公路边坡施工过程中桩板式挡土墙受力变形特征计算分析  

Calculation and Analysis of Stress and Deformation Characteristics of Pile-Plate Retaining Wall during Highway Slope Construction

作　　者：赵岩 Zhao Yan(China Railway 18th Group Fifth Engineering Co.,Ltd.,Tianjin 300450,China)

机构地区：[1]中铁十八局集团第五工程有限公司,天津300450

出　　处：《市政技术》2024年第9期90-95,134,共7页Journal of Municipal Technology

摘　　要：基于有限元软件Midas GTS NX,对公路边坡施工过程中桩板式挡土墙受力变形情况进行数值计算,查明了边坡填筑过程中桩板式挡土墙受力变形特征。结果表明:桩板墙桩身水平位移随着距桩顶距离的增大而减小,其悬臂段的变化幅度大于锚固段,桩顶水平位移随着边坡填筑高度的增加而增大;边坡填筑完成后,桩板墙桩身整体呈受压状态,随着距桩顶距离的增大,轴力先增大后减小;悬臂段剪力随着距桩顶距离的增大呈S形变化,最大值出现在锚固段与悬臂段交界处,锚固段上部剪力变化幅度不大,下部剪力变化幅度随边坡填筑高度的增加而增大;悬臂段上部的弯矩随着距桩顶距离的增大呈先增大后减小的变化规律,接近地面时,弯矩急剧变化,并在锚固段呈S形变化,最大值出现在悬臂段与锚固段交界处;在边坡填筑高度较低时,悬臂段桩身弯矩为0,锚固段随边坡填筑高度的增加逐渐由左侧受压转变为左侧受拉。The stress and deformation of the pile-plate retaining wall in the construction process of highway slope is numerically calculated,and the stress and deformation characteristics of the pile-plate retaining wall are found out by the finite element software Midas GTS NX.The results show that the horizontal displacement of the sheet-pile wall pile body decreases with the increase of the distance from the pile top.The variation range of the cantilever section is greater than that of the anchorage section.And the horizontal displacement of the pile top increases with the increase of the filling height;After the pile filling,the pile body is in a state of compression.And the axial force increases first and then decreases with the increase of the distance from the pile top;With the increase of the distance from the pile top,the shear force of cantilever section changes in S-shape,and the maximum value occurs at the junction of the anchor and the cantilever sections.The shear force of the front section of the anchor section changes little,and the shear force of the back section increases with the increase of the filling height;The bending moment increases first and then decreases in the upper part of the cantilever section with the increase of the distance from the pile top,and changes sharply when it is close to the ground.In the anchorage section,it shows S-shaped variation with the maximum value at the junction between the cantilever and the anchorage sections;When the filling height is lower,the bending moment of the cantilever section is zero.The bending moment of the anchorage section gradually changes from left compression to left tension with the increase of filling height.

关 键 词：公路 边坡 桩板式挡土墙 轴力 剪力 弯矩 

分 类 号：TU476.4[建筑科学—结构工程]