摘要
为了研究层状地基中大直径桩的竖向振动特性,首先修正了经典土体振动模型,进一步研究了塑性指数及桩周土体应变对土体的动剪切应力、动剪切模量和滞回阻尼比的影响,并在此基础上将桩周土体分成不同区域,求解了考虑非线性情况下土体动阻抗,通过传递矩阵法得到了大直径端承桩在分层土体中的桩-土振动模型,最后给出了桩底动阻抗的影响因素和变化规律。结果表明:考虑土体非线性时,塑性指数、桩周土体应变、桩土相对刚度、桩的长细比对大直径桩动阻抗的影响较大,在工程设计中应重点考虑。
In order to study the vertical vibration of large-diameter end-bearing pile in layered soils,we first modified the classical soil vibration model.Then the effects of plasticity index and the strain of soil around the pile on dynamic shear stress,shear modulus and hysteretic damping ratio of the soil were further studied.To solve the dynamic impedance of soil under nonlinear condition,soil around the pile was divided into different sections.The pile-soil vibration model of large diameter end bearing pile in layered soil was obtained by the transfer matrix method.Finally,the influencing factors and changing rules of dynamic impedance of pile bottom were obtained.The results showed that the plasticity index,strain of soil around the pile,pile-soil relative stiffness and slenderness ratio have great impacts on the dynamic impedance of the large diameter pile when the soil nonlinearity was considered,which should be considered in the engineering design.
作者
阮瑀
任青
喻孟初
RUAN Yu;REN Qing;YU Mengchu(Department of Civil Engineering,University of Shanghai far Science and Technology,Shanghai 200093,China;Yongzhou Lanshan County Traffic and Transportation Bureau,Yongzhou 425800,China)
出处
《水资源与水工程学报》
CSCD
2018年第6期214-222,共9页
Journal of Water Resources and Water Engineering
关键词
大直径端承桩
土体非线性
传递矩阵
竖向振动
large-diameter end-bearing pile
soil nonlinearity
transfer matrix
vertical vibration
