摘要
结合某库区桥梁偏位抢险工程,采用有限元分析软件ABAQUS建立三维岸坡-墩桩模型,考虑岸坡土体工程性质在水位周期性变幅作用下的劣化效应,分析岸坡与墩桩相互作用后墩桩的受力变形特征及水位周期性变幅作用下墩桩的位移和应力变化规律。结果表明:水位周期性变幅引起的岸坡滑动是导致桥墩产生较大偏移的重要因素,桥墩的偏移程度主要由墩桩X方向(土体滑动方向)的位移决定;水位周期性变幅主要对墩桩X方向的位移和桩身Y方向(平行岸边方向)的应力产生较大影响,最大位移出现在墩顶处,最大应力出现在桩身岩土交界面附近;随着水位周期性变幅次数的累积,墩顶位移和岩土交界面处的桩身应力均呈现“缓慢增长—较快增长—迅速增长”的变化规律。
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 evolution pattern:“slow increase-moderate increase-rapid increase”.
作者
曾树林
陈科
李亚飞
孙友为
郑杰
王小强
ZENG Shulin;CHEN Ke;LI Yafei;SUN Youwei;ZHENG Jie;WANG Xiaoqiang(China Construction Seventh Engineering Division Corp.,Ltd.,Zhengzhou 450004,China)
出处
《现代交通技术》
2026年第1期29-33,49,共6页
Modern Transportation Technology
关键词
库区水位
周期性变幅
库区桥梁
岸坡墩桩
变形特征
应力特征
reservoir water level
periodic fluctuation
bridge in reservoir area
bank-slope pier-pile
deformation characteristics
stress characteristics
