倾斜荷载作用下沉箱基础的极限承载力计算方法

Calculation Methods for Ultimate Inclined Bearing Capacity of Caisson Foundation under Inclined Load

为了确定沉箱基础在顶部受到倾斜荷载时的抗拔承载力,利用极限包络线方法进行分析。基于15组模型试验以及合理假定,提出了水平荷载、竖向荷载作用下沉箱基础的极限抗拔承载力函数,通过分析水平、竖向极限承载力系数与长径比的关系,提出了水平、竖向荷载作用下沉箱基础的承载力计算方法。基于不同长径比、不同荷载作用角度下沉箱基础的水平承载力归一化分量和竖向承载力归一化分量之间的破坏包络线图,得到了两者之间的幂函数关系,从而得到了沉箱基础在倾斜荷载作用下的极限承载力。

Limit envelope method is employed to obtain the uplift bearing capacity of caisson foundation under inclined load.Functions of ultimate uplift bearing capacity of caisson foundation under horizontal load and vertical load are presented based on 15 sets of model tests and reasonable assumptions.Through analyzing the relationship of coefficients of horizontal and vertical ultimate bearing capacity respectively vs.ratio of length to diameter,the calculation methods for the bearing capacity of caisson foundation under horizontal load and vertical load are obtained.Furthermore,a power function between normalized ultimate horizontal bearing capacity and normalized ultimate vertical bearing capacity of caisson foundation in the presence of varying ratio of length to diameter and angle of load i obtained according to the diagram of failure envelope between the two normalized values.And then the ultimate bearing capacity of caisson foundation under inclined load is obtained.