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利用现场模型试验,研究了湛江组结构性黏土中群桩的承载性状和荷载传递机理;对比分析了单桩和群桩在竖向荷载作用下的荷载-沉降曲线、桩身轴力传递特性、桩端阻力特性和侧摩阻力特性。结果表明:单桩和群桩的Q-s曲线均表现为陡降型,有着明显的极限状态,均表现为摩擦型桩;群桩中各基桩端阻力发挥的比例大于相应单桩,且随桩间距增大而减小;单桩和群桩在一定桩长范围内,桩侧摩阻力随深度增加而增大;群桩极限桩侧摩阻力随桩间距增大而增大,且比单桩的要小,减小的比例在10.3%~21.8%之间。
By means of on-site model test, the bearing behavior and load transfer mechanism of group pile in structural clay of Zhanjiang Formation were studied. The load-settlement curve of single pile and group pile under vertical load, the axial force transfer characteristics of pile body, Pile end resistance and side friction characteristics. The results show that the Qs curves of the single pile and the group pile all show a steep drop type and have obvious limit state, all of them show as friction type pile; the end resistance of each pile in the group pile is greater than that of the corresponding single pile, The distance between pile and pile increases within a certain range of pile length, while the friction between pile and pile increases with depth; the lateral friction of pile group increases with the increase of pile spacing, Should be smaller, reducing the proportion of 10.3% ~ 21.8%.