【单选题】【消耗次数：1】
在竖向荷载作用下，群桩中的（ ）的相互作用导致各基桩的承载力和沉降性状与独立单桩有很大差别，这种现象称为群桩效应。
①
基桩和土体
②
基桩和承台
③
土体和承台
④
基桩、土体和承台
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