深基坑组合支撑系统换撑技术研究  

A Study of the Support-Replacing Techniques for the Combined Bracing Systems of Deep Foundation Pits

作　　者：申笑寒 张顺伟 孟江 朱利明 王海彦 SHEN Xiaohan;ZHANG Shunwei;MENG Jiang;ZHU Liming;WANG Haiyan(The Municipal Construction Co.Ltd.of the 15th Bureau Group of China Railway,Luoyang 471000,China;The Bridge&Tunnel and Rail Transit Research Institution Co.Ltd.of the Nanjing Polytechnic University,Nanjing 210032,China;The College of Transportation Science&Engineering,Nanjing Polytechnic University,Nanjing 210009,China)

机构地区：[1]中铁十五局集团城市建设工程有限公司,河南洛阳471000 [2]南京工大桥隧与轨道交通研究院有限公司,江苏南京210032 [3]南京工业大学交通运输工程学院,江苏南京210009

出　　处：《国防交通工程与技术》2020年第6期52-56,共5页Traffic Engineering and Technology for National Defence

摘　　要：针对南京某地铁车站深基坑支护换撑技术方案,通过建立三维数值分析模型,模拟不同换撑方案对围护结构变形及内力状态的影响。计算结果表明,以索换撑处理方案使得围护结构变形急剧增大,支撑节点处弯矩和剪力突增,该换撑方案要达到控制变形要求,势必会提高成本。由于南方地区地层富含地下水,土体软弱、蠕变大,考虑到控制基坑变形,最终选用以撑换撑处理方案。研究结果可为类似工程围护结构换撑设计、基坑工程安全施工提供技术指导和经验借鉴。Aiming at comparing and analyzing the merits and demerits of different technical schemes of the support replacement for a deep foundation pit of a certain metro station at Nanjing,a three-dimensional numerical analysis model is established to simulate the effects of the different support-replacing schemes on the deformation and the internal force state of the retaining structure.The calculated results show that the scheme of replacing bracing with cables makes the deformation of the retaining structure increase sharply,and the moment and shear force at the supporting nodes increase abruptly.If the scheme of replacing bracing with cables could meet the requirements of the deformation control,it would increase the cost,because the stratum in South China is rich in groundwater,the soil mass is weak and the creep is great.Considering controlling the deformation of the foundation pit,the supports-replaced-with-supports scheme is finally chosen for the project.The results of our studies may provide technical guidance and experience for the design of other retaining structure-replacement and the safe construction of foundation pits.

关 键 词：深基坑 换撑技术 基坑支护 变形分析 

分 类 号：U231.4[交通运输工程—道路与铁道工程]