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参照现有的静力法计算桩侧摩阻力的公式,提出了根据固结快剪c、?指标计算桩侧摩阻力的计算公式,其中有多个参数待定。根据收集到的上海地区19个工程摩擦型预制桩的试桩成果,采用最小二乘法,确定了上海地区主要软土层的待定参数,由统计得到的桩侧摩阻力的计算公式,计算出各试桩在各主要软土层的桩侧摩阻力和各试桩的极限承载力。结果表明,同一土层的各试桩桩侧摩阻力相关性较好,基本符合正态分布规律;单桩承载力计算值与实测值之间的误差较小;用上海地区主要软土层固结快剪c、?指标的上下限可以计算得到桩侧摩阻力上下限,根据19个工程统计得到的平均桩侧摩阻力在上下限之间;桩侧摩阻力的深度效应不明显,桩端持力层条件对桩侧摩阻力发挥有影响。
With reference to the existing formula for calculating friction on pile side, the formula for calculating friction on pile side based on c, 指 index of consolidation fast shear is put forward, among which several parameters are to be determined. According to the collected test results of 19 engineering friction precast piles in Shanghai area, the least square method was used to determine the parameters to be determined of the main soft soil in Shanghai area. The formulas Pile lateral friction resistance of test piles in each main soft soil layer and ultimate bearing capacity of each test piles. The results show that there is a good correlation between the lateral frictional resistances of the test piles in the same soil layer and basically in accordance with the normal distribution law. The error between calculated and measured values of single piles bearing capacity is small. Knot quick shear c ,? indicators of the upper and lower limits can be calculated pile upper and lower friction resistance, according to 19 engineering statistics obtained average pile friction between the upper and lower limits; pile side friction resistance depth effect is not obvious, The conditions of bearing strata affect the frictional resistance of pile.