湿陷性黄土地区大直径挖孔扩底灌注桩实用设计方法

Practical design method for large-diameter cast-in-situ piles with enlarged bases in wet-collapsing loess

分析推导出大直径挖孔扩底灌注桩在主要竖向荷载和负摩阻力作用下 ,计算桩身直径和扩底端直径的实用公式 ,指出其主要适用于可不进行天然地基和基础抗震承载力验算的良好场地 ,同时 ,桩基扩底端等必须满足相应的构造要求 .

Taking up consideration of large diameter ca st in situ piles with enlarged bases subjected mainly to vertical load and neg ative mantle friction, a practical formula is given to determine the diameter of pile shaft with enlarged bottom. It is, meantime, pointed out that this method is mainly to be used for the construction sites where the anti seismic bearing capacity is not required to be calculated. Furthermore, the corresponding constr uctional requirements such as those of enlarged base of pile are to be satisfied .