群桩中基础承台、桩、土间的共同作用比单桩来得复杂。但在以往桩基设计中,都按单桩承载力设计,同时还考虑群桩的应力重叠,使群桩承载力低于单桩承载力之总和,引出一个群桩折减系数,而且从来不考虑桩基承台底面土的作用。近几年,虽然对群桩折减系数已予以放弃,但对群桩与承台 The combined effect of foundation piles, piles, and soil in pile group is more complicated than that of single pile. However, in the previous design of pile foundations, the design of bearing capacity of single piles was also considered. At the same time, the stress overlap of group piles was also considered, so that the bearing capacity of group piles was lower than the sum of bearing capacity of single piles, leading to a group pile reduction factor, and never Consider the role of soil on the underside of pile foundations. In recent years, although the group pile reduction factor has been abandoned, the group piles and piles