简述桩基础的设计步骤。
(1)选择桩型与几何尺寸,初步选择承台底面的标高;(1分)(2)确定单桩承载力、桩数及其在平面上的布置;(1分)(3)桩基中各单桩受力验算;必要时进行群桩地基的承载力和沉降验算;(1分)(4)单桩的设计和承台的设计;(1分)(5)绘制桩基础施工图。(1分)
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