扩底灌注桩的优化设计

The optimizing design of cast-in-place pile with enlarged bottom

扩底灌注桩的承载力受地层支承力及桩身混凝土强度的双重影响,其扩大头尺寸与桩径间存在有最优化的组合,利用Excel的迭代计算功能,以实际工程的具体地质条件及桩身混凝土强度为参数,用表格的形式优选出与各种扩大头尺寸相匹配的最经济的桩身直径,并计算出与其相应的单桩竖向承载力值。

The bearing capacities of cast-in-place pile with enlarged bottom are depended on bearing capacity of soil layer and the concrete strength of piles.There is an optimal combination between enlarged head size and pile diameter.In this thesis,the iterative calculation method is used with the Excel software rely on the parameters of geological conditions on site and concrete strength of piles.By this method,the most suitable size of piles’enlarged heads and the most economical piles’diameters can be determined with an Excel table.Moreover,the vertical bearing capacity of cast-in-place pile with enlarged bottom could also be estimated in this table.