Despite the growing popularity of diaphragm walls, there is still a lack of understanding regarding soil-concrete interaction and nonlinear behavior analysis for combining the soil and concrete part, which hinders the optimization of reinforced concrete design. This study aims to fill that gap by refining reinforced concrete design and ensuring structural integrity during construction without compromise the safety philosophy. The primary objectives are to enhance the efficiency, reliability, and sustainability of diaphragm walls through a thorough analysis of soil-concrete interactions and nonlinear behaviors.