A. 当持力层为黏性土、粉土时，桩端进入持力层深度不宜小于2倍桩径
B. 当持力层为砂土时，桩端进入持力层的深度不宜小于1.5倍桩径
C. 当桩端持力层为碎石土时，桩端进入持力层深度不宜小于1倍桩径
D. 当存在软弱下卧层时，桩基以下硬持力层厚度不宜小于3m
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