摘要
为探讨基坑工程中反压土+斜支撑组合支护体系的变形特性,结合某超高层建筑工程基坑项目,总结反压土+斜支撑组合支护体系施工技术。基于FLAC3D建立数值模型,分析该支护体系的受力变形特性,并结合现场监测数据对比分析土体深层水平位移,研究普通水平支撑与反压土+斜支撑组合支护的效果差异性。结果表明,反压土+斜支撑组合支护体系可有效减小桩身位移。围护桩间土体模拟最大水平位移和实际最大水平位移分别为9.14,9.80mm,满足基坑变形控制条件。普通水平支撑体系由于基坑顶部的支撑刚度较大,限制顶部位移效果较好,反压土+斜支撑组合支护体系在基坑底部的位移比普通水平支撑小。
In order to discuss the deformation characteristics of the combined support system of back-pressed soil+inclined support in foundation excavation engineering,the construction technology of the combined support system is summarized based on a foundation excavation of a high-rise building.A numerical model is established to analyze the deformation of the supporting system.Combined with the field monitoring data,the deep horizontal displacement is compared and analyzed,and the effect difference between ordinary horizontal support and back-pressed soil+inclined support is studied.The results show that the combined supporting system of back-pressed soil+inclined support can effectively reduce the pile displacement.The simulated and actual maximum displacement of soil between retaining piles are 914,980mm respectively,which satisfy the deformation control condition of foundation.The ordinary horizontal support system has a great effect on limiting the displacement at the top of the foundation excavation,while the displacement of the combined support system of back-pressed soil combined with inclined support is smaller at the bottom of the foundation excavation.
作者
王斌
高文慧
邓世强
林宇亮
王振航
李柔锋
赵宗永
WANG Bin;GAO Wenhui;DENG Shiqiang;LIN Yuliang;WANG Zhenhang;LI Roufeng;ZHAO Zongyong(China Construction Third Engineering Bureau Group Co.,Ltd.,Wuhan,Hubei 430070,China;School of Civil Engineering,Central South University,Changsha,Hunan 410075,China;Changsha City Construction Project Quality and Safety Supervision Station,Changsha,Hunan 410016,China)
出处
《施工技术（中英文）》
CAS
2023年第11期61-65,125,共6页
Construction Technology
基金
国家自然科学基金(51878667)。
关键词
基坑工程
斜支撑
数值模拟
变形
控制
foundation excavation
inclined support
simulation
deformation
control
