挤扩支盘桩与土层共同作用的模型试验研究

以相似理论为基础,采用原型粉粘土和微混凝土挤扩支盘桩制作相似模型, 通过对桩土共同作用模型中支盘桩的承载能力、变形特征、土层的压力变化和桩土阻力及沉降关系的观测,分析了支盘桩支盘的作用特性以及与全桩承载力的关系.另外,通过与等直径模型桩的对比,表明了支盘桩的承载能力远高于等直径桩,并且相应的沉降变形则要小得多.试验成果为支盘桩的工程应用提供了有价值的参数和实验依据.

Experimental research on the interaction between piles with branches and plates and surrounding soil

According to the similarity theory, a similar model of piles with branches and plates was designed and built. Based on the observation on the bearing capacity, characteristics of deformation, soil pressure variation and the frictional force between pile and soil with the settlement of the soil, the behavior of branches and plates and bearing capacity behavior of piles have been studied and analyzed. In addition,in contrast to the model with equivalent-diameter pile,it can be seen that the bearing capacity of the pile with branches and plates is much higher than that of the piles with equivalent-diameter,while its settlement is much lower. The achieved results of the model test provide valuable parameters and testing datum for engineering application of piles with branches and plates.