考虑材料劣化作用的桥梁桩基沉降和承载力变化研究  

Durability Study on Bearing Characteristics of Bridge Pile Foundations Considering Deterioration

作　　者：刘志刚[1] LIU Zhigang(China Railway 18th Bureau Group First Engineering Co.,Ltd.,Zhuozhou,Hebei 072750)

机构地区：[1]中铁十八局集团第一工程有限公司,河北涿州072750

出　　处：《河北建筑工程学院学报》2024年第4期39-44,共6页Journal of Hebei Institute of Architecture and Civil Engineering

摘　　要：桩基础作为桥梁的重要结构,不断被河流冲刷导致劣化,严重影响桥梁桩基的承载力和沉降速率。为此,研究桥梁桩基在材料劣化作用下承载力和桩基沉降的变化规律至关重要。以福建某跨河大桥为研究对象,通过数值模拟软件模拟桥梁桩基材料劣化过程,探究材料劣化作用下桥梁桩基沉降和承载力随桥梁服役时间的变化规律,对比钢筋劣化、混凝土劣化以及共同劣化下桥梁桩基沉降和承载力变化情况。研究表明,水流作用会降低桩侧摩阻力和桩端阻力,导致桩的服役年限缩短;考虑钢筋混凝土劣化时,钢筋锈蚀对桥梁桩基沉降及承载力变化影响较小,但混凝土劣化使桩基承载力影响较大,桩基沉降速率加快。研究结果可为材料劣化后桩基加固工作提供参考依据。As an important structure of bridges,pile foundations are constantly eroded by rivers,leading to deterioration,seriously affecting the bearing characteristics and durability of bridge pile foundations.Therefore,it is crucial to study the changes in bearing characteristics of bridge pile foundations under deterioration.This article takes a river crossing bridge in Fujian as the research object,and uses numerical simulation software to simulate the deterioration process of bridge pile foundation.It explores the changes in settlement and bearing capacity of bridge pile foundation under material degradation with the service time of the bridge,and compares the bearing characteristics and durability changes of bridge pile foundation under steel deterioration,concrete deterioration,and joint deterioration.Research has shown that the action of water flow can reduce the side friction and end resistance of piles,leading to a shortened durability life of piles;When considering the deterioration of reinforced concrete,the corrosion of steel bars has little impact on the bridge pile foundation structure,but the deterioration of concrete weakens the vertical load bearing capacity of the pile foundation,directly reducing the durability of the pile foundation.The research results can provide a reference basis for the reinforcement of pile foundations after material degradation.

关 键 词：桥梁桩基 材料劣化 承载特性 耐久性 数值模拟 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]