以色列某地铁车站临时底板的抗浮验算  

Anti⁃floating checking for temporary bottom slab of a subway station in Israel

作　　者：周思源 娄宇赛 贾剑辉 刘晓敏 杨军[1] ZHOU Siyuan;LOU Yusai;JIA Jianhui;LIU Xiaomin;YANG Jun(Key Laboratory of Civil Engineering Safety and Durability of the State Ministry of Education,Tsinghua University,Beijing 100084,China;CSCEC International Construction Co.,Ltd.,Beijing 100029,China;China Construction Sixth Engineering Division Co.,Ltd.,Tianjin 300451,China)

机构地区：[1]清华大学土木工程系土木工程安全与耐久教育部重点实验室,北京100084 [2]中建国际建设有限公司,北京100029 [3]中国建筑第六工程局有限公司,天津300451

出　　处：《建筑结构》2023年第17期127-133,共7页Building Structure

基　　金：中建股份科技研发课题(CSCEC-2020-Z-41)。

摘　　要：以色列某地铁车站由于特殊施工承包安排,车站分为外箱和主体结构两阶段施工,其中外箱包括地下连续墙、顶部钢甲板和临时底板。由于地下水位较高,当盖挖车站外箱建成临时底板并停止降水后,临时底板会受到较大的水浮力,此时车站永久结构和顶部回填土尚未施工,需进行抗浮验算。通过理论计算和有限元分析,验算车站外箱整体抗浮,确定临时底板与地下连续墙新旧混凝土连接界面处内力设计值,并按规范验算界面抗剪承载力。结果表明,车站外箱整体抗浮安全。参考国外规范和中国规范,界面抗剪承载力满足要求。按中国规范计算所得界面抗剪承载力相对按国外规范计算结果较小,其原因在于未能充分考虑设计方案中较高钢筋强度、较大钢筋直径的贡献。Due to the special construction contract arrangement,a subway station in Israel is divided into two stages of construction:the outer box and the main structure.The outer box consists of diaphragm wall,top steel deck and temporary bottom slab.For the high groundwater level,when temporary bottom slab of the cover⁃excavation station is built and dewatering is stopped,the temporary bottom slab will be subjected to large water buoyancy.At this time,the permanent structure of the station and the top backfill soil have not been constructed yet,and anti⁃floating check calculation needs to be carried out.Through theoretical calculation and finite element analysis,the whole anti⁃floating safety of the station outer box was checked,the internal force design values at the new and old concrete interface between the temporary bottom slab and the diaphragm wall were determined,and the interface shear capacity according to the codes were checked.The results show that the whole anti⁃floating of the station outer box is safe.Referring to foreign and Chinese codes,the interface shear capacity meets the requirements.The interface shear capacity calculated by Chinese code is relatively smaller than that calculated according to the foreign codes,mainly because the contribution of higher strength and larger diameter of the reinforcement in the design scheme is not fully considered.

关 键 词：地铁车站 临时底板 连接节点 植筋连接 抗剪承载力 

分 类 号：TU942[建筑科学—建筑技术科学]