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 the urban areas. A diaphragm wall foundation with enlarged parts has been developed to handle this issue. The field construction tests were carried out to examine the construction method of diaphragm wall foundation with enlarged parts. Prior to field construction tests, it was needed to evaluate the trench stability on the diaphragm wall foundation with enlarged parts of in-situ foundation model during the excavation process of foundation construction. Therefore, we conducted the field construction test after studying the numerical simulation of stability on the diaphragm wall foundation using the finite element method with shear strength reduction method. It is found that it is stable for the diaphragm wall foundation with enlarged parts from the numerical simulation results. After this simulation, field construction tests confirmed that with proper construction control this new diaphragm wall can be constructed in the required shape, dimensions, and quality.
