跨海高速铁路桥梁超长钢管桩锤击沉桩机理探究  

Investigation on the Mechanism of Hammer Sinking of Extra-long Steel Pipe Piles for Cross-sea High-speed Railway Bridges

作　　者：钟庆华 李有为[2,3] 孙婉静 谢德宽 肖苡辀 ZHONG Qinghua;LI Youwei;SUN Wanjing;XIE Dekuan;XIAO Yizhou(Tongsujiayong Railway Co.,Ltd.,Cixi 430040,China;CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430040,China;CCCC Second Navigation Bureau Fourth Engineering Co.,Ltd.,Wuhu 241000,China;Key Laboratory of Transport Industry for Large-span Bridge Construction Technology,Wuhan 430040,China;Research and Development Center of Transport Industry for Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan 430040,China)

机构地区：[1]通苏嘉甬铁路有限责任公司,慈溪315300 [2]中交第二航务工程局有限公司,武汉430040 [3]中交二航局第四工程有限公司,芜湖241000 [4]长大桥梁建设施工技术交通行业重点实验室,武汉430040 [5]交通运输行业交通基础设施智能制造技术研发中心,武汉430040

出　　处：《交通科技》2024年第6期50-55,共6页Transportation Science & Technology

基　　金：中国博士后科学基金第61批面上(2017M612541)资助。

摘　　要：针对跨海高速铁路桥梁超长钢管桩试验匮乏、桩基设计参数等问题,文中依托杭州湾跨海铁路大桥工程,对超长钢管桩开展初打和复打高应变测试及静载试验,分析钢管桩承载力性能、贯入特性等沉桩机理,验证桩基设计参数,为大范围沉桩作业提供依据。结果表明,(1)在该试桩区地质条件下,采用YC80液压锤和HHD1000液压锤,能量传递效率为63%~84%,满足同类型工程桩的沉桩要求;(2)高应变检测法对于超大直径单桩基础承载力的评估存在偏于保守现象,其承载力值与静载试验值相比减少了18.35%;(3)试桩SZ-1、SZ-2轴向抗压承载力恢复系数为1.37和1.56,钢管桩沉桩后承载力存在显著的时间效应。(4)试桩SZ-1、SZ-2实测土塞效应系数为0.71和0.3,超长钢管桩存在显著的土塞效应。In view of the lack of field test of super-long steel pipe piles for cross-sea high-speed railway bridges and the problems of verifying the design parameters of pile foundations,relying on the Hangzhou Bay Cross-Sea Bridge project,the initial and re-driving high strain test and static load test are carried out on super-long steel pipe piles,to analyze the sinking mechanism of steel pipe piles such as the bearing capacity performance,penetration characteristics and other sinking mechanism,to further verify the design parameters of the pile foundations,and to provide the basis for the large-scale pile sinking operation.The results of the study show that firstly,under the geological conditions of this test pile area,using YC80 hydraulic hammer and HHD1000 hydraulic hammer with normal working performance,the energy transfer efficiency is in the range of 63%to 84%,which meets the requirements of the same type of engineering piles for pile sinking construction.Secondly,there is a bias of conservative phenomenon in the assessment of the bearing capacity of the large diameter monopile foundation by high strain testing method,which reduces the value of the bearing capacity by 18.35%comparing with that of the static test value.Thirdly,the coefficients of restoration of the axial compressive bearing capacity of test piles SZ-1 and SZ-2 are 1.37 and 1.56,and there is a significant time effect on the bearing capacity of steel pipe pile after sinking.Lastly,the measured soil plugging effect coefficients of test piles SZ-1 and SZ-2 are 0.71 and 0.3,and there is a significant soil plugging effect of the extra-long steel pipe piles.

关 键 词：超长钢管桩 锤击沉桩 极限承载力 闭塞效应 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]