VARIATION OF THE LOAD ACTING ON ESTABLISHED SHIELD TUNNEL LINING INDUCED BY SETTLEMENT DUE TO CONSOLIDATION OF GROUND

Abstract

The attempt was made to examine the changing of long-term load acting on established shield tunnel lining in soft clay ground, by using a series of centrifuge model tests, in which assumed that it was the influence by consolidation. Consequently, the changing of long-term load could not only be occurred by the condition of bottom drainage (which is well-known Marston-Spangler model), which considered from the former, and also it could be occurred by the condition of tunnel drainage. And, it was shown that deformation of the ground being controlled by existence of a tunnel and the stress in the ground being redistributed has caused the long-term load changing action.