超长大直径钻孔桩基础现场压缩静载荷测试分析  

In-situ Compressive Static Load Test Analysis of Super Long and Large Diameter Drlled Pile Foundation

作　　者：王润青 Wang Runqing(Beijing Beipai Construction Co.Ltd.,Beijing 100022)

机构地区：[1]北京北排建设有限公司,北京100022

出　　处：《江西建材》2024年第4期101-103,共3页

摘　　要：文中以某桥梁工程为例,对静载作用下不同类型桩的沉降量时程响应曲线以及荷载随深度的传递机制进行分析。结果表明,相同荷载水平下,2号桩的沉降量与1号桩相比降低了55.3%~67.8%。所有荷载水平下,钻孔灌注桩的桩身轴力随着深度的增加呈现不断下降的趋势。相同荷载条件下,钻孔灌注桩的桩身轴力略高于1号桩的桩身轴力,最大荷载水平下,2号桩的桩端部支撑百分比高于1号桩的端部支撑百分比。随着施加荷载水平的增加,钻孔灌注桩的桩侧摩阻力呈现先快速增加后平稳的趋势。相同荷载水平下,2号桩的桩侧摩阻力大于1号桩的桩侧摩阻力。总之,桩越长,钻孔灌注桩的承载能力越强。Taking a bridge project as an example,the time-history response curve of settlement of different types of piles under static load and the mechanism of load transfer with depth are analyzed in this paper.The results show that the settlement of pile No.2 under the same load level is reduced by 55.3%~67.8%compared with pile No.1.Under all load levels,the axial force of bored pile decreases with increasing depth.Under the same load level,the axial force of bored pile is slightly higher than that of pile No.1,and the supporting percentage of pile end of pile No.2 is higher than that of pile No.1 under maximum load level.With the increase of applied load level,the lateral friction resist-ance of bored pile increases rapidly at first and then becomes stable.Under the same load level,the side friction resistance of pile No.2 is greater than that of pile No.1.In short,the longer the pile,the stronger the bearing capacity of the bored pile.

关 键 词：基坑工程 大直径钻孔桩 现场压缩 静载测试 沉降量 轴力 

分 类 号：U195[交通运输工程]