大直径钢管桩承载力时间效应现场试验研究  

Field test and study of time effect on ultimate bearing capacity of large diameter steel pipe pile

作　　者：钟世心 胡兴昊[2] 桑登峰[2] 王湛[2] 

机构地区：[1]中交四航局第二工程有限公司,广东广州510300 [2]中交四航工程研究院有限公司,广东广州510230

出　　处：《中国港湾建设》2016年第6期44-47,共4页China Harbour Engineering

摘　　要：依据深圳盐田港西作业区集装箱码头、珠海高栏港集装箱码头、福建罗源湾货运码头等工程中大量钢管桩的施工实践,结合现场相关资料,通过高应变动测试桩和静载试桩资料的统计、对比分析,对钢管桩承载力随时间变化的规律进行研究。通过对3个项目现场试验结果分析,大直径钢管桩的承载力恢复系数的取值范围大致为1.2~1.4之间。钢管桩承载力恢复系数与挤土效应明显的PHC桩相似,挤土效应并非是决定钢管桩承载力时效性的关键因素。持力层地质越好,沉桩时对桩端和桩侧土的强度影响较小,桩的承载力恢复系数越小。Based on a great deal of practice in construction with steel pipe piles in Shenzhen Yantian third phase containerterminal project, Zhuhai Gaolan container terminal project, and Fujian Luoyuan Bay freight terminal project. The rules ofdevelopment of the ultimate bearing capacity of steel pipe piles over time were studied with field data and the statistics andcontrast analysis of the results of high strain dynamic tests and static compression load tests. With an analysis of the field testresults of the three projects, the recovery coefficient for the bearing capacity of large diameter steel pipe piles is between 1.2and 1.4, which is similar to that of PHC piles with significant pushing effect. But the effect of pushing against soil is not the keyfactor deciding the time dependence of the bearing capacity of steel pipe piles. The better the bearing strata are, the smaller theinfluence of pile driving upon the strength of pile tips and soils around a pile is, and the smaller the recovery coefficient of thebearing capacity of a pile will be.

关 键 词：钢管桩 承载力 时间效应 高应变动测 恢复系数 

分 类 号：U655.544[交通运输工程—港口、海岸及近海工程]