Stage-by-stage control effect field analysis of steel material servo enhanced support system on lateral displacement and bending moment during deep basement excavation

This study enumerates the stage-by-stage usefulness of the addition of a servo system to the lateral steel support system to improve the lateral load resistance of steel support members on an actual deep excavation site. A field case is found in a project of Triumph Unit building block, where a 14.20 m basement is constructed near the existing high traffic highway and high-rise buildings. It is therefore important to choose an appropriate excavation pit lateral support system to ensure the safety during excavation. At the field site, the basement execution works are divided into 5 construction stages. The excavated pit wall displacement and bending moment caused by excavation process are controlled using the steel material servo combined load support at each respective construction stage. The results from field work authenticate the steel servo enhanced support system application on an actual basement construction site. With the application of steel servo enhanced axial loading capacities, the excavated pit induced lateral displacement and bending moment are effectively restrained within the project acceptable alert limits. Moreover, the obtained field results correlate well with previous and current numerical literature data. This study provides a unique chance to advance the steel material servo enhanced support system application to actual deep basement projects with acceptable displacement and bending moment control requirements.