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。
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.
在进行群桩模型试验研究过程中，作者发现实测群桩效应系数与规范表中相应的数值存在较大差异。
In the course of studying on pile group under its model test, it is discovered th at the measured value of effect coefficient of pile group is larger than that in the codes table.
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