半逆作法和斜抛撑法在基坑支护结构体系中的运用对比

Comparison of the Application of Semi-reverse Method and Inclined-Bracing Method in Foundation Pit Supporting Structure System

主要对半逆作法和斜抛撑法在基坑支护结构体系中的运用进行了分析与比较,采用有限元软件对深圳某深基坑工程的不同支护方案进行了有限元模拟,并提出了比较结果。强调了基坑支护方案比选是基坑支护前期工作的必要环节,阐明了基坑支护设计方案的选择应充分考虑周边建筑物及地下管线的安全,严格控制好基坑施工期间的地面沉降与变形及其对周边环境的影响。在一定条件下,半逆作的支护方案优于斜抛撑的支护方案,特别是控制基坑顶部位移、减小坑顶地面沉降、减小施工难度、减小对主体结构的影响等方面有一定优势。同时应注意钢管支撑刚度及钢管稳定性的控制,并保证节点连接的可靠性。通过上述分析与比较,为类似工程积累了经验。

Mainly analyzes and compares the application of semi-reverse method and slanting bracing method in the structural system of foundation pit.The finite element software is used to simulate different supporting schemes of a deep foundation pit in Shenzhen,and the comparison results are presented.It is emphasized that the comparison and selection of foundation pit supporting scheme is a necessary link in the early stage of foundation pit supporting work,and the safety of surrounding buildings and underground pipelines should be fully con‐sidered in the selection of foundation pit supporting design scheme,and the ground settlement and deformation during foundation pit construc‐tion and its influence on the surrounding environment should be strictly controlled.Under certain conditions,the semi-inverse support scheme is superior to the slanting support scheme,especially in controlling the displacement of the top of the pit,reducing the ground settlement of the top of the pit,reducing the difficulty of construction and reducing the influence on the main structure.At the same time,attention should be paid to the control of steel tube support stiffness and stability,and ensure the reliability of joint connection.Through the above analysis and comparison,experience is accumulated for similar projects.