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结合扰动状态理论(DSC),详细地分析了桩–土相互作用的荷载渐进性传递机制,提出基于DSC的荷载传递函数及其参数辨识方法。基于Matlab编程,重点分析了模型参数对τ-s曲线的影响规律。分析结果表明,参数η对桩土界面的强度特性的影响具有决定性作用,反映了桩土界面单元强度分布的集中程度,合理地选取参数η可以较好地描述桩–土界面的硬化、软化及弹塑性特性;参数ξ、τ-f对界面的强度特性影响较小,参数的改变只对最大侧摩阻力值产生影响,ξ、τ-f越大,侧阻力的极值也越大,但对τ_s曲线的线形几乎无影响;参数k对界面强度特性和τ-s曲线的线形都有一定的影响,k越大峰值强度越大,界面强度越高,达到侧摩阻力峰值所对应的界面位移越小。结合依托工程,理论模型计算结果与现场试桩实测值吻合较好,检验了该模型的正确与可靠性,对工程实际具有重要指导意义。
Combined with the perturbation theory (DSC), the progressive load transfer mechanism of pile-soil interaction is analyzed in detail, and the load transfer function based on DSC and its parameter identification method are proposed. Based on Matlab programming, the influence of model parameters on τ-s curve is analyzed. The results show that the influence of parameter η on the strength characteristics of pile-soil interface plays a decisive role, which reflects the concentration of strength distribution of pile-soil interface. Reasonably selecting the parameter η can well describe the hardening, softening and Elastic and plastic properties. The parameters ξ and τ-f have little effect on the strength characteristics of the interface. The change of the parameters only affects the maximum lateral frictional resistance. The larger the ξ and τ-f are, the greater the lateral resistance is. However, The curve of τ_s has little effect on the line shape; the parameter k has a certain influence on the interface strength and the line shape of τ-s curve. The larger the value of k is, the larger the peak intensity is, the higher the interface strength is and the one corresponding to the peak friction resistance The smaller the displacement. Combined with the relying on the project, the calculated results of the theoretical model are in good agreement with the measured values of the test pile in the field. The correctness and reliability of the model are verified, which has important guiding significance for the engineering practice.