Study on Evaluation Method of Construction Safety Resilience of Deep Excavation with Pile-Anchor Supporting Structure

As progressive collapse incidents in deep excavation projects under complex conditions have become increasingly frequent, enhancing the resilience of deep excavations has become an important direction for future engineering practice. This study explores and proposes a dynamic quantitative method for assessing the construction safety resilience of deep excavations supported by pile-anchor systems. Based on the stress and deformation characteristics of pile-anchor-supported deep excavations during construction, the robustness and recoverability of the excavation system are analyzed, and the evolution of its construction-stage safety performance curve under construction-induced disturbance is characterized. The ratio of post-disturbance residual safety performance to undisturbed safety performance is adopted as the system resilience metric, and a quantitative formulation for construction safety resilience is established. Four monitoring indicators are selected for pile-anchor-supported deep excavations, and their weights are determined using the CRITIC method. Sensitivity analysis is further conducted for the indicator weights. A model for calculating residual safety performance during construction is developed, followed by a two-level resilience assessment method for individual monitoring sections and the entire excavation. Practical cases involving single-row and multi-row anchor systems are comparatively analyzed. These case studies are used to explore the dynamic assessment method for construction safety resilience. The proposed method may have potential for future engineering application and may provide a reference for the green construction of similar projects.