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通过对宁波绕城高速公路东段软土地区26根超长桩静载测试数据的分析,研究了持力层为亚粘土、亚砂土的软土中超长桩的承载特性和荷载传递机理,得到了桩端阻力、桩侧摩阻力发挥规律和桩身压缩变形规律。结果表明,超长桩的Q-s曲线大多为缓变型;在极限状态下,端阻力一般占极限荷载的20%左右,桩身压缩量一般占桩顶总位移的30%～50%;同时得出了该地区粘土、淤泥质粘性土、亚粘土及亚砂土四种典型土层的荷载传递参数a、b的统计值,为今后超长桩的理论研究和设计应用提供了重要的参考。
Through the analysis of the static load test data of 26 super long piles in the soft soil area of the eastern section of Ningbo Ring Expressway, the bearing capacity and load transfer mechanism of the super long piles in the soft clay soil where the bearing layer is sub-clay and sandy soil are studied. Obtained the pile end resistance, pile side friction resistance law and pile compression deformation. The results show that the Qs curves of the long pile are mostly graded. In the ultimate state, the end resistance generally accounts for about 20% of the ultimate load, and the pile compression generally accounts for 30% ~ 50% of the total pile top displacement. The statistical values of the load transfer parameters a, b of clay, silty clay, loam and sandy soil in this region provide important references for the theoretical research and design application of extra long piles in the future.