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在桩底有限土层采用虚土桩模型情况下,对桩底沉渣对非均质土中桩的动力特性的影响进行了研究。首先,将桩端正下方土体模拟为与桩端完全接触的虚土桩模型;然后,对桩侧土采用多圈层平面应变模型,并考虑其径向非均匀性,利用剪切复刚度传递的方法,递推得到了桩侧土作用在桩身的剪切复刚度,结合得到的剪切复刚度,利用阻抗函数递推方法,递推得到虚土桩顶部纵向振动复刚度,将其作为实际桩底的支撑刚度,求解桩顶频域和时域动力响应函数表达式;分析了桩底沉渣特性对桩的纵向振动特性的影响,得到了桩底沉渣对桩基纵向振动响应影响的规律性。最后,利用本文解对工程桩低应变反射波法实测曲线进行了反演拟合分析。
Under the condition that the soil-pile model is used in the limited soil layer, the influence of pile bottom sediment on the dynamic characteristics of pile in heterogeneous soil is studied. First, the soil beneath the pile tip is modeled as a model of soil-soil pile with full contact with the pile tip. Then, a multi-layer plane strain model is applied to the pile side soil, and considering the radial inhomogeneity, , The shear complex stiffness of the pile side soil acting on the pile body is obtained by recursion and the shear stiffness of the pile body is obtained by recursion. The complex stiffness of the longitudinal vibration at the top of the soil-pile is recursively obtained using the recursive method of impedance function. The actual stiffness of the pile bottom, solving the expression of dynamic response function in pile top frequency domain and time domain; analyzing the influence of pile bottom sediment characteristics on longitudinal vibration characteristics of pile, and obtaining the rule that the pile bottom sediment affects the longitudinal vibration response of pile foundation Sex. Finally, the measured curve of the low-strain reflected wave method of engineering pile is inverted and fitted by using this paper.