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通过一系列模型试验研究了倾斜荷载作用下吸力式沉箱基础的最佳作用点位置,试验中考虑了荷载作用点、荷载作用角度和长径比3个重要因素。基于模型试验得到的荷载-位移曲线,采用合适的破坏标准确定了各工况下吸力式沉箱基础的抗拔承载力,根据承载力的变化规律分析确定了吸力式沉箱基础的最佳作用点位置。结果表明,荷载作用角度对吸力式沉箱基础承载力的影响显著,当荷载水平作用于基础时,其承载力最大。荷载作用点位置对吸力式沉箱基础承载力的影响取决于荷载作用角度的大小,当荷载作用角度较小时,荷载作用点位置的影响显著,且最佳作用点位置位于沉箱高度的2/3~3/4处;当荷载作用角度较大时,荷载作用点位置的影响很小,可以忽略。结合荷载与吸力式沉箱基础的转角关系,分析了荷载水平作用于最佳作用点下吸力式沉箱基础的破坏模式。
Through a series of model tests, the optimal working point of suction caisson foundations under inclined load was studied. Three important factors including load point, load angle and aspect ratio were considered. Based on the load-displacement curves obtained from the model tests, the pull-out bearing capacity of the suction caisson foundations under various working conditions was determined by the appropriate failure criterion. According to the variation of bearing capacity, the optimum working point position of the suction caissons was determined . The results show that the effect of load angle on the bearing capacity of suction caissons is significant. When the load level acts on the foundation, the bearing capacity is the largest. The influence of load acting point on the bearing capacity of suction caissons depends on the magnitude of load acting angle. When the load acting angle is small, the position of load acting point is significant, and the optimum acting point is located at 2/3 ~ 3/4; when the load angle is large, the impact of the location of the load point is small, can be ignored. Based on the relationship between load and suction caisson foundation, the failure mode of suction caisson foundation under the optimal action point is analyzed.