深大基坑桩锚-桩撑联合支护结构实测分析  

FIELD MEASUREMENT AND ANALYSIS OF PILE ANCHOR PILE SUPPORT COMBINED SUPPORT STRUCTURE IN DEEP AND LARGE FOUNDATION PIT

作　　者：张贵弟 叶发永 陈思源[2] 亢红星 左丁一 董毓庆 Zhang Gui-di;Ye Fa-yong;Chen Si-yuan;Kang Hong-xing;Zuo Ding-yi;Dong Yu-qing

机构地区：[1]浙江东南网架股份有限公司,杭州311200 [2]浙江省建筑设计研究院,杭州310006 [3]杭州合跃科技有限责任公司,杭州310000

出　　处：《建筑技术开发》2022年第5期18-20,共3页Building Technology Development

摘　　要：依托杭州湾智慧谷二期深大基坑工程,结合工程实测数据探究深大基坑桩锚–桩撑联合支护结构自身变形规律,主要包括对基坑施工过程中的桩顶沉降、桩顶水平位移、立柱沉降及混凝土支撑轴力等进行监测及实测分析。结果表明:围护桩桩顶沉降变化曲线大体呈现两侧高中间低的凹槽形,外部重力荷载是桩顶沉降的主要影响因素;受工程地区特殊地层影响和对深层土体开挖产生"深度效应"的影响,桩顶沉降在第5周产生最大位移增量;基坑支撑形式、布置形式对基坑总体变形控制的效果并不显著;随着基坑开挖深度的增加支撑轴力在短期内增长较为明显,且这一趋势将在底板浇筑完成后才发生变化,而当开挖深层土时对远处支撑轴力的影响较为微弱。Relying on the second stage deep foundation pit project of Hangzhou Bay Wisdom Valley,the deformation law of the combined pile-anchor and pile-brace support structure’s own deformation law supporting structure of deep and large foundation pits is explored based on the measured data of the project,and it mainly includes the monitoring and actual measurement analysis of pile top settlement monitoring,pile top horizontal displacement monitoring,column settlement observation,and concrete support axial force during foundation pit construction.The result shows:the settlement curve of the pile top of the retaining piles generally presents a"groove shape"with high on both sides and low in the middle,external gravity load is the main influence factor of pile top settlement;affected by the special strata in the project area and the"depth effect"on deep soil excavation,the settlement of the pile top produces the largest displacement increment in the 5 th week;the support form and layout form of the foundation pit do not have a significant effect on the overall deformation control of the foundation pit;with the increase of the excavation depth of the foundation pit,the support axial force will increase significantly in the short term,and the trend will only change after the bottom plate is poured,and when excavating deep soil,the influence on the axial force of the remote support is relatively weak.

关 键 词：深大基坑 联合支护 桩顶水平位移 立柱沉降 

分 类 号：TU753[建筑科学—建筑技术科学]