A. 在压板或路堤下设置垫层是为了减小桩土荷载分担比，以充分利用桩间土的承载力
B. 设置褥垫层的目的对筏板基础是减小桩土应力比，对路堤是为了增加桩土应力比
C. 设置褥垫层的主要目的是为了便于排水，有效减少之后沉降量
D. 在筏堤下设垫层均为提高桩土应力比，以充分利用桩的承载力
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