复杂土层条件下堆载对邻近桥梁桩基受力变形的影响及控制研究  

A Study of the Influence and Control of Pile Loading on the Deformation of Adjacent Bridge Piles Under Complex Soil Layer Conditions

作　　者：刘小林 LIU Xiao-lin(China Railway 18th Bureau Group Fifth Engineering Co Ltd,Tianjin 300459,China)

机构地区：[1]中铁十八局集团第五工程有限公司,天津300459

出　　处：《五邑大学学报（自然科学版）》2023年第1期71-78,共8页Journal of Wuyi University(Natural Science Edition)

摘　　要：为探讨不同形式堆载作用下多层土体地基桥梁桩基的稳定性状况,基于Midas GTS NX软件建立了不同堆载工况下含桥梁桩基的地基计算模型,分析了堆载的宽度、高度和位置对桩基水平和竖向变形、轴力、剪力和弯矩分布的影响.结果表明:桩基水平位移随深度增加先增大后降低,最大剪力随桩基埋深和堆载宽度的增加而增大,最大水平位移和弯矩均随堆载宽度呈指数型增长,且出现位置向深部转移.桩基最大水平位移和最大弯矩随堆载高度增加分别呈现指数型和线性增长,随堆载距离增加分别呈线性和指数型降低,最大正弯矩出现在土-岩交界处,且左桩基水平位移和弯矩大于右桩基.研究结果可为多层土体地基中堆载参数合理选择和桥梁桩基加固等提供理论支撑.In order to explore the stability of bridge pile foundation in multi-layer soil foundations under different pile loads, a foundation calculation model with bridge pile foundation under different pile loads was established based on the Midas GTS NX software, and the effects of pile width, height and distance on horizontal and vertical deformation, axial force/shear force and bending moment distribution of pile foundation were analyzed. The results show that the horizontal displacement of pile foundation increases first and then decreases with the increase of pile depth, the maximum shear increases with the increase of pile depth and load width, and the maximum horizontal displacement and bending moment increase exponentially with load width, and the position shifts to the depth. The maximum horizontal displacement and maximum bending moment of pile foundation increase exponentially and linearly with the increase of pile height, and decrease linearly and exponentially with the increase of pile distance. The maximum positive bending moment occurs at the soil-rock junction, and the horizontal displacement and bending moment of the left pile foundation are greater than those of the right pile foundation. The research results can provide theoretical support for reasonable selection of load parameters in a multi-layer soil foundation and bridge pile foundation reinforcement.

关 键 词：多层土体地基 桥梁桩基 堆载 变形及受力分析 稳定性 

分 类 号：U441[建筑科学—桥梁与隧道工程]