中文摘要：

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。

英文摘要：

Research of pile groups vertical bearing and load transfer mechanism of structural clay in Zhanjiang group were done by conducting filed model tests.Single pile and pile groups under vertical loads on load-settlement curve,the distribution of axial force,shaft resistance were compared and analysed.The results show that Q-s curves of single and group piles are in sharp decrease presenting a clear limit state.This result shows that both single pile and pile groups are friction piles.The proportion of tip resistance of each foundation pile on pile groups is greater than that of the corresponding single piles,and decreases with the increasing of pile spacing.Shaft resistance of single pile and pile groups increases with the increasing depth within a certain range pile length.Shaft resistance of each foundation pile on pile groups increases along with the pile spacing,and smaller than the single pile.The proportion of reduction is between 10.3% and21.8%.