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为了通过模型的方法预测砂土中抗拔群桩承载力,对抗拔单桩承载公式中的参数C进行了改进,并对此参数提出了一个预测公式。当抗拔单桩承载力未知时,不能逆分析C值,可以用预测公式计算C值。基于此推导了m×n型等距抗拔群桩承载力计算公式。结合2组模型试验的数据,验证了不同桩距、长径比和桩型下抗拔群桩承载力计算公式的合理性以及群桩效率和桩距的关系,并与其他3种计算方法的结果作比较。结果表明,4种方法都能很好地预测抗拔群桩承载力,但在预测长径比较小的群桩时,改进方法的预测结果更加接近试验值;在其他参数不变的情况下,群桩的效率随着桩距的增大而增大。
In order to predict the bearing capacity of the anti-pull group pile in sand by the model method, the parameter C in the bearing formula of the anti-pull single pile is improved, and a prediction formula is proposed for this parameter. When the bearing capacity of anti-pull single pile is unknown, the C value can not be inversely analyzed, and the C value can be calculated by the prediction formula. Based on this, the formula for calculating bearing capacity of m × n isometric pile group is deduced. Combined with the data of two sets of model tests, the rationality of calculating formulas of bearing capacity of pile groups with different pile spacing, aspect ratio and pile group under different pile groups is verified, and the relationship between pile group efficiency and pile spacing is verified. Compared with other three calculation methods The results for comparison. The results show that all the four methods can well predict the bearing capacity of the anti-pull group pile. However, the predicted results of the improved method are closer to the experimental values when the pile group with smaller length-diameter ratio is predicted. Under other conditions, The efficiency of pile groups increases with the pile spacing.