库区水位周期性变幅对岩土边坡桥墩的长期影响研究OA

Based on a bridge displacement emergency in a reservoir area,a three-dimensional slope-pier-pile model was established using the finite element analysis software ABAQUS.Considering the degradation of soil engineering properties under periodic fluctuations in reservoir water levels,the mechanical behavior and deformation characteristics of the pier under slope-pier interaction were analyzed,as well as the displacement and stress variation laws of the pier under periodic fluctuations in reservoir water levels.The results indicate that slope sliding induced by periodic water level fluctuations is the primary cause of significant pier displacement,and the magnitude of displacement is mainly determined by the X-direction displacement of the pier-pile system.Periodic water level fluctuations have a significant effect on the X-direction displacement of the pier-pile system and the Y-direction stress of the pile shaft,with maximum displacement occurring at the pier top and peak stress appearing near the soil-rock interface.With the accumulation of periodic water level fluctuations,both the pier top displacement and the pile stress at the soil-rock interface exhibit a three-stage evolu-tion pattern:"slow increase-moderate increase-rapid increase".