基于Rayleigh分布扰动状态概念的单桩承载特性研究

Research on Bearing Characteristics of Single Pile Based on Rayleigh Distributed Disturbed State Concept

基于扰动状态概念(Disturbed State Concept,DSC),结合Rayleigh分布从微观角度描述桩-土界面荷载渐进性传递特性,建立了基于DSC理论的桩侧及桩端荷载传递模型,给出了模型参数确定方法,并验证了模型的合理性.同时结合桩侧及桩端荷载传递模型,提出了一种分析单桩承载特性的迭代算法并验证其合理性.通过算法计算得到的单桩承载特性与案例实测值有较好的一致性,且可较好地反映侧阻及端阻硬化、软化等特性.变参数分析结果表明,基于DSC理论的桩侧及桩端荷载传递模型对不同土层、不同桩基施工工艺都有好的适用性,可较准确地描述桩-土界面荷载传递特性.

Based on the disturbed state concept(DSC),and combined with Rayleigh distribution,the progressive load transfer characteristics of the pile-soil interface are described from a microscopic perspective.The load transfer model of pile side and pile end based on DSC theory is established,the method of determining model parameters is given,and the rationality of the model is verified.Combined with the load transfer model of the pile side and pile end,an iterative algorithm for analyzing the load bearing characteristics of a single pile is proposed,and its rationality is verified.The bearing characteristics of a single pile calculated by this method are in good agreement with the measured values of the case,and this method can reflect the hardening and softening characteristics of side resistance and end resistance.The results of variable parameter analysis show that the load transfer model of pile side and pile end based on DSC theory has good applicability to different soil layers and pile foundation construction technologies and can accurately describe the load transfer characteristics of the pile-soil interface.