A. 当持力层承载力低于桩身混凝土受压承载力时，可采用扩底
B. 钻孔桩扩底端直径与桩身直径的比D/d一般宜为3
C. 扩底端侧面斜率一般取1／4～1／2
D. 扩底端弧形底面的矢高一般取（0.1～0.15）D
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