盆式开挖预留土墩支护结构稳定性与变形分析  

Deformation and stability analysis of deep excavations supported by earth berms and short bracing system

作　　者：周同和 郭院成[2] 秦会来[3] 高伟 李明宇[2] Zhou Tonghe;Guo Yuancheng;Qin Huilai;Gao wei;Li Mingyu(Zhengzhou University Multl-functional Design and Research Academy Co.Ltd,Zhengzhou 450002,China;School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Technical Center,China State Construction Engineering Corporation,Beijing 101300,China)

机构地区：[1]郑州大学综合设计研究院,河南郑州450002 [2]郑州大学土木工程学院,河南郑州450001 [3]中国建筑股份有限公司技术中心,北京101300

出　　处：《建筑科学》2018年第11期14-21,共8页Building Science

基　　金：长短桩复合地基协同工作机制及变形刚度计算理论研究(国家自然科学基金项目批准号:50978235);河南省教育厅科学技术研究重点项目运营地铁盾构隧道纵向变形机理及安全评判研究(14A560017);错缝拼装盾构隧道结构横纵向性能相关性及作用机理研究(国家自然科学基金项目批准号:51508520)

摘　　要："盆式开挖短支撑支护"是一种基坑工程开挖阶段性支护形式,先期利用预留土体、已施工形成的地下结构与排桩或地下连续墙围护结构之间形成的一排或多排支撑体,构成所谓"盆式开挖短支撑"支护。该支护形式不仅节省支撑成本,也有利于基坑变形控制。盆式开挖中预留土墩在支撑施工前为排桩或地下连续墙围护结构提供被动区抗力,在支撑形成后期起到一定的变形控制作用。结合郑州某17m深基坑工程,提出了盆式开挖短支撑支护阶段,土墩支护效应、支护体稳定性分析以及变形的简化计算方法。经与有限元模拟结果及工程实测结果的比较,验证了所提简化计算方法的可靠性。研究成果可为类似支护设计与分析提供参考。A kind of retaining system for a stage of deep excavation is formed by reserved soil, and completed subsurface structures and piles or supports formed between diaphragm walls. The system is economical and helpful for deformation-control foundation pit. Retaining soil berms in basin excavation provide passive zone resistance for piles or diaphragm walls in the early stage of supporting construction, and play a role in deformation control in the later stage of supporting construction. Based on a real 17 m deep excavation project in Zhengzhou, a simplified method is presented for the effect of soil berms, stability analysis of supports and deformation calculation in the short bracing stage of basin excavation. The reliability of the simplified calculation method is verified by comparison with the results of finite element simulation and engineering measurement. The research results can provide reference for similar support design and analysis.

关 键 词：基坑支护 盆式开挖 土压力 稳定性分析 

分 类 号：TU432[建筑科学—岩土工程]