunnel lining was suggested to study the effect of grouting. Using this parameter, the effect of grouting on tunnel leakage can be predicted. Moreover, the permeability state of fully impermeable, infinite permeable and fully permeable could be defined in terms of the values of R. The numerical simulation indicates that the leakageinduced internal forces is negligible and may not affect the tunnel safety from the point of view of tunnel bearing capacity

Key words:clay; shield tunnel; tunnel leakage; grouting