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本文推导上部结构—箱形基础—桩—地基土共同作用的基本方程。把笔者曾经提出的桩土共同作用位移影响系数的简化公式用于分析。同时,导出刚性基础—桩—地基土共同作用的弹塑性分析的计算公式,得出一些桩土共同作用性状。最后对上海某高层建筑的桩箱基础进行实例计算,验证本文提出的方法,探讨如何提高地基受荷比和合理安排桩的布局,对降低桩基础造价具有一定意义。
This paper deduces the basic equations for the joint action of the superstructure-box foundation-pile-foundation soil. The author put forward the simplified formula of the displacement coefficient of pile-soil interaction. At the same time, the calculation formulas for the elasto-plastic analysis of the joint action of rigid foundations-pile-foundation soil are derived, and some pile-soil interaction effects are obtained. Finally, an example calculation is made on the piled box foundation of a high-rise building in Shanghai, and the method proposed in this paper is verified. The discussion of how to improve the foundation load-bearing ratio and the arrangement of reasonable piles has certain significance for reducing the pile foundation cost.