中文摘要：

运用 Zsoil 有限元软件建立桩锚支护延深开挖基坑数值模型，对加固支护结构连梁的节点连接形式、截面尺寸、支护平台宽度、二级支护桩的桩径和桩间距以及嵌入比等影响因数进行分析。结果表明：连梁节点连接形式，支护平台宽度对控制延深开挖基坑支护结构的受力和变形有明显影响。

英文摘要：

The deepening excavation foundation pit is required to reinforce the original supporting structure.The rein-forced supporting structures are designed based on experience,and are not understanding the mechanical characteristics and influencing factors.The numerical model of deepening excavation reinforced by pile-anchor structure is established by the FEM software Zsoil to study the influence of various factors on force and deformation characteristics,including the factors are as follows：the coupling form and stiffness of coupling beams;the platform width;the embedded ratio,spac-ing,stiffness of second-stage piles.The results show that the coupling form of coupling beams and the platform width have a significant effect on the force and deformation of deepening excavation foundation pit.