解释了基桩受流动土体作用的土压力形成机理，阐述了土压力大小与土性参数、基桩布置型式的关系。
Mechanism of interaction of pile and soil movement is discovered at the point of soil arching effect, and relationship between earth pressure and soil properties or piles arrangement are illustrated.
群桩已不再具有圆形单桩的轴对称性，因此群桩的承载特性及群桩效应不仅受桩间距的影响，而且受群桩布置方式的影响。
Therefore, not only the pile spacing but also the pile group layout will have influence on both the bearing capacity and the pile group effect of pile groups.
在考虑地下室基础承台刚域及抗拔桩布置的情况下，对基础梁的弯矩计算进行分析推导，得出了跨中弯矩的折减系数计算公式。
Moments on basement foundation beams considering rigid zone of pile caps and pulling resistance of piles are analyzed. Reduction factor of midspan moment is gained.
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