艰险山区斜坡段挖井基础荷载传递特性分析  

Analysis of load transfer characteristics of digging well foundation in slope sections of difficult and dangerous mountain areas

作　　者：李增源 李世文 马泽理 江鑫 马少坤[3] 张加兵 LI Zengyuan;LI Shiwen;MA Zeli;JIANG Xin;MA Shaokun;ZHANG Jiabing(Guangxi Communications Investmen Group Co.,Ltd.,Nanning 530022,China;Guangxi Communications Design Group Co.,Ltd.,Nanning 530029,China;School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)

机构地区：[1]广西交通投资集团有限公司,广西南宁530022 [2]广西交通设计集团有限公司,广西南宁530029 [3]广西大学土木建筑工程学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2024年第4期714-725,共12页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金项目(52108367)。

摘　　要：针对目前艰险山区斜坡段挖井基础承载力传递特性研究严重滞后的现状,依托乐业至望谟高速公路运赖特大桥左幅10#挖井基础工程实际,通过建立考虑桥墩-挖井基础-岩土体耦合作用的三维有限元模型,探讨了水平荷载和竖向荷载共同作用下斜坡段挖井基础的荷载-位移关系、轴力传递机制以及侧壁摩阻力和基底接触压力的变化规律。结果表明,水平荷载施加会使挖井基础顶面沉降增大,但不同水平荷载对基础顶面沉降影响较小;基础深度和侧壁摩阻力对挖井基础的轴力传递影响较大,同时基础轴力在基础端部还会出现骤减现象;水平荷载在2/3 L深度范围内对侧摩阻力的影响较大;侧摩阻力呈现双峰型分布,在基础端部还会出现一定的应力隆起情况;侧壁接触压力存在2个峰值,分别位于基础顶面与0.93L处。In response to the current severe lag in research on the load-bearing characteristics of digging well foundation in slopes steep mountainous sections of difficult and dangerous mountain areas,this study is based on the actual engineering of the 10#digging well foundation of the left side of the Leye to Wangmo Expressway Yunlai Super Bridge.By establishing a three-dimensional finite element model that considers the coupling effect of bridge piers,digging well foundations,and rock-soil,the research explores the load-displacement relationship,axial force transmission mechanism,sidewall friction,and base contact pressure variations of digging well foundation in slope sections of difficult and dangerous mountain areas under the combined action of horizontal and vertical loads.The results indicate that the application of horizontal loads leads to increased settlement of digging well foundation s top surface,but different types of horizontal loads have a relatively small impact on the settlement of the top surface.Foundation depth and sidewall friction significantly affect the axial force transmission of digging well foundation,with a sudden decrease in axial force occurring at the base end.Horizontal loads have a significant impact on sidewall friction within a depth range of 2/3 L.Sidewall friction exhibits a bimodal distribution,with some stress uplift at the base end.There are two peak values of sidewall contact pressure,located at the foundation s top surface and at 0.93 L.

关 键 词：挖井基础 荷载传递特性 侧摩阻力 接触压力 

分 类 号：U442[建筑科学—桥梁与隧道工程]