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复合地基的本质是增强体与地基土通过变形协调共同承担上覆荷载。褥垫层的设置起到了协调桩土变形的作用,但褥垫层工作性状及变形特性尚不明确,其厚度设计仍然参考规范依靠经验判断,往往不能充分发挥地基土的承载作用。目前复合地基设计通常采用褥垫层调节桩土变形,而忽略了桩端刺入沉降协调桩土变形来发挥地基土的承载作用,为了利用桩端刺入沉降协调桩土变形,充分发挥桩间土承载的作用,减薄褥垫层或不设褥垫层并减小设计桩长,以期降低地基处理费用,实现桩土共同承担荷载的目的,建立了通过控制桩端刺入沉降协调桩土变形的自平衡式复合地基设计方法。通过与褥垫层方法对比以及工程实例计算,结果表明,该方法可更好地发挥桩土承载作用,为复合地基优化设计提供参考。
The essence of the composite foundation is that the reinforcement and the subsoil can jointly bear the overburden through deformation coordination. The setting of cushion plays the role of coordinating the deformation of pile and soil. However, the working characteristics and deformation characteristics of cushion are not yet clear. The thickness design of the cushion is still based on experience and judgment, often failing to bring the bearing capacity of the foundation soil into full play. At present, the design of composite foundation usually adopts the cushion of cushion to adjust the deformation of pile and soil while ignoring the settlement of pile-end settlement to coordinate the deformation of pile-soil to exert the bearing capacity of foundation soil. In order to use pile-end piercing settlement to coordinate the deformation of pile and soil, Soil bearing role, reduce the mat or cushion and reduce the design of the pile length, with a view to reduce the cost of foundation treatment to achieve the purpose of bearing the burden of pile-soil, established by controlling the end of the pier penetration settlement pile Deformation of self-balanced composite foundation design method. The results show that this method can better play the role of pile-soil bearing, and provide references for the optimization design of composite foundations.