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无粘性土的桩侧摩阻力计算公式:
其中:
K
-
横向土压力系数
σef
层中点处的有效应力
δ
桩侧和土体间的摩擦角
fs,i
ith 层侧摩阻力
fs,lim
ith层侧摩阻力极限值
As,i
ith层土内桩侧面积
横向土压力系数K 取决于桩端条件:
粘性土的桩侧摩阻力计算公式
α
粘结系数(桩与桩周土)
cu
ith 层土不排水抗剪强度
粘结系数 α 和极限侧摩阻力 fs,lim 可由软件自动计算,也可由工程师在定义岩土材料时自行输入。