SIMULATION AND EVALUATION OF THE INTERACTION BETWEEN SLOPE EXCAVATION AND NEIGHBORING UNDERGROUND GRAIN SILO STRUCTURE

Understanding the interaction mechanisms between slope excavation and adjacent underground structures is critical for ensuring construction safety in complex geological environments. This study established a three-dimensional numerical model of a slope-underground grain-silo system using FLAC^3D software to investigate the coupled response during staged excavation. Five sequential unloading steps were simulated to capture progressive stability evolution and structural disturbance patterns. A characteristic parameter framework comprising six indicators was developed to quantitatively characterize soil-structure interaction. The results show that slope stability progressively degraded,with the stability factor decreasing from 1.36 to 1.02,exhibiting a depth-dependent response characterized by pronounced deep-zone deformation and upward attenuation. The grain silo demonstrated spatially heterogeneous responses: the roof emerged as the critical zone,with maximum strain increments reaching 20‰ and experiencing a stress-path transition from triaxial confinement to a"lateral unloading-vertical loading" state,while the main body maintained structural integrity. Stress-path analysis revealed that the slope-silo interaction was governed by load-transfer mechanisms,forming a"slope unloading-silo bearing" pattern. The proposed characteristic parameter system successfully captured system evolution,with key parameters identifying critical turning points during excavation stages. These findings elucidate the interaction mechanisms in slope-structure systems and provide practical tools for stability assessment and protective design in similar geotechnical projects.