摘要
利用ABAQUS对基坑开挖与邻近支盘桩进行有限元模拟。改变基坑开挖深度和桩距离基坑的间距,研究在竖向荷载下基坑开挖对邻近支盘桩桩身轴力、弯矩和水平位移的影响,并与同直径等截面普通桩进行对比分析。结果表明:支盘桩桩身轴力在每个承力盘的上端至下端急剧下降,弯矩分布均匀,出现多个极值;随着开挖深度的增加,支盘桩的轴力和弯矩不断增大,和同直径等截面普通桩相比,桩顶轴力和最大弯矩基本相同,但桩底轴力相差较大,水平位移在趋势和数值上无明显区别;随着支盘桩距离基坑间距的增加,桩身轴力不断减小,和同直径等截面普通桩相比,间距越大轴力变化幅度越小。
In this paper,the finite element simulation of foundation pit excavation and adjacent branch piles is carried out by Abaqus.By changing the depth of foundation pit excavation and the distance between piles and foundation pit,the influence of foundation pit excavation on the axial force,bending moment and horizontal displacement of adjacent branch piles under vertical load is studied and compared with ordinary piles with the same diameter and equal cross-section.The results show that the axial force of branch pile decreases sharply from the upper end to the lower end of each bearing plate,the bending moment is uniformly distributed,and several extreme values appear,and the axial force and bending moment of branch pile increase with the increase of excavation depth.Compared with ordinary piles with the same diameter and equal cross-section,the axial force at the top of the pile and the maximum bending moment are basically the same,but the axial force at the bottom of the pile is quite different,and there is no obvious difference in trend and value of horizontal displacement.With the increase of the distance between the branch pile and the foundation pit,the axial force of the pile decreases continuously.Compared with the ordinary pile with the same diameter,the larger the distance is,the smaller the variation of the axial force is.
作者
柳威振
冯亚伟
侯晋杰
Liu Weizhen;Feng Yawei;Hou Jinjie(Shanxi Academy of Building Sciences Group Co.,Ltd.,Taiyuan Shanxi 030001,China)
出处
《山西建筑》
2024年第11期90-92,159,共4页
Shanxi Architecture
关键词
基坑开挖
支盘桩
三维数值分析
foundation pit excavation
branch pile
three-dimensional numerical analysis
作者简介
柳威振(1993-),男,工程硕士,工程师,从事结构与检测鉴定工作。
