水下挤密砂桩承载力特性离心试验研究

Study on Bearing Capacity of Composite Foundation with Marine Sand Compaction Pile by Centrifugal Test

水下挤密砂桩利用挤密砂桩船通过回打、挤密、扩径等特殊的施工工艺形成更大直径、更高密实度的桩体。以室内离心试验为手段,以挤密砂桩的特殊施工工艺为基础制备了模型试样,利用机械手刚性板加载方式得出了荷载位移曲线及桩土应力比测试数据,分析了水下挤密砂桩复合地基变形破坏的3个阶段,并通过对比计算研究了水下挤密砂桩的承载力计算方法。

The sand compaction pile under the water uses sand pile ship through re-driving and compaction,expansion of special construction process,so as to form a pile of larger diameter and higher density. Through the laboratory centrifugal test,the model sample is prepared based on the special construction process of sand compaction piles,the load displacement curves and stress ratio of pile to soil test data are obtained using manipulator rigid plate loading,the 3 stages of sand compaction pile composite foundation under water deformation are analyzed,and the bearing capacity calculation method of the sand compaction pile under the water is studied by comparing the calculation.