根据波动力学的基本方程和无限平面内圆孔辐射应力混合边值问题的计算理论，利用傅立叶展开法，求解出在水平简谐荷载作用下，考虑桩与周围土体部分脱开的物理现象时桩周土的动刚度和动阻尼。之后将其应用到Novak的无限薄层理论中，得到了在水平简谐荷载作用下单桩的动刚度、动阻尼以及桩的水平振动幅值随频率的变化曲线。分析可知，在水平振动荷载作用下，桩的水平动刚度较小，水平位移起主导作用；考虑了桩与周围土体局部分离的物理现象后，计算出的桩顶水平振动幅值和频率比较稳定，其结果更接近于试验值；计算时，土体的剪切模量采用由静态试验法测得的桩顶土剪切模量，计算结果与试验值更接近。
Abstract
Based on the theory of elastic wave propagation and the mixed boundary problem of radiant stress of circular, the dynamic stiffness and damping of soil around the pile under horizontal harmonic loads can be calculated by using Fourier expansion method, when considering the effect of pile partially separated from soils. Then by applying it to the infinitely thin horizontal layers theory of Novak, the stiffness and damping of the pile and the vibration amplitude level of the pile with the frequency curve are obtained. It is shown that, in the horizontal vibration loads, the dynamic stiffness of pile is smaller than other stiffness, and the horizontal displacement plays an important role in all displacement. The calculated results considering the influence of pile-soil partial separation are less than that of the other literature, which assumed the bonding of the pile with the soil, and are in good agreement with experiments. The calculated results are closer to the test values when the shear modulus of soils is measured by the static test.
关键词
水平振动 /
动力特性 /
动刚度和动阻尼 /
共振峰值 /
共振频率 /
剪切模量
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Key words
horizontal vibration /
dynamic characteristics /
dynamic stiffness and damping /
resonance peak value /
resonance frequency /
shear modulus
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参考文献
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