摘   要：通过室内模型试验，研究了粉砂地层中超长桩的荷载-沉降（Q-s）关系、桩身轴力、桩侧摩阻力、桩身压缩、桩端阻力、桩土相对位移等承载性状及荷载传递规律。结果表明，超长桩的Q-s曲线为缓降型，与端承摩擦桩的Q-s曲线相似。随桩顶荷载的增加，桩侧摩阻力沿桩身分布逐步由一个峰值转变为两个峰值，桩身压缩主要发生在桩身上部，桩侧摩阻力随桩土相对位移增加基本符合双曲线发挥规律。桩端阻力随桩顶荷载增加变化可分为缓慢增长段、加速增长段和减缓破坏段，荷载较小时，桩端阻力与桩端位移基本呈线性关系，随荷载增大，桩端位移加速增长，极限荷载后，桩端出现刺入变形。

Abstract: Through the indoor model test, the load-settlement (Q-s) relationship of the super-long piles in the silt sand stratum, the bearing capacity and load transfer law of pile axial force, pile side friction resistance, pile compression, pile end resistance, relative displacement of pile and soil are studied. The results show that the Q-s curve of the super-long pile is slow descending type, and it shows the end-bearing friction pile. With the increase of the pile top load, the pile side frictional resistance gradually changes from one peak to two peaks along the pile body distribution; Pile compression mainly occurs in the upper part of the pile body. The pile side friction is basically consistent with the hyperbolic law with the increase of relative displacement of pile and soil. With the increase of pile top load, pile tip resistance can be divided into slow growth section, accelerated growth stage and slow failure section. When the load is small, the pile end resistance and the displacement of the pile end are basically linear. As the load increases, the displacement of the pile end accelerates rapidly. After the ultimate load, the pile end appears piercing deformation.