2020 Volume 76 Issue 1 Pages 49-61
In the soft clay ground, a shield tunnel suffers from an additional load which is generated due to the consolidation of ground that is caused by the water leakage into the tunnel. Therefore, it is important to make precise prediction of additional load in a future, when designing reinforcement of the tunnel. In this paper, the change of the soft soil performance has been obtained by three dimensional fully coupled seepage-stress FEM analysis and the mechanism of generation of additional load has been demonstrated. The comparison has been made between the calculation result and the output of the previous two dimensional fully coupled seepage-stress FEM analysis. As a result, it was clearly shown that convergence value of additional load can be accurately calculated with the previous method by two dimensional FEM analysis.
