钢支撑架设滞后对地连墙基坑变形影响分析  

Influence analysis of delayed steel brace installation on diaphragm wall in deep excavation

作　　者：杨春阳 王丽娜 祝建勋[1] 孙兰坚 赵智涛[3] Yang Chunyang;Wang Lina;Zhu Jianxun;Sun Lanjian;Zhao Zhitao(Beijing Agile-Tec Engineering Consultants Co.,Ltd.,Beijing 100050;Beijing Urban Rapid Rail Construction Management Co.,Ltd.,Beijing 100010;Beijing Rail Transit Construction Management Co.,Ltd.,Beijing 100068)

机构地区：[1]北京安捷工程咨询有限公司,北京100050 [2]北京城市快轨建设管理有限公司,北京100010 [3]北京市轨道交通建设管理有限公司,北京100068

出　　处：《工程勘察》2024年第1期27-33,共7页Geotechnical Investigation & Surveying

基　　金：北京市轨道交通建设管理有限公司双创基金项目(SCJJ2023001).

摘　　要：为研究钢支撑滞后对深基坑支护体系变形的影响,以目前处于施工高峰期的北京地铁13号线、22号线某深基坑为例,通过监测数据分析钢支撑滞后并叠加多种不利因素工况下中立柱、相邻钢支撑轴力变化情况,以及围护结构的变形模式。结果表明:快速的土方开挖与支撑滞后情况下,宽大基坑中立柱隆起速率明显增加;同一断面内第2、3道支撑滞后会导致第1道支撑轴力快速上升;偏压影响下,同一断面内基坑两侧围护结构变形模式不同且墙顶位移方向相反;同基坑不同断面第1道支撑滞后与第2道支撑滞后其围护结构变形模式存在差异;不同壁厚基坑其地连墙敏感度明显不同。In order to study the influence of delayed steel brace construction on the supporting system deformation of deep excavation pit,the axial force changes of the center posts and adjacent struts,and the deformation mode of the support structure under the condition of steel brace construction delay imposed several adverse factors are discussed after monitoring data analysis in a deep excavation project of Beijing Metro Line 13 and Line 22,which are currently in the peak period of construction.The results show that under the condition of fast earthwork excavation and lateral support construction delay,the uplift rate of posts in wide pit increases obviously;the delay of the second and third lateral support construction in the same section will lead to the rapid rise of the axial force in the first layer lateral braces;the deformation mode and displacement direction of the wall top of the retaining structure on both sides of the pit in the same section are obviously different with the influence of unilateral construction load bias;there are differences in the deformation modes of the supporting structure with different sections of the pit;the sensitivity of the pits with different diaphragm wall thicknesses is obviously different.

关 键 词：深基坑 钢支撑滞后 支撑轴力 变形模式 

分 类 号：TU473.1[建筑科学—结构工程]