Three-dimensional numerical analysis of factors affecting deformation of pile-anchor-support composite retaining structures for deep foundation pits
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摘要: 桩锚撑组合支护结构是一种复杂的基坑组合支护形式,其影响因素众多,目前设计理论尚不成熟。结合工程实例,通过数值模拟和现场监测,分析桩撑锚组合支护结构的受力和变形规律,并对其变形的影响因素进行了分析。得出结论如下：围护桩参数、内支撑刚度以及锚索参数都对该组合支护结构的变形有影响。适当减小围护桩直径以及增大围护桩嵌固深度,都可以减小该组合体系的水平向位移;增大内支撑刚度,内支撑自身承受的力增大,锚索轴力减小;增大锚索间距以及减小锚索的倾斜角都会使体系中内支撑的内力增大。Abstract: The pile-anchor-support composite retaining structure is a complex combination support system for foundation pits. It has many influencing factors, and the current design theory is not mature. Based on an engineering example, through numerical simulation and site monitoring, the force and deformation of the pile-anchor-support supporting structure as well as the influencing factors of deformation are analyzed. The conclusions are drawn as follows: parameters of the retaining piles and anchors, and stiffness of the supports can affect the deformation of the composite retaining structures. To reduce the diameter or increase the embedded depth of retaining piles appropriately can reduce the horizontal displacement of the composite retaining structures. Besides, by increasing the stiffness of the support, the force that supports bears will increase, and the axial force of anchors will decrease. Finally, to increase the anchor spacing or reduce the inclination angle of anchors can increase the internal force of the system.
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