ABSTRACT
This paper presents results of centrifuge tests investigating existing underground structures in a clay subjected to construction disturbance. A modelling technique was developed to simulate the failure of an excavation face in the ongoing construction. The effect of water was also simulated after the failure of the excavation. Deformations of the existing underground structures were measured by image analysis through tracing markers in the soil model. The centrifuge tests indicated that significant deformation developed in the soft clay resulted in great settlements of existing underground structures and bending of the existing tunnel. The maximum measured settlement of the existing tunnel was about 18% of tunnel diameter. The maximum settlements of the basement was 27.5% of tunnel diameter.
