This paper stresses on the analysis of the mathematical and physical significance of the average additional stress coefficient and its merit in foundation deformation calculation.

本文着重分析了平均附加应力系数的数学物理意义及用它计算地基变形的优点。

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The formula for effect coefficient of piles group were solved gradually under different shape of laying-out piles according to principle of additional stress superposition.

根据附加应力叠加原理，逐步推导得到不同布桩形式的群桩效应系数计算公式。

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