ABSTRACT
Significant compressive and tensile forces due to both ordinary and earthquake loads act on the foundations of ultrahigh-rise buildings with large aspect ratios, which are increasing in urban areas of Japan. A diaphragm wall foundation with an enlarged part has been developed to handle this issue; this is a diaphragm wall foundation with an increased width at a section of the foundation near the wall tip. It is important for the trench of diaphragm wall foundation to be stable in the construction process. The purpose of this study is to evaluate the trench stability for the diaphragm wall foundation with an enlarged part. The following studies were carried out to grasp this. 1) Centrifuge model tests to evaluate the trench stability of the diaphragm wall foundation with an enlarged part. 2) Numerical simulation using a shear strength reduction FEM to simulate the centrifuge model tests.
