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结合南京市桥北污水处理厂软基处理工程,开展了现浇X形桩(简称X形桩)单桩及单桩复合地基竖向承载力特性现场试验,测得了荷载-沉降曲线、桩土应力比、桩身轴力以及桩侧负摩阻力等分布规律,分析了不同桩间距与荷载等级下复合地基中桩土协调相互作用和荷载分担比;并进行了同等条件下等混凝土用量圆形桩竖向承载力特性试验和分析。结果表明:复合地基中X形桩桩侧负摩阻力主要发生在0.27倍桩长以上;同等条件下,桩侧负摩阻力最大值约为其正摩阻力最大值的60%;X形桩复合地基桩土荷载分担比较普通圆形桩复合地基桩土荷载分担比更合理,承载力也更高。
Combined with the soft foundation treatment project of Qiaobei WWTP in Nanjing City, field tests on the vertical bearing capacity of single-pile cast-in-situ X-shaped piles and single pile composite foundation were carried out. The load-settlement curves, The stress ratio, the axial force of the pile and the negative frictional resistance of the pile side, the coordination of pile-soil interaction and load-sharing ratio under different pile spacing and load level are analyzed. And under the same conditions, Test and Analysis of Pile Vertical Bearing Capacity. The results show that the negative friction of X-shaped piles in composite foundation mainly occurs above 0.27 times of pile length. Under the same conditions, the maximum negative friction of pile is about 60% Pile foundation soil load sharing more Ordinary circular pile composite ground pile load sharing ratio more reasonable, bearing capacity is also higher.