摘要
目前深基坑支护设计过程中对于圆环支撑的设计多布置于形状规则、周边荷载分布均匀的基坑工程中。天津117大厦项目具有基坑开挖面积大、开挖深度大、设计施工难度大的特点,且由于周边环境特点及工期调整原因造成基坑南北荷载差异较大,项目采用了地连墙结合两道超大圆环混凝土支撑的支护形式。本文基于ABAQUS软件建立"土体-支护"数值模型对项目圆环支撑在非对称荷载作用下的变形特征进行了理论计算并与实际监测数据对比,验证模型能够较好的反应实际情况。并在此基础上从内部环梁直径与截面尺寸、角部支撑型式(刚度)三个方面对混凝土圆环支撑体系杆件的合理布置进行优化分析。
At present, the design of the circular support in the deep foundation pit support design is mostly arranged in the foundation pit project with uniform shape and uniform surrounding load distribution. Tianjin 117 Building Project has the characteristics of large excavation area, large excavation depth and difficult design and construction. Due to the surrounding environment characteristics and the adjustment of construction period, the north-south load difference of the foundation pit is large. The support form of the ground- wall connection configuration combining super large ring concrete support is adopted. Based on the ABAQUS software to establish the “soil-support” numerical model, the deformation characteristics of the project's annular support under asymmetric load are theoretically calculated and compared with the actual monitoring data,through which, we verify that the model can better reflect the actual situation. On this basis, the reasonable arrangement of the concrete ring support system is optimized from three aspects: internal ring beam diameter and section size and corner support type (stiffness).
作者
冯晓腊
梁明志
熊宗海
夏达东
冉秀峰
FENG Xiaola;LIANG Mingzhi;XIONG Zonghai;XIA Dadong;RAN Xiufeng(Faculty of Engi., China Univ. of Geosciences, Wuhan 430074, China;WuHan FengDa Geological Engi. Co., Ltd., Wuhan 430074,China;China Construction Third Engi. Bureau,Wuhan 430074,China)
出处
《低温建筑技术》
2018年第12期105-109,共5页
Low Temperature Architecture Technology
关键词
深基坑工程
环撑体系
非对称荷载
变形特征
数值模拟
优化分析
deep foundation pit engineering
ring bracing system
asymmetric load
deformation characteristics
numerical simulation
optimization analysis
