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阮 瑀, 任 青, 喻孟初.考虑土体非线性时大直径端承桩竖向振动研究水资源与水工程学报[J].,2018,29(6):214-222
考虑土体非线性时大直径端承桩竖向振动研究
Research on vertical vibration of large-diameter end-bearing pile considering soil nonlinearity
  
DOI:10.11705/j.issn.1672-643X.2018.06.33
中文关键词:  大直径端承桩  土体非线性  传递矩阵  竖向振动
英文关键词:large-diameter end-bearing pile  soil nonlinearity  transfer matrix  vertical vibration
基金项目:
作者单位
阮 瑀1, 任 青1, 喻孟初2 (1.上海理工大学 土木工程系 上海 200093
2.永州市蓝山县交通运输局 湖南 永州 425800) 
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中文摘要:
      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。
英文摘要:
      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.
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