<p>Soil arching that is generated and develops behind the retaining wall in a multistrutted excavation is a soil stress transfer process related to the relative movement between the well-retained soil mass and the inward-moved soil mass. Excavation induces stress release, which becomes highly complex under the arching effect, in the soil behind the wall. Determining such soil stress redistribution requires relatively higher computational capabilities. In this paper, a stress modulus attenuation model for soils behind flexible retaining walls in soft soil regions considering the soil arching effect is developed based on multiple field case studies of deep excavations. The proposed model features low computational cost, making it highly practical for engineering applications. Three detailed case studies are presented, where the proposed model is validated using the field-measured data or numerical result including variations in earth pressure acting on the retaining wall and changes in shear wave velocity of the retained soil. This study improves the understanding of soil stress redistribution induced by soil arching during excavation, and the proposed model can assist in optimizing the design of retaining structures and rapidly assessing the impact of excavations on the surrounding environment.</p>