MECHANISM OF GROUND DEFORMATION DUE TO TAIL VOID OF SHIELD IN SOFT CLAY OBSERVED IN FIELD AND CENTRIFUGE MODEL

Abstract

An attempt was made to examine the mechanism of ground deformation due to tail void formation in shield tunneling in soft clay by using a series of centrifuge model tests, in which the reproduction of stress-strain characteristics and boundary conditions is possible. After confirming the repeatability and reliability of the model test data, the mechanism of ground deformation was deduced from the data of ground displacements, pore pressures and earth pressures on lining. It was shown that the ground deformation mechanism can be well explained by newly defined three phases