UHC管桩在200m超高层建筑中的应用  

Application of the UHC pile in 200m super high-rise building

作　　者：卫佳琦 尹骥 李想 徐司慧 张孝义 谭一明 康强文 WEI Jiaqi;YIN Ji;LI Xiang;XU Sihui;ZHANG Xiaoyi;TAN Yiming;KANG Qiangwen(SGIDI Engineering Consulting(Group)Co.,Ltd.,Shanghai 200093,China;Shanghai Geotechnical Consultant Platform,Shanghai 200093,China;Changsha Xingwan Co.,Ltd.,Changsha 410000,China)

机构地区：[1]上海勘察设计研究院(集团)有限公司,上海200093 [2]上海市岩土工程专业技术服务平台,上海200093 [3]长沙绿地星湾置业有限公司,长沙410000

出　　处：《建筑结构》2023年第S01期2486-2491,共6页Building Structure

基　　金：上海市地质之星人才计划(Dzxh202203)

摘　　要：超高层建筑荷载较大,较少采用预制桩。本文在长沙某住宅项目中,通过系统的地基、单桩和桩筏载荷板试验、施工措施改进和三维数值分析,将UHC超高强预应力管桩成功应用于200m超高层住宅建筑,为相关工程提供了宝贵的经验。研究发现,相对于桩筏载荷试验结果,通过地基土载荷试验和单桩载荷试验分别得出的地基土和桩基刚度是偏于保守的,但满足工程设计需求;UHC管桩在圆砾层或残积含砾粉质黏土层中沉桩难度较大,可采用长螺旋引孔、重锤低击等方式确保有效桩长;采用小应变硬化土的三维数值分析模型计算表明,超高层沉降和倾斜率满足设计要求;沉降监测数据显示,建筑物最终沉降约为1cm,表明了在超高层建筑中采用UHC管桩的桩土共同作用方案是切实可行的。The load of super high-rise buildings is usually large,thus pre-stressed pile cannot be used in the foundation.Based on the systematic load tests,improved construction measures and numerical modelling,the UHC piles were successfully applied in the super high-rise building(200m),which provides valuable experience for similar projects.It is found that,the rigidity of the soil and the pile back-calculated by the load tests of the soil and pile compared with the load tests of the pile-raft was relatively conservative,but still satisfied the requirement of the designer.The resistance of the driven piles was large in the round gravel and the residual silty clay layer with gravel.Measures such as pre-boring and small driven energy should be taken to make sure the designed effective length of the piles.Three-dimensional numerical results produced by Hardening Soil Model with Small strain showed that the calculated settlement and inclination satisfy the requirements of the designers.The monitored settlement data(about 1cm)showed that the application of the UHC pile in the high-rise building with the concept of the soil-pile interaction was successful.

关 键 词：超高强预制管桩 超高层建筑 桩土共同作用 数值分析 

分 类 号：TU973[建筑科学—结构工程]