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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 .
The practical formula for calculating the diameter of the pile and the diameter of the extended bottom under the action of the main vertical load and the negative friction is derived and deduced. The results show that the method is mainly applicable to the calculation of the ultimate bearing capacity of natural foundation and foundation Check the good site, at the same time, the bottom of the pile expansion must meet the corresponding construction requirements.