锚碇式支护在市政深基坑工程中的应用研究

Research on the Application of Anchorage Supporting Structurein Municipal Deep Foundation Pit Engineering

结合福州市三环路某箱型通道基坑采用锚碇式支护体系的工程实例,推导锚碇结构的弹性支点刚度系数,并将其应用于计算。建立有限差分数值模型,分析锚碇式支护结构的变形特征,验证其可靠性,分析讨论锚碇结构发生整体侧移对支点刚度产生的不利影响,提出计算软土基坑时对弹性支点刚度系数进行折减使用的方案。施工及监测结果表明,锚碇式支护结构在工程中获得良好的应用效果。

This article combines an engineering example of using pile and anchorage supporting structure in a box shaped channel foundation pit on the Third Ring Road in Fuzhou.Based on the principles of foundation pit specifications,the elastic support stiffness coefficient of the anchorage structure was derived and applied to the pile arrangement module of the general foundation pit software for calculation.A finite difference numerical model was established to analyze the deformation characteristics of the pile and anchorage structure,verify the reliability of the support structure,and analyze the adverse effects of overall lateral displacement of anchorage structures on the stiffness of support points.A scheme of reducing stiffness coefficient of elastic fulcrum is put forward when calculating soft soil foundation pit..The construction and monitoring results indicate that the pile and anchorage structure has achieved good application results in this project.