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依托南京市桥北污水处理厂现场静载荷试验,应用ABAQUS软件分别建立了现浇X形单桩复合地基、群桩(梅花形布置和正方形布置)复合地基桩侧摩阻力的模型。结果表明:现浇X形桩中性点出现在桩长1/4～1/3深度处,负摩阻区明显存在但小于正摩阻区,是典型的摩擦型桩;侧摩阻力随桩体模量、土体参数和一定范围内桩长的增大而增大,随褥垫层厚度的增大而减小;布桩间距影响侧摩阻力的发挥,在允许的承载范围内,应尽量增大布桩间距,优化侧摩阻力的分布。
Relying on the static load test of Qiaobei WWTP in Nanjing, a model of pile lateral friction of composite foundation with cast-in-situ X-shaped single-pile composite foundation and group pile (plum-shaped arrangement and square arrangement) was established by using ABAQUS software. The results show that the neutral point of the cast-in-situ X-shaped pile appears at the depth of 1 / 4-1 / 3 of the pile length, and the negative friction zone exists obviously but less than the positive friction zone, which is a typical friction pile. Body modulus, soil parameters and a certain range of pile length increases and increases with the increase of the thickness of the cushion decreases; Pitch spacing affect lateral friction resistance, within the allowable bearing range should be Try to increase the distance between the piles and optimize the distribution of the side friction.