大直径超长钻孔灌注桩静载试验分析  

Static load test and analysis of large diameter super long bored piles

作　　者：王学峰 李翱翔 侯爵 李亚雄 王振民 Wang Xuefeng;Li Aoxiang;Hou Jue;Li Yaxiong;Wang Zhenmin(China Construction Sixth Engineering Bureau Corp.,Ltd.,Tianjin 300171,China)

机构地区：[1]中国建筑第六工程局有限公司,天津300171

出　　处：《山西建筑》2025年第8期58-62,共5页Shanxi Architecture

基　　金：中国建筑股份有限公司科研课题(课题编号:CSCEC-2022-Z-25);中国建筑第六工程局有限公司科研课题(课题编号:CSCEC6B-2021-Z-5)。

摘　　要：对黄河中下游平原濮阳段黄河滩区粉细砂地层中3根长大桩基开展现场竖向静载试验,分析了试验数据和相关曲线,并与设计阶段勘察推荐值进行对比。结果表明:在密实的粉细砂地层中,大直径超长灌注桩呈现纯摩擦桩特征,桩身压缩回弹率36.7%~40.9%;粉质黏土、粉土地层中桩土相对位移分别达到5 mm~7 mm、不小于6 mm时,侧摩阻力基本可认为达到极限,而细砂地层中离散性较大,集中在3 mm~11 mm,甚至有尚需更大位移的趋势;计算长大桩基承载力时应对勘察推荐参数乘以1.1~1.7不等的修正系数。On-site vertical static load test is carried out on three long piles in powdery sand stratum in the Yellow River beach area of Puyang section of the middle and lower Yellow River plain,and the test data and relevant curves are analysed and compared with the values recommended by the investigation at the design stage.The results show that:in the dense fine sand stratum,the large-diameter super-long grouted piles present the characteristics of pure friction piles,with the compression rebound rate of pile body ranging from 36.7%to 40.9%;the relative displacement of pile-soil in the pulverised clay and pulverised ground stratum reaches the range of 5 mm~7 mm and not less than 6mm respectively,the lateral friction resistance can be regarded as reaching the limit basically,and in the fine sand stratum the dispersion is larger,concentrating in the range of 3 mm~11 mm,and there is even a the tendency of larger displacement is still needed;when calculating the bearing capacity of long pile foundation,the recommended parameters of investigation should be multiplied by the correction coefficient ranging from 1.1 to 1.7.

关 键 词：长大桩基 静载试验 桩身轴力 桩身侧摩阻力 桩土相对位移 

分 类 号：TU473.1[建筑科学—结构工程]