斜抛撑设计与施工在大型基坑中控制变形的应用  

The application of diagonal bracing design and construction of controlling deformation in large foundation pits

作　　者：王年 Wang Nian(Shanghai Tunnel Engineering Co.,Ltd.,Shanghai 200232,China)

机构地区：[1]上海隧道工程有限公司,上海200232

出　　处：《山西建筑》2023年第12期95-97,101,共4页Shanxi Architecture

摘　　要：大型深基坑工程围护结构往往采用支护桩+外拉锚支撑体系形式,昆明市西山区某医院在基坑开挖过程中因基坑围护变形过大,导致外拉锚受力出现红色预警,轴力达到设计极限抗拉强度,针对该情况,为满足后续开挖安全,提出围护桩-斜抛撑-结构底板的组合受力体系,利用数值分析原理对整个开挖过程进行计算分析,模拟开挖过程基坑支撑体系的受力和变形,并针对施工工程关键点进行施工控制,消除了锚索轴力变化带来的不利影响,有益于类似条件下的深基坑工程建设。The retaining structure of large-scale deep foundation pit engineering often adopts support pile+external anchor support system,during the excavation process of a certain hospital in Xishan District,Kunming City,due to excessive deformation of foundation pit retaining structure,a red warning appeared for the external anchor force,and the axial force reached the design ultimate tensile strength,in order to meet the safety of subsequent excavation,this paper proposed the combined force system of retaining pile-diagonal bracing-structural bottom plate,using numerical analysis principles to calculate and analyze the entire excavation process,simulate the stress and deformation of foundation pit support system during the excavation process,and carry out construction control for key points of the construction engineering,eliminating the adverse effects caused by the changes in anchor cable axial force,beneficial for the construction of deep foundation pit engineering under similar conditions.

关 键 词：基坑开挖 斜抛撑 同济启明星 数值计算 

分 类 号：TU753.1[建筑科学—建筑技术科学]