高陡坡区桥梁单桩基础横向承载及变形特性的数值模拟研究  

A Study on Numerical Simulation of Lateral Bearing and Deformation Characteristics of Monopile Foundation for Bridge in High Steep Slope Area

作　　者：冯忠居[1] 郭聪林 张亚军[1] FENG Zhong-ju;GUO Cong-lin;ZHANG Ya-jun(College of Highway,Chang'an University,Xi'an 710064,Shaanxi)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《商洛学院学报》2025年第2期66-72,共7页Journal of Shangluo University

基　　金：福建省交通运输科技项目(202105)。

摘　　要：为研究山区桥梁桩基横向承载力及变形特性,依托实体工程通过数值模拟研究不同坡度、桩长条件下桥梁桩基的横向承载及变形。结果表明,在横向荷载作用下,桩基的横向位移随荷载增加而不断增大,且增速加快,与此同时,桩基的H-y曲线趋于平缓,但尚未进入塑性变形阶段,表明桩基具有较强的抗变形能力和承载稳定性。随着坡度增加,桩基的水平容许承载力减小,而桩长增加能有效提升其水平承载力。桩长的增加增强了桩基的嵌入深度,这种嵌入深度的增强减小了桩身侧向变形。而坡度增加则减弱土体的侧向约束力,降低桩基稳定性,导致桩身变形增大。因此,在桩基设计过程中,必须充分考虑坡度和桩长对桩基性能的影响,合理优化设计参数,以提高桩基的承载能力和稳定性,从而确保其在复杂地形和负荷条件下的安全性。The present study investigates the lateral bearing capacity and deformation characteristics of pile foundations for bridges in mountainous areas.To this end,the lateral bearing capacity and deformation of bridge pile foundations under different slopes and pile lengths are investigated by numerical simulation.The numerical simulation is based on solid engineering.The findings indicate that the lateral displacement of pile foundations is contingent on the magnitude of lateral load.It has been observed that the growth rate of these foundations is enhanced under the influence of lateral load,leading to an acceleration in their growth rate.Furthermore,the H-y curve of pile foundations exhibits a propensity to flatten,thereby indicating an absence of plastic deformation.This behaviour is indicative of their high deformation resistance and bearing stability.In the context of slope-related conditions,it has been determined that the horizontal allowable bearing capacity of pile foundations experiences a decline with an increase in slope.However,the efficacy of pile length in enhancing its horizontal bearing capacity is noteworthy.It has been demonstrated that an augmentation in pile length engenders an enhancement in the embedment depth of the pile foundation,concomitantly reducing the lateral deformation of the pile body.Conversely,an increase in slope has been shown to weaken the lateral restraint force of the soil,decrease the stability of the pile foundation,and lead to an increase in the deformation of the pile body.Consequently,in the process of pile foundation design,the influence of slope and pile length on the performance of pile foundation must be thoroughly considered,and the design parameters must be reasonably optimised in order to enhance the bearing capacity and stability of the pile foundation.This is essential to ensure its safety under complex terrain and loading conditions.

关 键 词：桥梁桩基 高陡坡 数值模拟 横向承载特性 变形特性 

分 类 号：U443.1[建筑科学—桥梁与隧道工程]