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在桩端土单层、桩侧土成层条件下,采用锥形虚土桩假设,研究虚土桩扩散角对桩纵向振动特性的影响。首先将桩体正下方到基岩的单层土体简化成锥形虚土桩,并划分为多个薄层,采用平面应变模型对桩侧土求解得到桩(和虚土桩)剪切复刚度,然后根据桩土耦合条件,求解桩(和虚土桩)纵向振动方程,利用复刚度传递法递推得到虚土桩桩顶的复刚度,并将其作为桩端土的实际支承刚度,进一步得到桩顶频域和时域响应表达式,最后分析虚土桩扩散角对桩动力特性影响的规律性,为虚土桩法研究和应用提供理论依据。
Under the condition of the single-layer pile and lateral soil layering, the hypothesis of cone-shaped soil-pile is used to study the influence of the diffusion angle of the soil-pile on the longitudinal vibration of the pile. Firstly, the single-layer soil below the pile body to the bedrock is simplified into a cone-shaped soil pile, which is divided into several thin layers. The plane strain model is used to solve the pile side soil Then, according to the pile-soil coupling condition, the longitudinal vibration equation of the pile (and the virtual soil pile) is solved and the complex stiffness of the top of the soil-pile is obtained by the complex stiffness transfer method, which is taken as the actual support stiffness of pile- Finally, the expression of frequency response in the top of the pile top and time domain is obtained. Finally, the regularity of the influence of the dispersion angle of the dummy soil pile on the dynamic characteristics of the pile is analyzed, which provides a theoretical basis for the research and application of the virtual soil pile.