Abstract
To design an adequate reinforcement for an aged shield tunnel constructed in soft ground, it is important to predict precisely the future load increase, when the consolidation of the surrounding ground is proceeding with water leakage into the tunnel. However, the specification of the reinforcement could be designed overengineered with the conventional method, because the load increase is calculated with assumption that the maximum water leakage should be happening since the construction of this tunnel. In this paper, a method to predict future load increase appropriately is devised, using the water leakage condition of a tunnel and the change of inner displacement, and the validity of this method is discussed by using the field measurement results.
