Impact of Neighbouring Excavation on Diaphragm Wall under Seismic Loading

The existing diaphragm walls may be affected by the new structure as well as any excavation work required for the surrounding projects. During an earthquake, this effect can be more pronounced. It is therefore, suggested to create the diaphragm wall and the neighbouring excavation models with the intention of researching the influence of excavation upon diaphragm wall under dynamic conditions. For the investigation, a case study involving a diaphragm wall located in Noida was taken into account. The diaphragm wall and nearby excavation were modelled utilizing the Plaxis 3D program. By altering the space between the excavation and the diaphragm wall and entering the time-history acceleration data from an earlier earthquake, it was possible to examine the impact of the nearby excavation for the new construction on the diaphragm wall under dynamic conditions. The outcomes of three-dimensional numerical analysis were compared. The study has revealed that the wall's horizontal displacement increases with increasing the space between the wall and the excavation until it arrives at an approximate value that resembles the wall's horizontal deflection without nearby excavation. Graphs of shear force and bending moment were also compared and similar variations were found.